Showing 9 items
matching echo sounding
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Queenscliffe Maritime Museum
Instrument - Echo Roll Reader
... Echo Sounding...-and-the-bellarine-peninsula Echo Sounding Hydrography A hand driven echo ...A hand driven echo roller reader.echo sounding, hydrography -
Flagstaff Hill Maritime Museum and Village
Parallel Rule, 1947-1955
... recording echo sounder and in 1935 a controlling interest... produced its first recording echo sounder and in 1935 a controlling ...History/Context: In 1947, the scientific instrument manufacturing firms of Henry Hughes & Son Ltd, London, England, and Kelvin Bottomley & Baird Ltd, Glasgow, Scotland, came together to form Kelvin & Hughes Ltd. Hughes Company History: Henry Hughes & Sons were founded in 1838 in London as a maker of chronographic and scientific instruments. The firm was incorporated as “Henry Hughes & Sons Ltd” in 1903. In 1923, the company produced its first recording echo sounder and in 1935 a controlling interest in the company was acquired by S Smith & Son Ltd resulting in the development and production of marine and aircraft instruments. Following the London office's destruction in the Blitz of 1941, a collaboration was entered into with Kelvin, Bottomley & Baird Ltd resulting in the establishing “Marine Instruments Ltd”. Following the formal amalgamation of Kelvin, Bottomley & Baird Ltd and Henry Hughes & Sons Ltd in 1947 to form Kelvin & Hughes Ltd. Marine Instruments Ltd then acted as regional agents in the UK for Kelvin & Hughes Ltd who were essentially now a part of Smith's Industries Ltd founded in 1944 and the successors of S. Smith & Son Ltd. Kelvin & Hughes Ltd went on to develop various marine radar and echo sounders supplying the Ministry of Transport, and later the Ministry of Defence. The firm was liquidated in 1966 but the name was continued as Kelvin Hughes, a division of the Smiths Group. In 2002, Kelvin Hughes continues to produce and develop marine instruments for commercial and military use. (See Note section this document for further information on the company's origins)This model parallel map ruler is a good example of the commercial diversity of navigational instruments made by Kelvin & Hughes after world war 2. It was made in numbers for use by shipping after the second world war and is not particularly rare or significant for its type. Also, it was made no earlier than 1947 as the firms of Kelvin, Bottomley & Baird Ltd and Henry Hughes & Sons Ltd who took over from Smith & Sons were not amalgamated until 1947. It can there for be assumed that this ruler was made during the company's transitional period to Kelvin & Hughes from Smith Industries Ltd.Metal parallel rule with Kelvin & Hughes Ltd, Made in Great Britain imprinted, numerous measurements, two handles and 3 hinges.flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, parallel rule, kelbin & hughes ltd, metal parallel rule -
Flagstaff Hill Maritime Museum and Village
Functional object - Binnacle and Magnetic Compass
... recording echo sounder and in 1935 a controlling interest... recording echo sounder and in 1935 a controlling interest ...In 1947, the scientific instrument manufacturing firms of Henry Hughes & Son Ltd, London, England, and Kelvin Bottomley & Baird Ltd, Glasgow, Scotland, came together to form Kelvin & Hughes Ltd. Hughes Company History: Henry Hughes & Sons were founded in 1838 in London as a maker of chronographic and scientific instruments. The firm was incorporated as “Henry Hughes & Sons Ltd” in 1903. In 1923, the company produced its first recording echo sounder and in 1935 a controlling interest in the company was acquired by S Smith & Son Ltd resulting in the development and production of marine and aircraft instruments. Following the London office's destruction in the Blitz of 1941, a collaboration was entered into with Kelvin, Bottomley & Baird Ltd resulting in the establishing “Marine Instruments Ltd”. Following the formal amalgamation of Kelvin, Bottomley & Baird Ltd and Henry Hughes & Sons Ltd in 1947 to form Kelvin & Hughes Ltd. Marine Instruments Ltd then acted as regional agents in the UK for Kelvin & Hughes Ltd who were essentially now a part of Smith's Industries Ltd founded in 1944 and the successors of S. Smith & Son Ltd. Kelvin & Hughes Ltd went on to develop various marine radar and echo sounders supplying the Ministry of Transport, and later the Ministry of Defence. The firm was liquidated in 1966 but the name was continued as Kelvin Hughes, a division of the Smiths Group. In 2002, Kelvin Hughes continues to produce and develop marine instruments for commercial and military use. (See Note section this document for further information on the company's origins) This model binnacle and compass is a good example of the commercial diversity of navigational instruments made by Kelvin & Hughes after world war 2. It was made in numbers for use by shipping after the second world war and is not particularly rare or significant for its type. Also, it was made no earlier than 1947 as the firms of Kelvin, Bottomley & Baird Ltd and Henry Hughes & Sons Ltd who took over from Smith & Sons were not amalgamated until 1947. It can there for be assumed that this item was made during the company's transitional period to Kelvin & Hughes from Smith Industries Ltd.Mid 20th century ship's binnacle with Kelvin Hughes/ F. Fuselli Genova 8 inch diameter (glass) compass on gimballed ring. Round, teak wood pedestal with mounted brass compensating sphere brackets and painted iron balls one green the other red. Heavy brass helmet style compass cover with hinged front door and removable top for compass viewing and natural lighting. A single handle is located on the side and single burner on the opposite side. Retains an old finish and some wear to the pedestal base. Binnacle marked Serial No 163 "Veritas" Made by Kelvin Hughes Compass marked "Kelvin Hughes & Made in Great Britain Serial No 760 C J"flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village -
The Beechworth Burke Museum
Audio - Oral History, Jennifer Williams, Dr Roy Phillips, 8th October 2000 (exact date unclear)
... ' (an echo-sounding point over a nearby gully) which he states...' (an echo-sounding point over a nearby gully) which he states ...Roy Phillips was born in 1907 in Yackandandah and moved with his family to Beechworth when he was five years old. His father was involved in dredging operations at Lake Sambell but his parents also had other family living in Beechworth, with whom they lived. Dr Phillips tells vivid stories about life in Beechworth in the first half of the Twentieth Century, from the daily lives of young children of the time to the town's relationship to the local Chinese community. He discusses features of the landscape such as 'The Rock' at which community concerts were held and 'The Echo' (an echo-sounding point over a nearby gully) which he states are no longer used in the same way. He also discusses changing community attitudes to various issues, for example, 'not being coddled' as a child but living in a town with very strict rules about people of different religions mingling. This oral history recording was part of a project conducted by Jennifer Williams in the year 2000 to capture the everyday life and struggles in Beechworth during the twentieth century. This project involved recording seventy oral histories on cassette tapes of local Beechworth residents which were then published in a book titled: Listen to what they say: voices of twentieth century Beechworth. These cassette tapes were digitised in July 2021 with funds made available by the Friends of the Burke.Dr Roy Phillips' account of his life in Beechworth in the early part of the 20th Century is historically and socially significant to the cultural heritage of the region. He describes town life from a child's point of view during a time of transition to life after the Gold Rush era, including social tensions existing between cultural groups such as the Chinese community and European-heritage townspeople and between people of different religious groups in Beechworth. This oral history account is socially and historically significant as it is a part of a broader collection of interviews conducted by Jennifer Williams which were published in the book 'Listen to what they say: voices of twentieth-century Beechworth.' While the township of Beechworth is known for its history as a gold rush town, these accounts provide a unique insight into the day-to-day life of the town's residents during the 20th century, many of which will have now been lost if they had not been preserved.This is a digital copy of a recording that was originally captured on a cassette tape. The cassette tape is black with a horizontal white strip and is currently stored in a clear flat plastic rectangular container. It holds up 40 minutes of recordings on each side.Dr Roy Phillips /beechworth, yackandandah, wangaratta, mining, dredging, 1910s, 1920s, 1930s, chinese community, typhoid, lake kerferd, reminiscences, memories, childhood, lake sambell, alcoholism, new year celebrations, transport, horses, foresters lodge, oddfellows lodge, funeral practices, child-rearing practices, star hotel, the rock, racism, chinese dragon, benevolent society, star lane coach building factory, outdoor concerts, gold, jimmy ingram, kelly gang, kelly family, churches, catholic, methodist, protestant, anglican, confuscionist, buddhism, women's christian temperance association, hotels, twentieth century, coronation of king george iv, echo point, the echo, tippany cat, marbles, children's games, cornish, cornwall, listen to what they say, oral history -
Flagstaff Hill Maritime Museum and Village
Compass, 1947-1950
... . In 1923, the company produced its first recording echo sounder.... In 1923, the company produced its first recording echo sounder ...Kelvin Company History: The origins of the company lie in the highly successful, if strictly informal, the relationship between William Thomson (1824-1907), Professor of Natural Philosophy at Glasgow University from 1846-1899 and James White, a Glasgow optical maker. James White (1824-1884) founded the firm of James White, who was an optical instrument maker in Glasgow in 1850. He was involved in supplying and mending apparatus for Thomson's university laboratory and working with him on experimental constructions. White was actually declared bankrupt in August 1861 and released several months later. In 1870, White was largely responsible for equipping William Thomson's laboratory in the new University premises at Gilmore hill. From 1876, he was producing accurate compasses for metal ships to Thomson's design during this period and this became an important part of his business in the last years of his life. He was also involved in the production of sophisticated sounding machinery that Thomson had designed to address problems encountered laying cables at sea, helping to make possible the first transatlantic cable connection. At the same time, he continued to make a whole range of more conventional instruments such as telescopes, microscopes and surveying equipment. White's association with Thomson continued until he died. After his death, his business continued under the same name, being administered by Matthew Edwards (until 1891 when he left to set up his own company). Thomson, who became Sir William Thomson and then Baron Kelvin of Largs in 1892, continued to maintain his interest in the business after James White's death in 1884, raising most of the capital needed to construct and equip new workshops in Cambridge Street, Glasgow. At these premises, the company continued to make the compass Thomson had designed during the 1870s and to supply it in some quantity, especially to the Admiralty. At the same time, the firm became increasingly involved in the design, production and sale of electrical apparatus. In 1899, Lord Kelvin resigned from his University chair and became, in 1900, a director in the newly formed limited liability company Kelvin & James White Ltd which had acquired the business of James White. At the same time Kelvin's nephew, James Thomson Bottomley (1845-1926), joined the firm. In 1904, a London branch office was opened which by 1915 had become known as Kelvin, White & Hutton Ltd . Kelvin & James White Ltd underwent a further change of name in 1913, becoming Kelvin Bottomley & Baird Ltd . Hughes Company History: Henry Hughes & Sons was founded in 1838 in London as a maker of chronographic and scientific instruments. The firm was incorporated as Henry Hughes & Sons Ltd in 1903. In 1923, the company produced its first recording echo sounder and in 1935, a controlling interest in the company was acquired by S Smith & Son Ltd resulting in the development and production of marine and aircraft instruments. Following the London office's destruction in the Blitz of 1941, a collaboration was entered into with Kelvin, Bottomley & Baird Ltd resulting in the establishing Marine Instruments Ltd. Following the formal amalgamation of Kelvin, Bottomley & Baird Ltd and Henry Hughes & Sons Ltd in 1947 to form Kelvin & Hughes Ltd., Marine Instruments Ltd then acted as regional agents in the UK for Kelvin & Hughes Ltd who were essentially now a part of Smith's Industries Ltd founded in 1944 and the successors of S Smith & Son Ltd. Kelvin & Hughes Ltd went on to develop various marine radar and echo sounders supplying the Ministry of Transport, and later the Ministry of Defence. The firm was liquidated in 1966 but the name was continued as Kelvin Hughes, a division of the Smiths Group. In 2002, Kelvin Hughes continues to produce and develop marine instruments for commercial and military use. This model compass is a good example of the commercial type of instruments made by Kelvin & Hughes after the world war 2, it was made in numbers for use on various types of shipping after the second world war and is not particularly rare or significant for it's type. Also it was made no earlier than 1947 as the firms of Kelvin, Bottomley & Baird Ltd and Henry Hughes & Sons Ltd who took over from Smith & Sons were not amalgamated until 1947. Given that Smith and Sons is engraved on the compass with Kelvin & Hughes it can be assumed that this compass was made during the company's transitional period to Kelvin & Hughes.Compass, marine or ship's card compass, gimble mounted, with inscriptions. Type is Lord Kelvin 10 inch compass card. Made in Great Britain by Kelvin Hughes Division of S. Smith & Sons (England) Ltd. "LORD KELVIN 10.", "COMPASS GRID", "MANUFACTURED IN GREAT BRITAIN BY", "KELVIN HUGHES DIVISION", "S. Smith & Sons (England) Ltd".flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, marine compass, gimble compass, ship's compass, lord kelvin compass, smith and sons england ltd, henry hughes & son ltd london england, kelvin bottomley & baird ltd glasgow scotland, kelvin & hughes ltd, navigation instrument, scientific instrument, william thomson, james white, baron kelvin of largs -
Flagstaff Hill Maritime Museum and Village
Parallel Rule, 1947-1950
... . In 1923, the company produced its first recording echo sounder.... In 1923, the company produced its first recording echo sounder ...Navigators use parallel rule with maps and charts for plotting a specific course on a chart. One long edge is used with the compass rose on the chart, aligning the centre of the rose with the desired direction around the edge of the rose. The compass bars are then ‘walked’ in and out across the map to the desired location so that lines can be plotted to represent the direction to be travelled. Kelvin Company History: The origins of the company lie in the highly successful and strictly informal relationship between William Thomson (1824-1907), Professor of Natural Philosophy at Glasgow University from 1846-1899 and James White, a Glasgow optical maker. James White (1824-1884) founded the firm of James White, an optical instrument maker in Glasgow in 1850 and was involved in supplying and mending apparatus for Thomson university laboratory and working with him on experimental constructions. White was declared bankrupt in August 1861 and released several months later. In 1870, White was largely responsible for equipping William Thomson laboratory in the new University premises at Gilmore hill. From 1876, he was producing accurate compasses for metal ships to Thomson design during this period and this became an important part of his business in the last years of his life. He was also involved in the production of sophisticated sounding machinery that Thomson had designed to address problems encountered laying cables at sea, helping to make possible the first transatlantic cable connection. At the same time, he continued to make a whole range of more conventional instruments such as telescopes, microscopes and surveying equipment. White's association with Thomson continued until he died. After his death, his business continued under the same name, being administered by Matthew Edwards until 1891 when he left to set up his own company. Thomson who became Sir William Thomson and then Baron Kelvin of Largs in 1892, continued to maintain his interest in the business after James White's death in 1884, raising most of the capital needed to construct and equip new workshops in Cambridge Street, Glasgow. At these premises, the company continued to make the compass Thomson had designed during the 1870s and to supply it in some quantity, especially to the Admiralty. At the same time, the firm became increasingly involved in the design, production and sale of electrical apparatus. In 1899, Lord Kelvin resigned from his University chair and became, in 1900, a director in the newly formed limited liability company Kelvin & James White Ltd which had acquired the business of James White. At the same time Kelvin's nephew, James Thomson Bottomley (1845-1926), joined the firm. In 1904, a London branch office was opened which by 1915 had become known as Kelvin, White & Hutton Ltd. Kelvin & James White Ltd underwent a further change of name in 1913, becoming Kelvin Bottomley & Baird Ltd. Hughes Company History: Henry Hughes & Sons were founded in 1838 in London as a maker of chronographic and scientific instruments. The firm was incorporated as “Henry Hughes & Sons Ltd” in 1903. In 1923, the company produced its first recording echo sounder and in 1935 a controlling interest in the company was acquired by S Smith & Son Ltd resulting in the development and production of marine and aircraft instruments. Following the London office's destruction in the Blitz of 1941, a collaboration was entered into with Kelvin, Bottomley & Baird Ltd resulting in the establishing “Marine Instruments Ltd”. Following the formal amalgamation of Kelvin, Bottomley & Baird Ltd and Henry Hughes & Sons Ltd in 1947 to form Kelvin & Hughes Ltd. Marine Instruments Ltd then acted as regional agents in the UK for Kelvin & Hughes Ltd who were essentially now a part of Smith's Industries Ltd founded in 1944 and the successors of S Smith & Son Ltd. Kelvin & Hughes Ltd went on to develop various marine radar and echo sounders supplying the Ministry of Transport, and later the Ministry of Defence. The firm was liquidated in 1966 but the name was continued as Kelvin Hughes, a division of the Smiths Group. In 2002, Kelvin Hughes continues to produce and develop marine instruments for commercial and military. This model parallel map ruler is a good example of the commercial diversity of navigational instruments made by Kelvin & Hughes after World War II. It was made in numbers for use by shipping after the second world war and is not particularly rare or significant for it's type. Also it was made no earlier than 1947 as the firms of Kelvin, Bottomley & Baird Ltd and Henry Hughes & Sons Ltd who took over from Smith & Sons were not amalgamated until 1947. It can therefor be assumed that this ruler was made during the company's transitional period to Kelvin & Hughes from Smith Industries Ltd.Brass parallel rule in wooden box with blue felt lining.Rule inscribed on front "Kelvin & Hughes Ltd" " Made in Great Britain"flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, parallel rule, kelvin & hughes ltd, map ruler, plot direction, navigation, maps, echo sounder, kelvin & james white, lord kelvin, baron kelvin of largs, scientific instrument -
Flagstaff Hill Maritime Museum and Village
Instrument - Sextant, Late 20th Century
... . In 1923, the company produced its first recording echo sounder.... In 1923, the company produced its first recording echo sounder ...In 1941, the scientific instrument manufacturing firms of Henry Hughes & Son Ltd, London, England, and Kelvin Bottomley & Baird Ltd, Glasgow, Scotland, came together to form Kelvin & Hughes Ltd. Kelvin Company History: The origins of the company lie in the highly successful and strictly informal relationship between William Thomson (1824-1907), Professor of Natural Philosophy at Glasgow University from 1846-1899 and James White, a Glasgow optical maker. James White (1824-1884) founded the firm of James White, an optical instrument maker in Glasgow in 1850 and was involved in supplying and mending apparatus for Thomson university laboratory and working with him on experimental constructions. White was declared bankrupt in August 1861 and released several months later. In 1870, White was largely responsible for equipping William Thomson laboratory in the new University premises at Gilmore hill. From 1876, he was producing accurate compasses for metal ships to Thomson design during this period and this became an important part of his business in the last years of his life. He was also involved in the production of sophisticated-sounding machinery that Thomson had designed to address problems encountered laying cables at sea, helping to make possible the first transatlantic cable connection. At the same time, he continued to make a whole range of more conventional instruments such as telescopes, microscopes and surveying equipment. White's association with Thomson continued until he died. After his death, his business continued under the same name, being administered by Matthew Edwards (until 1891 when he left to set up his own company. Thomson who became Sir William Thomson and then Baron Kelvin of Largs in 1892, continued to maintain his interest in the business after James White's death. In 1884 raising most of the capital needed to construct and equip new workshops in Cambridge Street, Glasgow. At these premises, the company continued to make the compass Thomson had designed during the 1870s and to supply it in some quantity, especially to the Admiralty. At the same time, the firm became increasingly involved in the design, production and sale of electrical apparatus. In 1899, Lord Kelvin resigned from his University chair and became, in 1900, a director in the newly formed limited liability company Kelvin & James White Ltd which had acquired the business of James White. At the same time Kelvin's nephew, James Thomson Bottomley (1845-1926), joined the firm. In 1904, a London branch office was opened which by 1915 had become known as Kelvin, White & Hutton Ltd. Kelvin & James White Ltd underwent a further change of name in 1913, becoming Kelvin Bottomley & Baird Ltd. Hughes Company History: Henry Hughes & Sons were founded in 1838 in London as a maker of chronographic and scientific instruments. The firm was incorporated as “Henry Hughes & Sons Ltd” in 1903. In 1923, the company produced its first recording echo sounder and in 1935 a controlling interest in the company was acquired by S Smith & Son Ltd resulting in the development and production of marine and aircraft instruments. Following the London office's destruction in the Blitz of 1941, a collaboration was entered into with Kelvin, Bottomley & Baird Ltd resulting in the establishing “Marine Instruments Ltd”. Following the formal amalgamation of Kelvin, Bottomley & Baird Ltd and Henry Hughes & Sons Ltd in 1947 to form Kelvin & Hughes Ltd. Marine Instruments Ltd then acted as regional agents in the UK for Kelvin & Hughes Ltd who were essentially now a part of Smith's Industries Ltd founded in 1944 and the successors of S. Smith & Son Ltd. Kelvin & Hughes Ltd went on to develop various marine radar and echo sounders supplying the Ministry of Transport, and later the Ministry of Defence. The firm was liquidated in 1966 but the name was continued as Kelvin Hughes, a division of the Smiths Group. In 2002, Kelvin Hughes continues to produce and develop marine instruments for commercial and military. G. Falconer Company History: G Falconer (Hong Kong Ltd) appear to have had a retail presence in Hong Kong since 1885, according to the company website, and currently have a shop in the Peninsula Hotel. G Falconer was the Hong Kong selling agent for several British companies. Ross Ltd of 111 New Bond St London was one and the other was Kelvins Nautical Instruments. Falconers were primarily watchmakers, jewellers and diamond merchants.They were also agents for Admiralty Charts, Ross binoculars and telescopes, and sold English Silverware and High Class English Jewellery. In 1928 the company was operating from the Union Building opposite the Hong Kong general post office. It is unclear if the item is an original Sextant made by Kelvin prior to his amalgamation with Henry Hughes & Sons in 1941 as Kelvin appears to have only made compasses up to this date. If the Sextant can be established that it was made by Kelvin then it is very significant and a rare item made for and distributed through their Hong Kong selling agents G Falconer Ltd. There are many Sextants advertised for sale stating "Kelvin & Hughes 1917 model sextant". These can be regarded as replicas as the company was not formed until 1941 and production of marine instruments was not fully under way until after the war in 1947. Further investigation needs to be undertaken to accurately determine the provenance of this item. As the writer currently has the impression that the subject object was possibly made by Kelvin and Hughes in the mid to late 20th century or is a replica made by an unknown maker in the late 1970s. Purchased as an exhibition of marine navigational instruments for the Flagstaff Hill museum. The Sextant is a brass apparatus with filters and telescope lens, and comes with a wooden felt lined storage box. It is a doubly reflecting navigation instrument that measures the angular distance between two visible objects. The primary use of a sextant is to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation.G Falconer and Co. Hong Kong (retailers of nautical equipmentflagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, sextant, kelvin & hughes ltd, hong kong, navigational instrument, g falconer, mariner's quadrants -
Federation University Historical Collection
Magazine - Booklet, Baxter & Stubbs, Print, Ballarat School of Mines Students' Magazine, 1923, 1923
Editorial, In Memoriam: Robert James Dowling, Fumes from the Lab, A trip to America, Arts & Crafts Gossip, Echoes of the Past, Sport, The Junior Techs. Under Arts & Crafts Gossip the writer gives on overview on 'modern books on fine art'. "... In making this decision as to whether his tone values are correct or not the artist always studies his canvas from a distance of several yards. An excellent system of painting is being practised and taught by Max Meldrum. This consists of painting in the orders of the impressions. This method is fully explained in his book, and will be found invaluable by the student desiring to work on sound lines. ...Brown soft covered magazine..1) Stamped "Ballarat Technical Art School" .2) Written on front cover "Hessie Darby"ballarat school of mines, magazine, hessie darby, ballarat technical art school, e. kift, ethel kift, r. t. crosthwaite, c. mcilvena, h. finlayson, e. mckissock, f. russell, c. s. hunt, j. r. pound, a. leask, m. timmings, professor alfred mica smith, robert james dowling, e. j. mcconnon, r. g. cox, edwin a. brophy, raymond fricke, nancy humphries, r. sage, max meldrum -
Lakes Entrance Regional Historical Society (operating as Lakes Entrance History Centre & Museum)
Equipment - Asdic Echo Sounder
... Equipment Asdic Echo Sounder ...First fish finder used in Australia. This technology was developed by the British during WW2 to detect submarinesHistoricalFirst fish finder in Australia - installed on boat 'Maasbanker' in 1968. Simrad SK3 Asdic Soundermaritime technology, fisheries