Showing 7 items
matching light's intensity
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Federation University Historical Collection
Scientific Instrument, Spectrometer
... light's intensity.... The variable measured is most often the light's intensity but could... is most often the light's intensity but could also, for instance ...An optical instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials. The variable measured is most often the light's intensity but could also, for instance, be the polarization state. Often used in astronomy and some branches of chemistry.Electrostatic spectrometer in wooden box. Measured in Kilovolts.Serial number 108 MCCES 1942 FGspectrometer, scientific instrument, electromagnetic spectrum, light's intensity, astronomy, optical instrument -
Glenelg Shire Council Cultural Collection
Functional object - Lamp - Navigation light, acetylene type, c. 1980
... light intensity detector. Bronze body, painted red, glass lens..., acetylene type. Automatic swtich using light intensity detector ...Used as channel lights, Corio Bay channel. Bob Hodgson purchased light from Geelong Harbour Trust c. 1980, purchasing four for $20.00.Navigation light, acetylene type. Automatic swtich using light intensity detector. Bronze body, painted red, glass lens cover, dioptric lens with red chimney. Brass hinged chimney. Toggle latch. Light-senstiive switch mounted on side.Front: LIDINGO A.G.A. SWEDEN Back: (no inscriptions) -
Warrnambool and District Historical Society Inc.
Lamp, Ruby glass kerosene lamp, Early 20th century
... for regulating the light intensity. There is more brass between the bowl... for regulating the light intensity. There is more brass between the bowl ...There is no known history attached to this item. Lamps such as this one were common household items in the 19th century and the first three decades of the 20th century until electrical lighting became common in most households. This item has no known local provenance but it is useful for display as an item that was common in households in the past. This item has a cast iron base in a pyramidal shape with the four sides having identical scrolls and star shapes. A piece of brass attaches the base to a violet-coloured bowl. The bowl contains a white wick. The brass wick holder has an external knob for regulating the light intensity. There is more brass between the bowl and the mantle which is made of plain glass. On the base of the lamp: ‘Rd. No. 207869’ history of warrnambool, social history, ruby glass kerosene lamp -
Wodonga & District Historical Society Inc
Domestic object - Kerosene Lamp, early 20th Century
... for regulating the light intensity. There is more brass between the bowl... for regulating the light intensity. There is more brass between the bowl ...Kerosene lamps were used as a main source of lighting throughout Australia prior to the supply of domestic electrical services. This was obviously later in many rural areas. This lamp was used in the home of Mrs. Laura Flower nee Sommer wife of Mr. Stanley Flower of Wodonga.This lamp is representative of the lamps used throughout Australia prior to the introduction of domestic electricity supplies. It was used in the home of a Wodonga resident.This item has a cast iron base in a pyramidal shape with the four sides having an identical leaf and flower design. A piece of brass attaches the base to a clear glass bowl. The bowl contains a white wick. The brass wick holder has an external knob for regulating the light intensity. There is more brass between the bowl and the mantle which is made of plain glass.Inside the base of the lamp: an Rd No which is uncleardomestic appliances, kerosene lamp -
Flagstaff Hill Maritime Museum and Village
Machine - Dioptric Apparatus, mid 19th century
... misconception that a lighthouse's light source changes the intensity... that a lighthouse's light source changes the intensity to create a light ...Before the introduction of electricity, lighthouses had a clockwork mechanism that caused the lens to rotate with a light source inside that was either powered by Kerosene or Colza oil. The mechanism consisted of a large weight attached by a cable through the centre of the lighthouse to the top where the cable wrapped around a barrel, drum or wheels that controlled the speed of the lights rotation by a clockwork mechanism. The keeper would crank the clockwork mechanism, which would lift the weight ready for the next cycle similar to an old grandfather clock mechanism. Once the weight lifted to its apex at the bottom of the first landing, the keeper would let it fall, which would pull on the cable, which would, in turn, operate a series of gears activating the rotation of the Fresnel optical lens, which would then rotate to create the lighthouse’s unique light speed of rotation characteristic. Creating a specific characteristic required a way to regulate the speed of the rotation, and was important as sailors could identify a particular light by its speed and time between flashes. The weight had to fall at a certain rate to create the proper rotation speed of the lens and a regulator within the mechanism accomplished this. History: From 1851, Chance Brothers became a major lighthouse engineering company, producing optical components, machinery, and other equipment for lighthouses around the world. James Timmins Chance pioneered placing lighthouse lamps inside a cage surrounded by Fresnel lenses to increase the available light output these cages, are known as optics and they revolutionised lighthouse design. Another important innovation from Chance Brothers was the introduction of rotating optics, allowing adjacent lighthouses to be distinguished from each other by the number of times per revolution the light flashes. The noted English physicist and engineer, John Hopkins invented this system while employed at Chance Brothers. Chance Brothers and Company was a glass works and originally based in Spon Lane, Smethwick, West Midlands England. The company became a leading glass manufacturer and a pioneer of British glass making technology. The Chance family originated in Bromsgrove as farmers and craftsmen before setting up a business in Smethwick near Birmingham in 1824. They took advantage of the skilled workers, canals and many other industrial advances taking place in the West Midlands at the time. Robert Lucas Chance (1782–1865), known as 'Lucas', bought the British Crown Glass Company's works in Spon Lane in 1824. The company specialised in making crown window glass, the company ran into difficulty and its survival was guaranteed in 1832 by investment from Chance's brother, William (1788 – 1856). William owned an iron factoring business in Great Charles Street, Birmingham. After a previous partnership that Lucas had dissolved in 1836, Lucas and William Chance became partners in the business which was renamed, Chance Brothers and Company. Chance Brothers invented many innovative processes and became known as the greatest glass manufacturer in Britain. In 1848 under the supervision of Georges Bontemps, a French glass maker from Choosy-le-Roi, a new plant was set up to manufacture crown and flint glass for lighthouse optics, telescopes and cameras. Bontemps agreed to share his processes that up to then had been secret with the Chance Brothers and stayed in England to collaborate with them for six years. In 1900 a baronetcy was created for James Timmins Chance (1814–1902), a grandson of William Chance, who had started the family business in 1771 with his brother Robert. Roberts grandson, James became head of Chance Brothers until his retirement in 1889 when the company became a public company and its name changed to Chance Brothers & Co. Ltd. Additional information: Lighthouses are equipped with unique light characteristic or flashing pattern that sailors can use to identify specific lighthouses during the night. Lighthouses can achieve distinctive light characteristics in a few different ways. A lighthouse can flash, which is when brief periods of light interrupt longer moments of darkness. The light can occult, which is when brief periods of darkness interrupt longer moments of light. The light can be fixed, which is when the light never goes dark. A lighthouse can use a combination of flashing, oscillating, or being fixed in a variety of combinations and intervals to create individual light characteristics. It is a common misconception that a lighthouse's light source changes the intensity to create a light characteristic. The light source remains constant and the rotating Fresnel lens creates the various changes in appearance. Some Fresnel lenses have "bulls-eye" panels create beams of light that, when rotated between the light and the observer, make the light appear to flash. Conversely, some lenses have metal panels that, when rotated between the light and the observer, make the light appear to go dark. This Dioptric clockwork apparatus used to turn a lighthouse optical lens is very significant as it is integral to a lighthouses operation, we can also look at the social aspect of lighthouses as being traditionally rich with symbolism and conceptual meanings. Lighthouses illustrate social concepts such as danger, risk, adversity, challenge and vigilance but they also offers guidance, salvation and safety. The glowing lamp reminds sailors that security and home are well within reach, they also symbolize the way forward and help in navigating our way through rough waters not just on the oceans of the world but in our personal lives be it financial, personal, business or spiritual in nature. Nothing else speaks of safety and security in the face of adversity and challenge quite the way a lighthouse does. Revolving dioptric clockwork apparatus used to turn a Fresnel optical lighthouse lens. A cylindrical cast metal pillar and cabinet painted green with 3 glass doors enclosing the top section. Inside the pillar/cabinet is a large clockwork mechanism used to turn and regulate a lighthouse light by means of weights and a chain attached to same. One door has the name "Adams Mare" in metallic dots similar to "Braille" to the inside edge of door frame.shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, flagstaff hill, maritime-museum, shipwreck-coast, warrnambool, flagstaff-hill-maritime-village, revolving dioptric mechanism, dioptric mechanism for lighthouse, lighthouse clockwork timing mechanism, acetylene lighthouse light mechanism, 19th century lighthouse mechanism, kerosene light, fresnel lenses, colza oil, chance brothers -
Flagstaff Hill Maritime Museum and Village
Functional object - Light Fitting, c. 1878
... or change the intensity of the light. This light fitting was once... for lighting the candles or change the intensity of the light ...This light hanging mechanism could have been used for an adjustable chandelier with candle holders. It would likely be attached to the ceiling by its long stem to suspend the light fitting. A chain would have been threaded around each pulley, with one end joined to the top of the light fitting and the other end joined to a counter weight. The four counter weights would allow the light fitting to be raised or lowered to the desired height with little effort, to allow for lighting the candles or change the intensity of the light. This light fitting was once installed on the famous sailing ship, the Loch Ard, which was built in 1873 and tragically wrecked in 1878.The fitting was recovered from the wreck almost 100 years later, at the time it was discovered. LOCH ARD 1873-1878 – The Scottish-built clipper ship Loch Ard was bound for Melbourne in 1878 with 54 people on board. The mixed cargo it carried included items for the 1880 International Exhibition in Melbourne, one of which was the now famous Majorca ware Minton ‘Peacock’ statue. The Loch Ard was wrecked on June 1st when the ship crashed into Mutton Bird Island, east of Port Campbell. The only survivors were Tom Pearce, a crew member, and Eva Carmichael, a young passenger who was rescued by Pearce. The Gibsons, owners of nearby Glenample Homestead, cared for Tom, and for Eva who stayed longer before returning to Ireland. The wreck of the Loch Ard was discovered in 1967, before the introduction of the Victorian historic shipwreck legislation. In 1969 it was decided that all recovered material should be lodged with the Receiver of Wrecks. In 1980 Flagstaff Hill Maritime Museum Divers received a permit to recover artefacts from the wreck to safeguard them from looters. In 1982 the site was listed as a Historic Shipwreck, and the Maritime Archaeology Unit recovered loose artefact material. The light fitting is recognised as being historically significant as an example of lighting either as part of the ship ‘Loch Ard’ or part of the ship’s cargo, imported for use in Colonial Victoria in the 19th to early 20th century. Flagstaff Hill’s collection of artefacts from LOCH ARD is significant for being one of the largest collections of artefacts from this shipwreck in Victoria. It is significant for its association with the shipwreck, which is on the Victorian Heritage Register (VHR S417). The collection is significant because of the relationship between the objects, as together they have a high potential to interpret the story of the LOCH ARD. The LOCH ARD collection is archaeologically significant as the remains of a large international passenger and cargo ship. The LOCH ARD collection is historically significant for representing aspects of Victoria’s shipping history and its potential to interpret sub-theme 1.5 of Victoria’s Framework of Historical Themes (living with natural processes). The collection is also historically significant for its association with the LOCH ARD, which was one of the worst and best known shipwrecks in Victoria’s history. Light fitting; hanging mechanism with simple pulley wheels for pendant light. Metal pipe, closed and hooked at one end, stem has three decorative rings, and open end has a short narrower metal pipe inserted. Narrow pipe has a three tiered, scallop-edged dome attached to the end. The dome encloses remnants of broken chain length and is attached to a set of four pulley wheels arrayed in a circle with their edge sat right angles to each other. The light fitting was recovered from the wreck of the Loch Ard.flagstaff hill, warrnambool, shipwrecked coast, flagstaff hill maritime museum, maritime museum, shipwreck coast, flagstaff hill maritime village, great ocean road, shipwreck artefact, loch ard, victoria, eva carmichael, tom pearce, lighting, lidht fitting, pendant light, chandelier, pulley light, adjustable height light -
Kew Historical Society Inc
Decorative object - Wallpaper sample from 'Reno', St John's Parade, 1850-1880
Comparatively few weatherboard houses in Kew survived from the early years of settlement into the second half of the 20th century. One such property was ‘Reno’, which once stood on the east side of St John’s Parade. Its earliest recorded owner was the architect Samuel Cocking who lived there from c.1865 until his death in 1888. The original landholding was bordered by Cotham Road, Glenferrie Road, Wellington Street, and Charles Street. The southern portion of this land included a fine orchard, with many imported trees. The old summer house, at first in the orchard, was later removed to the house garden. The MMBW Detail Plan No.1576 (1904) shows the remaining portion of the original land holding, including a semi-circular pathway at the front, and garden features such as an aviary, a fountain and grotto, and a fernery. None of these are apparent in photographs dating from the 1960s, where the garden, which once included rare plants provided by Baron Von Mueller, surrounds the cottage in a tangled frenzy. Despite a ‘local significance’ classification by the National Trust, the house was demolished in 1977.Original sample of nineteenth century wallpaper from one of the earliest homes in Kew (Victoria).Wallpaper fragment from ‘Reno’. These two samples of light brown Victorian-period wallpaper were overprinted with flowers and leaves that are outlined in maroon. Flowers and foliage are painted in blue of varying intensity, giving the impression of being hand painted. The style of this wallpaper would have been suited to a bedroom or drawing room.wallpaper, samuel cocking, reno, st john's parade, kew