An induction coil consists of two coils of insulated copper wire wound around a common iron core. One coil, called the primary winding, is made from relatively few (tens or hundreds) turns of coarse wire. The other coil, the secondary winding, typically consists of many (thousands) turns of fine wire. An electric current is passed through the primary, creating a magnetic field. Because of the common core, most of the primary's magnetic field couples with the secondary winding. The primary behaves as an inductor, storing energy in the associated magnetic field. When the primary current is suddenly interrupted, the magnetic field rapidly collapses. This causes a high voltage pulse to be developed across the secondary terminals through electromagnetic induction. Because of the large number of turns in the secondary coil, the secondary voltage pulse is typically many thousands of volts. This voltage is often sufficient to cause an electric spark, to jump across an air gap separating the secondary's output terminals. For this reason, induction coils were called spark coils. The size of induction coils was usually specified by the length of spark it could produce; an '8 inch' (20 cm) induction coil was one that could produce an 8 inch arc. (http://en.wikipedia.org/wiki/Induction_coil)A metal and plastic object on a timber stand. In an induction coil the distance between the plates is often used to measure the voltage of the spark since the air breaks down at 30 000 volts per centimetreballarat college of advanced education, scientific instrument, induction coil, scientific instruments, electricity

http://www.measurement.gov.au/Publications/CertificateOfApproval/WeighingInstruments/Balances/Documents/6-1-120081111102335.pdfSmall pan scale/beam balance Black base on three legs, silver pansGriffin & George Limited London (winged griffen emblem) Birmingham Manchester - Glasgow - Edinburgh Made in Englandbalance, griffen, george, bakelite, steel, pans, assaying, scientific instruments

Used at the Ballarat School of Mines Petrology classes. Probably a second generation petrological microscope used at SMB. Earlier reference ; to " Petrological Microscope" is made in SMB 1908 - 9 calendar page 35. Reference to "Mineral Microscopy" found in calendar for 1896, page 47. Petrographic Microscope with two-lens objective turret in a timber case. The microscope black enameled frame with brass components. Housed in a polished wood case. Three additional polarizing filters in accessory drawer. "E. Leitz Wetzlar No. 139041 Made for Kilpatrick & Co Melbourne" A removable label inside storage case door, dated "I.II.1912" and stating the obtainable magnification ratios.ballarat school of mines, geology, petrography, microscope, scientific objects, scientific instruments

According to Max Clarke this item was used by the surveying classes at the Ballarat School of MinesA boxed (timber) theodolite with crossbars and full-length stadia wires. The theodolite can be mounted on a metal straightedge base. The box also contains a magnetic compass with two bubble levels, a plumbing folk, and 4 brass paper clips designed to suit a plan table. On box in black paint "A 1". Inside box lid is manufacturer's label and Stadia measurement zero reference calibration.ballarat school of mines, surveying equipment, gurley, max clarke, theodolite, stadia measurement, calibration, scientific instrument

Probably used at the Ballarat School of Mines. It indicates the percentage of relative humidity .A circular dial with non-linear graduations and centre-pivot pointer. it is mounted in a brass case, with rear mounting flange. The markings on the Hygrometer at Very Dry, Dry, Normal, Moist. It has a crescent moon dial indicatorballarat school of mines, meteorology, weather, scientific instruments, scientific objects, hygrometer, relative humidity

This item is possibly the sextant donated to the Ballarat School of Mines Museum on 21 October 1885 by D. Turpie of Ballarat.Timber (ebony?) framed sextant with ivory scale, brass radial arm and ivory vernier scale. Mirrors and viewer are set in brass.Maker's label inside the hinged lid.sextant, scientific instrument, d. turpie, navigation, ballarat school of mines museum

This microscope is thought to be one of the earliest 'mineral microscopes' obtained by the Ballarat School of Mines. See reference in SMB Calendar 1896, p47, also Ballarat SChool of Mines Calendar 1908-9, p35 - "petrological microscope".Black-finished brass microscope and brass stage. Includes adjustment knobs, lens mounts,three objective lenses and two eyepiece lenses of same rating. The microscope is boxed in a timber storage case, hinged at the front with a brass handle on top. Model: London, Ser.no. 26791Engraved on rear of base frame "R. & J. BECK Ltd LONDON 26791"petrographic microscope, microscope, petrology, ballarat school of mines, school of mines ballarat, mineral microscope, laboratory, r. & j. beck ltd

A quadrant mounted telescope with crosshairs and external focussing, with longitudinal bubble level. Mountable on a magnetic compass plate with two bubble levels. Complete with dapered-spigot base plate and slot view attachments, Housed in a polished timber box. Inside the box are two labels -A label on the inside of the box " to the School of Mines and Industries, Ballarat" To (...) Hoadley, Esq, Principal, Footscray Technical school, Footscray WII" "Sluggish Needle, 9/4/3..." "still sluggisg 1966"mining, ballarat school of mines, surveying, archibald hoadley, scientific equipment, circumferential, scientific instruments

Around 1900 the Ballarat School of Mines had an international reputation. it is thought that that this photograph was originally taken by the New South Wales Mines Department during a visit to Victoria. This photograph was reproduced in the Ballarat School of Mines Annual Report 1900 This image is now (2012) used as Founders' Room in the Ballarat School of Mines Administration Building. Black and white photograph on green mountboard. It shows three men in a Ballarat School of Mines laboratory surrounded by chemicals and scientific equipment.Written on lower mount "Analytical Lab. S.M.B. Mines Deptmining, ballarat school of mines, chemistry, laboratory, scientific objects, scientific instruments, analytical laboratory, administration building, a building, founders room

The author, Bennett H. Brough was an associate of theRoyal School of Mines, a member of the COuncil of the Institution of Mining Engineers, a fellow of the geological society and of the Institute of Chemistry, a member of the Mining Institute of Cornwall, and a former instructor of mine-surveying at the Royal School of MinesRed had covered book 372 pages - part of Griffin's Mining Series. Contents include general explanatinos of surveying, an historical sketch, mineral deposits, mining terms, measures of length, measurement distances, the chain, rods, steel bands, measuring wheel, Miner's Dial, Magnetic needle, Fixed needle, German Dial, theodolite, traversing underground. Surface-surveys. plotting the survey, calculation of area, leveling, Telescope, Setting out, Mine-Surveying Problems, Mine Plans, Photographic Surveying, examination Surveying. Illustrations include: Whitelaw's Dial (Fig 22), Theodolite of the American Type with Hoffman tripod head, (fig 37a)mining, surveying, miner's dial, chain, survey, theodolite, scientific instruments

Nobel Industries Limited was founded in 1870 by Swedish chemist and industrialist Alfred Nobel for the production of the new explosive dynamite in the United Kingdom. Ardeer, on the coast at Ayrshire, was chosen for the company's first factory. Between 1877 amd 1926 it was known as Nobel’s Explosives Company Limited. The business later diversified into the production of blasting gelatine, gelignite, ballistite, guncotton, and cordite. At its peak, the factory employed nearly 13,000 men and women. In 1926, the firm merged with Brunner, Mond & Company, the United Alkali Company, and the British Dyestuffs Corporation, creating a new group, Imperial Chemical Industries, then one of Britain's largest firms. Nobel Industries continued as the ICI Nobel division of the company. Small black timber box with small screw holding back on, and leather handle on top. A pivoted needle remains vertical as box angle changes. Graded scale behing top end of needle. Two adjusting points at top.No 10070nobel, ballarat school of mines, scientific instruments, galvanometer

The Ballarat School of Mines was the first site of Technical Education in Australia. Initially it opened in 1870 and educated miners. Black and white photograph of the interior of the Ballarat School of Mines Physics Laboratory. Numerous pieces of equipment sit on benches. The image in the 1908 Ballarat School of Mines Calendar was title 'Physics Demonstration Room'.ballarat school of mines, laboratory, physics, scientific instruments, science, classroom, education

The Weston cell, is a wet-chemical cell that produces a highly stable voltage suitable as a laboratory standard for calibration of voltmeters. Invented by Edward Weston in 1893, it was adopted as the International Standard for EMF between 1911 and 1990.[1] This is a type of standard cell, which is a battery that produces a precisely known voltage in laboratory conditions at 20 degrees centigrade.[2]Brass cylinder with 4 connections at top. Two marked 'A' and the other two marked 'B'. Black plastic nob in the centre top. Written at top Weston Normal Cell I-0183 INT VOLTS AT 20 degrees CWeston Normal Cell H Tinsley & Co, London S E No 50498 No 8910weston cell, wet-chemical cell, stable voltage, voltmeters, edward weston, scientific instrument

Grey metal rectangular box with 3 large dials down centre and 3 terminals at one end Dials show different levels - capacitiesMaker's plate: Techtron - Techtron Appliances - Melbourne - Australia Type: R3D1 Serial: 101resistance control box, terminals, ohms dials, techtron appliances, scientific instruments

A self-contained demountable balance scale set mounted and housed in a timber box. Complete with balance weights - scales, balance, scientific instrument

Used in the Physics Department at the Ballarat College of Advanced Education.Desk-top electric calculator with 16 digit electronic display; 4 memories; operations controlled by keyboard. Type: Sharp Compet 363P; Serial No. 11110811Metalic adhevise strip label: "Ballarat C.A.E. PHYSICS"ballarat college of advanced education, physics, sharp, electronic calculator

This item was removed from a disused laboratory in 'S' Building, Mt Helen Campus. Emptying Cuvette Assembly #330-025 in a box.laboratory, cuvette, vacuum, g.k. turner, scientific instruments, america

Glass tube attached capped with metal and with a green plastic coated copper wire attached to conduct electricity. The other end of the tube narrows and has a metal 'prod' attached. The tube as a nother tube inside it which includes a spring made of fine wire. A small amount of thick liquid is present between both tubes.laboratory, testing, graham hood

electrical, graham hood, scientific instrument

William Spencer and Samuel Browning's were in partnership from 1778 to 1781. When Ebenezer Rust joined the partnership of Spencer and Browning in 1784, the firm of Spencer, Browning & Rust was created. All of the original partners of Spencer, Browning & Rust had died by 1819. The firm was succeeded by Spencer, Browning & Co. in 1840, following the 1838 death of Ebenezer Rust, Junior, son of the original partner. The successor company was in business until 1870.A monocular telescope in a tapered brass tube, with the middle two thirds coved with dark-brown leather. The eye piece end in telescopic, and is probably an add on. 83 cm long, 6.5 cm diameter at large end, 4.0 cm diameter at eyepiece end. Probably magnification is 1 7/8 inch. 48 mm focal depth of c79cm.telescope, scientific instrument, observatory, ballarat observatory, james oddie, ballarat boys' telescope company, spencer browning and co., astronomy

Ammeter in timber frame.ammeter, scientific instrument

Would have been used by staff and students of electrical Engineering at the School of Mines, Lydiard St. campus up until the start of the Mount Helen campus E building third floor. The meter would have had limited use in classes until 2009. This Wattmeter became part of the historical collection in 2011 after the movement of Engineering out of the E building. In working condition and a good example of early 20th century electrical instruments.A polished natural timber case with partial flip top lid and leather carry handle, housing a single phase AC Wattmeter, rated at 170 volts , 30 amps Scale 0 to 5 kilowatt. Serial no :210088Schematic diagram on inside lid showing how to connect the Wattmeter to measure a 3 phase balanced load. Paper sticker on top "1/92" Information for voltage and current ranges painted with white paint on left hand side by Voltage terminals Voltage terminals labelled A and N Also white on black "W8" on same surface Aluminium plate "67" on right hand side near current terminals which are engraved To A and Ti A to indicate current flow direction Aluminium sticker with Ballarat CAE Electrical Engineering by carry handleeverett instruments, single phase, wattmeter, electrical, scientific instruments

Probably a Lab Printing Integrator Unit for Gas Chromatography. This item was used on the Mt Helen Campus of Federation University in S-Building. hewlett packard 3380a, computer, scientific instrument

Tripod with 3.5 cm male thread tiltable mount (to suit Level CS - 147, 4110.) Wooden legs.surveying, tripod

The nested cup weights were designed to make the transport of weights, essential items in most commercial transactions, more convenient. This idea goes back to Roman times. In the nested cup form, a series of weights shaped into cups are set one into the other. Each cup fits precisely into the next, larger sized cup which each larger example weighing exactly twice that of the one previous. The Troy weight system was used for precious metals and gemstones.7 x Brass troy measures of various sizes. Fine groove lines near top edge and bottom 2 x Copper sliding weights - domed.1) 32 oz Troy around top .2) 16 oz Troy around top .3) VIII R around top. Maker's mark - lidded pot (coffee/tea?) with date 1826 .4) 8 oz around top .5) 6 oz Troy around top .6) 4 oz Troy .7) 2 oz Troy "WATERS" on top of sliders with "4" on under sidenested cups weights, troy weight, precious metals, gemstones, commercial transactions, sliding weights, domed weights

Roll of surveyors metal tape with brass handle stamped '100 ft'. Tape marked in 1 inch, 1 foot and 10 foot intervals. Held in roll with leather tie. End broken off (approx 5 feet missing).Brass handle one end only, stamped 100 ft. Tape stamped 'Chesterman Sheffield England'.surveying tape, scientific instrument

This item was purchased by Geoff Biddington, and donated after his death. It is believed to have been used at the Woomera Rocket Range.Cylindrical timber spiral slide rule with timber box. 808 L.R.W. 36fuller calculator, calculator, scientific instrument, biddington, woomera, woomera rocket range, slide rule, scientific objects, scientific instruments

The box is cleverly designed to give quick access to the parts inside, having a lift-up lid and a pull-down front. The components within appear to be a portable radio, power supply or power converter with batteries and a charger. The attached leather strap makes the equipment easily portable. The portable power supply is significant for representing part of the evolutionary change in communications. The unit connects the use of power and radio for communication with the ability to save the power in power packs or batteries, or to convert the power from one form to another.Power supply, portable, electric; circuits can be Parallel or Series. Batteries (6) fitted into a square wooden box. Box has two catches to secure the lid and two catches to secure the drop-down front. Holes have been drilled around the edges of the lid and the top of the base. Inside the front panel are two copper coils, switches and connectors. Leather carry strap attached. Stamped into the vertical panel are "parallel", "P", "H", "SERIES", CAVERTY", "LIGHT" :WEAK", "CHARGING" Stamped into the vertical panel are "parallel", "P", "H", "SERIES", CAVERTY", "LIGHT" :WEAK", "CHARGING" flagstaff hill, flagstaff hill maritime museum and village, warrnambool, maritime museum, maritime village, great ocean road, portable power supply, power supply, battery box, battery, communication, radio, portable radio, battery powered radio, electronic instrument

Watches and wristwatches have a glass over the watch face to protect the internal parts, the face and the moving hands from damage. The watch glasses are made in a range of diameters and heights according to the individual watch. A jeweler usually keeps a wide range of glass sizes and sometimes different materials depending on the purpose of the watch e.g. as a fashion accessory or a robust timekeeping piece. The glasses in these boxes have tissue paper between them and most have a label identifying their sizes.These watch glasses are an example of the stock items a watchmaker or jeweler would need to have on hand to service his customer's timepieces. Today's jewelers follow this example to be able to quickly attend to their customer's needs.Three boxes of watch glasses. The collection of circular, slightly domed, clear thin glasses includes different sizes to suit different watches and wristwatches. Many of the glasses have a protective paper on them that also has a printed size. (.1) small glasses in a "Country Life" cigarette tin (.2) medium glasses in a "Jewelex" cardboard box and (.3) large glasses in an open faded blue cardboard box.Protective papers with various sizes and codesflagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, jewelex, watch face, watch glasses, wristwatch glasses, clear watch glasses, jewellery, accessory, timepiece, timekeeping, early to mid 20th century

A foghorn is a device that uses sound to warn of navigational hazards like rocky coastlines, or boats of the presence of other vessels, in foggy conditions. The term is most often used with marine transport. When visual navigation aids such as lighthouses are obscured, foghorns provide an audible warning of rocky outcrops, shoals, headlands, or other dangers to shipping. An early form of fog signal was to use a bell, gong, explosive signal or firing a cannon to alert shipping. From the early 20th century an improved device called the diaphone was used in place of these other devices, The diaphone horn was based directly on the organ stop of the same name invented by Robert Hope-Jones, creator of the Wurlitzer organ. Hope-Jones' design was based on a piston that was closed only at its bottom end and had slots, perpendicular to its axis, cut through its sides, the slotted piston moved within a similarly slotted cylinder. Outside of the cylinder was a reservoir of high-pressure air. Initially, this air would be admitted behind the piston, pushing it forward. When the slots of the piston aligned with those of the cylinder, air passed into the piston, making a sound and pushing the piston back to its starting position, whence the cycle would be repeated. This method of producing a low audible sound was further developed as a fog signal by John Northey of Toronto and these diaphones were powered by compressed air produced by an electric motor or other mechanical means that admitted extremely powerful low-frequency notes. The example in the Flagstaff collection is an early cased and portable diaphone used on pleasure or sailing craft. By manually turning the crank handle air is produced and fed into valves that direct air across vibrating metal reeds to produce the required sound. in foggy weather, fog horns are used to pinpoint a vessels position and to indicate how the vessel is sailing in foggy conditions. One blast, when sailing on starboard tack and two blasts, when sailing on a port tack and three dots, when with wind is behind the vessel. Since the automation of lighthouses became common in the 1960s and 1970s, most older foghorn marine installations have been removed to avoid the need to run the complex machinery associated with them, and have been replaced with an electrically powered diaphragm or compressed air horns. The example in the collection is significant as it was used in the early 19th century for sailing vessels was important but these portable crank fog horns have also been superseded by modern electric varieties. Therefore the item has a historical connection with sailing and maritime pursuits from our past.English Rotary Norwegian Pattern nautical foghorn within a boxed pine varnished case with exposed corner dovetailing, original leather carrying strap, brass side crank, and original copper trumped horn. Card accessory with Directions for Use in both English and French.Noneflagstaff hill, warrnambool, shipwrecked coast, flagstaff hill maritime museum, maritime museum, shipwreck coast, flagstaff hill maritime village, great ocean road, foghorn, maritime technology, maritime communication, marine warning signal, portable foghorn, bellows foghorn, crank handle, robert hope-jones, john northey