Historical significance.Large steel machete in canvas scabbard with webbing frog.D.Arrow D (Dept. of Defence) DC-44 inscribed on blade.

Robin Boyd developed a close friendship with the founder of the Bauhaus in Weimar Germany, Walter Gropius, who had moved to the USA in the 1930s. Through this connection, Boyd was invited to be the Massachusetts Institute of Technology (MIT) Bemis Professor at the School in the North American academic year 1956-7. Robin and Patricia Boyd, with their youngest daughter Suzy, were based in Cambridge, Massachusetts for the year. Boyd gave some lectures at MIT and he was also invited to give lectures at many other universities, allowing him to travel widely within the USA, especially on the East Coast. This gave him the opportunity to meet architects like Frank Lloyd Wright, Eero Saarinen, Paul Rudolph and many others, and visit the offices of Skidmore, Owings and Merrill, and places like Taliesin and the General Motors Technical Center Detroit. On the way home, the Boyds visited London, Berlin, Paris and Le Corbusier’s Ronchamp Chapel in France.Colour slide in a mount. White House north portico, Washington DC, USA. (Architect: Alexander Smith Cochran.)Made in USA/ White Hse. (Handwritten)/ Encircled 51F (Handwritten)/ C23 (Handwritten)/ 62mit bemis professorship, mit, robin boyd, slide

Colour slide in a mount. US Capitol Building, Washington DC, USA. (Image taken from inside the Washington Monument.)THE CAPITOL / Telephoto view from Washington Mon / D (Handwritten) / Encircled 15 (Handwritten) / RB (Handwritten)washington dc, slide

Created to supply training and recognition of friendly/enemy aircraftExpanded the skills of recognition for air crew, ground crew and defence activities.Small bakelite Spitfire Mk 5 aircraft, coloured matt black, including hole for suspension and mobility."Spitfire" Mk.V. Trop. E9-2275 D^D DC LTD

Galt Mfg Co in Canada produced shell percussion caps for allied munitions during WWI. This cap would have been attached to the end of a shell and provided the ignition to cause the shell to explode. It has a small arrow in a circle on the base which indicates use in the Australian Military.This object can tell the story of allied war production, showing that it was produced in Canada and used in Australian munitions. Brass shell fuse, rounded pyramid in shape.m Has multiple sections and a ring of measurements around the circumference. Lighter coloured cap on the top. Has a number of holes on the surface.Underneath: Galt Around the cirumference: DC, and measurements 1-22 cmgalt, shell, percusssion, cap, munition, brass, manufacturing, war, wwi

Compressor Fuse - electrical item - fitted between the main incoming DC line from the trolley wire and the compressor on an air braked tramcar. Has brass end caps, a red Bakelite type material separating the ends, containing a 5Amp DC fuse wire. Has a plastic label - teal coloured with the number "5" printed on three times.trams, tramways, compressors, fuse, electrical equipment, tramcars

Olive green enamelled stereoscope enclosed in olive green wooden hinged box. Two test stereoscopic pictures of a rhino also kept in box. A wooden oddment (10 cm) is also enclosed.Engraved in white on stereoscope: “DC-1940 Serial No. 32” Label on front of box: “stereoscope”

Report - single foolscap sheet titled "Bridging Transition" describing the electrical circuit arrangements while passing from series to parallel in DC traction tramway motors.trams, tramways, tramcars, controllers, electrical engineering, electrical equipment, motors, electric traction

Information from Norman F. Dalton: Ballarat had a reticulated DC supply in the early part of last century and in 1905 had sufficient generating capacity to enable the trams to be changed from horse drawn to DC electricity. The use of electricity increased with the main power station located on Wendouree Parade, near Webster Street, under the ownership of The Electric Supply Company of Victoria. AC generating plant was installed in 1925 and conversion to AC proceeded. In 1934 the company was taken over by the State Electricity Commission Victoria (SECV) and more AC generation was installed and the changeover of customers was accelerated. This is around the time that the Synchronome Frequency Checking Mast Clock was installed at the Wendouree Parade Power Station. The SECV Annual Report of 1921 states: ::Section 11 of the act directed the COmmission to enquire into the question of securing the adoption of such standards of plant and equipment of a system, frequency and pressure for the generation and distribution of electricity as will admit of the efficient interconnection of undertakings throughout the State. In 1934 when the SECV took over the Ballarat operations the question of linking with the State grid had been a planned operation for some years but due to financial considerations had hindered it and in fact would continue to do so for a further 10 years. So while the need for close frequency control for interconnection was hardly an issue, the need to keep electric clocks correct was important, particularly as this item was a frequent sales point to cover the inconvenience and sometimes expense of converting from DC to AC. The clock is a very accurate pendulum clock with provision for varying effective length during operation for precise time regulation. There are two normal time dials and one is controlled by the pendulum and the other is operated by the system frequency. When the clock was in use it was installed by the MEter and Tests Laboratory and the time was checked daily by radio time signals. The two dials were repeated in the operators control panel in the Power Station. A maximum deviation between the two dials was set in the operating instructions (eg 5 seconds) and the operator would correct this when necessary by remote manual alteration of the turbine governor set point. The clock was used to drive and regulate a system of "slave" clocks which were used to display the time in various locations around the power station. A slave clock is a simple clock which is driven by a small electric motor, its accuracy is regulated by the master clock every 30 seconds to ensure that it and all the other slave clocks in the station are on exactly the right time; slave clocks were placed in various locations, from common rooms to workshops. A master clock could potentially run thousands of slave clocks at one plant. The clock also contains a rectifier. A rectifier is a device that is used to convert AC power to more stable DC current.Two clocks in a timber case. Both are electric, one is powered by the main pendulum mechanism, the other is a self contained electric clock. The main mechanism is of the gravity arm and roller type, which sends an impulse to the slave clocks every 30 seconds. The This Synchronome Frequency Checking Master Clock was used at the Ballarat Power Station. Below the main section of the case is a smaller cabinet containing a rectifier to provide consistent DC power for the clock. The rectifier was made by the Victorian company Hilco, which was located in Burwood. There is a high chance this is not the original rectifier from this clock as there appears to be brackets to hold a larger device in the space the rectifier occupies.Front below main clock face on front of case: "Patented Sychronome Brisbane" Lower left-hand clock face: "Frequency time" Lower right-hand clock face: "Standard Seconds" Synchronous electric clock mechanism on door (Frequency time clock): >200/250 V. 50~ >"Synchronomains" Made in England >Direction indicator for clock starting switch >"To start move lever in direction of arrow and release" >"Patent applied for" Mechanism for "standard seconds" clock: >"English Made" >"Patented" >Serial number "321" >0 above right-hand pillar on front-plate Mechanism for "standard seconds" clock: >"English Made" >"Patented" >Serial number "321" >0 above right-hand pillar on front-plate Mechanism for main clock face: >"English Made" >"Patented" >Serial number "8751" >0 above right-hand pillar on front-plate Inside case, back panel, top enamel plate: >Seconds Battery + Pos. > Battery Common or - Neg. >1/2 min dials Inside case, back panel, bottom enamel plate: external seconds dial Inside case, right hand side, electrical knobs: two switches, both "A.C. mains" Pendulum rod, below suspension spring: Serial number (?) 0000005 Rectifier in bottom cabinet: >"Hilco Rectifier" >"A.C. Volts 230/240" >"Model 1060/S" >"A.C. Amperes" >"Serial No. 1060/S >"Phases 1" >"D.C. Volts 6" >"C.P.S. 50" >"D.C. Amperes 1" >"Made in Australia by Hilco Transformers McIntyre St., Burwood, Victoria." Bakelite electrical plug: makers mark Lower cabinet, RH side panel, pressed tin plate: "AC" (upside down) Brass speed adjustment, outer right RH side: "S" and "F" Ivory and wood pendulum beat ruler: >Ruler, with 0 in centre and numbers 1-5 in ascending order from centre on left and right. > "Synchronome Patent." Steel plate, back panel, inside case, right hand side: >N R A" (descending) >"2191" serial number/part number Face of main clock: "Synchronome Electric" synchronome frequency checking master clock, electricity, state electricity commission, wendouree parade power station, secv, clock, time, pendulum, electric supply company of victoria, norman f. dalton, ballarat power station, rectifier, slave clock

A Wright and Ditson 'DC Model' (i.e. Davis Cup Model) tennis racquet, with: concave throat; bevelled crown; string whipping around shoulders; and, bald, thick octagonal handle. Decal inscription along throat on obverse: WRIGHT & DITSON/DC/MODEL. Wright & Ditson cursive logo features along throat on reverse. Materials: Wood, Lacquer, Glue, Metal, Paint, Ink, Leather, Gut, Stringtennis

Used in Pacific War during WWIIBlack covered Electro Mechanical analogue computer with small indicator dials with two divisional connected boxes. Mounts on Minneapolis Honeywell 'stabilizer' unit.Minneapolis Type G1029 A3CAZ HZ 26 Volts DC CV. Serial No. C-24825 B3430

Photograph showing twisted metal and broken trees at the site of the Kyeema DC-2 aircraft crash into the western slope of Mt Dandenong on 25th October 1938. All 18 on board perished.kyeema, crash

Electric shaver in ivory-coloured plastic casing with stainless steel head and metal terminal encasing wiring. Three-point plug attached.Front: ARVIN / DE LUXE / AC / DC/ 15W Reverse: MANUFACTURED IN / ENGLAND / PAT No. 524412 / OTHER PATS PENDelectric shaver, arvin

Black and white photograph, a collection, train derailment. Photo of a pile of grain being pumped up into a truck, with a corrugated iron looking tank, sitting on top of truck. Registration either OC-230 or DC-230.place, train, derailment, photograph. train derailment. sea lake. 19th june, 1961. mileage 139.

A.C. Bridge MK 7A. A black instrument panel with controls, connectors and a 0-5- microAmpere DC indicator located on thetop face, and the electrical components located on the underside. No mounting frames, hence components exposed and vulnerable. scientific instrument, barlow and kelly, a.c. bridge

When the US entered WW11, the Army moved quickly to provide training materials. In many cases it drew on British experience.Representative of training documents from early years of WW11Black and White covered booklet " Removal of wounded from Tanks" '.Military Intelligence Service Information Bulletin No. 17- War Department - Washington. DC. dated 5th June 1942. 28 pages, soft cover, saddle stitched and stapled.Ink stamp on first page " RAEME Trg Centre, Training Publications, Register No 20145 "usa, tank, training

From Ron in Washington DC to Patricia Davies regarding visit to Melbourne and Australian Ballet and about Watergate and US elections.Addresses and phone numbers and notes

Trolley wheels are used to contact the overhead copper wire, they rotate and connect the DC power to drive the tram's electric motors.Brass trolley wheel mounted on a turned wooden support.bendigo tramways, tram, trolley wheel,

Shows the removal and packing of the bulbs used in sub-stations to rectify or change the electrical power from AC to DC for tram use.Demonstrates the removal and packing of mercury arc rectifier bulbsSet of five digital images of decommissioning mercury arc equipment or bulbs at a sub station during 2005. trams, tramways, substation, mercury arc, yarra trams