What device converts AC to DC? rectifier A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification, since it "straightens" the direction of current. The unit was used at Ballarat School of Mines in the Maths, Science and Physics Departments.Grey metal unit with Dials on the front and vents at the back. Handle for carrying. Two switches for turning on and off. Yellow sticker - SMB - with number 116071. Engraved on back - S.M.B.. Maths / Science / Physics Sticker on cord indicating inspection of unit - 13/04/2005. Tag Number - 032735alternating current, direct current, ac, dc, rectifier, electrical, ballarat school of mines, science, maths, physics

Alternating Currents by Edward T. Larner, published by CROSBY LOCKWOOD AND SON, Stationers Hall Court, Ludgate Hill E.C.4, 1923, Printed in Great Britain at Darien Press, Edinburgh.Alternating Currents by E.T.Larner Publisher Crosby Lockwood & Son Dated 1923flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, alternating currents, book, e.t.larner

Dark Blue synthetic hard caver book of 440 pages with gold lettering embossed on the spine. non-fictionelectricity, optics, force, electrostatic, charg and capacity, electric currents, magnetic field, alternating current circuits, electromagnetic waves, radiation, conduction, dielectrics, geometrical optics, interference, heat radiation, diffraction

The unit was used at Ballarat School of Mines in the Maths, Science and Physics Departments.Grey metal unit with Dials on the front and vents at the back. Handles for carrying. Two circuit breaker switches, two DC output sockets, two AC output socketsYellow sticker - SMB - with number 116069. Engraved on back - S.M.B.. Maths / Science / Physics Sticker on cord indicating inspection of unit - 13/04/2005. Tag Number - 032725alternating current, direct current, ac, dc, electrical, ballarat school of mines, science, maths, physics, ac/dc, scientific instrument

The book was published for the use of personnel of the army, navy, marine corps and coast guard. The book was used by Charles Bacon who studied at the University of Nevada in the late 1930s/early 1940s. Bacon worked at Bunker Hill Mines and Kellogg Idaho, before arriving in Australian in 1951. He worked for CN Myers, a company involved with paper converting. CN Myers was a family business (on Charles Bacon's maternal line).Blue soft covered book of 607 pages. Chapters include electrical Algebra, fundamentals of Electricity, Wiring, Magnetism, Armature Wiring, Generators, Motors, Controllers, Geometry and Trigonometry, Alternating Current, AC Circuits, Transformers, Polyphase Systems, Alternators, Induction Motors, Stator Winding, Multi-Speed Induction Motors, AC Controllers, electrical instruments, Electron Tubes, Welding Systems, Welding Systems, electrical Drawings. charles bacon, mining engineering, metallurgy, university of nevada, armed forces, world war 2

This testing voltmeter recorder was last certified by SEC Vic laboratories on the 17/4/77. It was used extensively as mobile recorder placed for periods of one month at locations experiencing unacceptable fluctuations of power. These locations would cover the North East regions of Victoria. They cover voltage drops at domestic and business properties especially those that were experiencing regular fluctuations(daily) at approximately the same time of the day. As the electrical network is required to operate within a set level of voltage, fluctuations outside of this has to be investigated and necessary remedial action taken. This is especially so for rural properties where power "drainage" can occur through animal/bird and tree interference. It can also be the result of defective wiring and overloading at peek operational times (milking machines).This mobile voltage recorder is very significant to the Kiewa Valley because it highlights the difficulties that can occur in maintaining a power supply that experiences fluctuating power demands by the rural industries that it supplies. The requirement of a mobile testing apparatus to cover the various sections in the Kiewa Valley and other rural areas in the northeast region is one of necessity as electricity once connected to a rural property is a labour saving supply as generators on rural properties require a higher degree of maintenance an ultimately at a higher cost. The testing of the SEC Vic supplied electricity to rural properties,those who had previously run on generators, had to be quick and unassuming with certainty of correct supply levels.The mechanism of this voltage recorder has been installed(by the manufacturer) into its own protective wooden box. This box has a front (swing open) lockable section which permits direct access to the installed measuring equipment (for servicing and data collection). The top section of the box has two screw on terminals for access to the machine being tested. This tester has its own inbuilt ink supply facilities and a mechanical clockwork device that unwinds a roll of paper onto a second roll at a rate of 10 mm per hour. The recording chart is marked with time slots against voltage. There is a recording arm which has an ink pen at the end. Both arm and pen carry the ink supply from the ink reservoir, located on the left side of the cabinet door in specially constructed bottle holder( three small bottle capacity). To record a suspect power problem to a home or business establishment the voltmeter is connected to a power supply outlet being tested and wind the recording clockwork mechanism (gives a four week running time). Before leaving the recorder in situ the electrician checks to see if the chart is recording the correct voltage and that the clock mechanism is advancing correctly.On the front of the access "door" at the top a metal label "RECORDING AMMETER" below this "MURDAY SYSTEM" below this "ALTERNATING CURRENT" and below this the manufacturer's registered number "No. 139156" Below this is a metal tag with State Electricity Commission of Victoria Electrical Engineer's Section equipment number "338" Below these tags and above the viewing window is the manufacturer's dtails "EVERSHED & VIGNOLES Led LONDON"sec vic kiewa hydro scheme, alternate energy supplies, alpine feasibility studies temperature, rainfall, power outages

Volt-Meter from'Plaza Theatre', Mitchell St. Bendigo. A tag attached has the numbers 1-4-78 and says ' This meter was ''.(illegible!)' The scale goes from 0 to 120volts. And was manufactured by 'Nalder Bros & Thompson Ltd London.. It also measures both DC and ~ 50 (50 cycles per sec alternating current) Case is circular and made of a dimpled metal. With a 'half moon' shaped display. Case is approx. 200mm in diameter and 60mm deep

When this AVOMETER was being utilised in the early 1950's it was at the "leading" edge of electrical measuring instrumentation.The first meter was produced by Automatic Coil Winder and Electrical Equipment Co. in 1923. This model was produced in the time from 1933 to 1951 when it was superseded by the most popular model, Model 8 (1951 to 2008).This AVO meter brought the measuring of three electrical power indicators i.e., amps, volts and ohms into one measuring unit. By using a "one fits all" unit, the carrying of separate measuring devices was reduced considerably. The need for a mountainous and a large area of operational requirements, such as the SEC Vic Kiewa Hydro Electricity Scheme, to minimise the weight of equipment carried by electricians and technicians was of the utmost relevance. The significance of this meter to the Kiewa Valley region relates to the impact of modern technology (at that time) upon a mainly rural environment. This equipment shows how the boost of "modern" equipment into the area because of the "Hydro Scheme" was facilitated a lot faster than would have taken under "normal" evolutionary time. The speed of information on all "new technology" had a relatively slow assimilation rate to those living in rural communities. This AVOMETER is a Model 7 MKII, production pre 1951. This meter measures electrical Amps, Volts and Ohms and has two internal batteries for its power. The main casing is made from aluminium with a bake-lite front. The front has a "window" detailing, with a needle pointer, the amount of electrical power being tested. There are two big dial switches, detailing Direct Current(DC) and Alternating Current(AC) when reading measurements of Ampere, Voltage and Ohms for power. This meter took the place of three or four meters used earlier. Modern meters (2000 onwards) have become digilised and are considerably lighter in weight and smaller. There are two electrical connection leads (one black and one red) each has a removable clasp and is 125cm long.Molded on the front centre panel " UNIVERSAL AVOMETER". Below this and above the left hand dial "D.C. SWITCH" .Above the right hand switch the right "A.C. SWITCH". On the left of each switch is an arrow pointing to it.The left switch is marked with a "+" and the right one with a "-". There is a "divisional 2" mark. Between and below the dials is "CUT OUT" plunger.electrical meters, electrical equipment, sec vic., state electricity commission of victoria, mt beauty, bogong village

DEFINITION microfarad Posted by: Margaret Rouse WhatIs.com Contributor(s): Kenda, Jack Clements The microfarad (symbolized µF) is a unit of capacitance, equivalent to 0.000001 (10 to the -6th power) farad. The microfarad is a moderate unit of capacitance. In utility alternating-current (AC) and audio-frequency (AF) circuits, capacitors with values on the order of 1 µF or more are common. At radio frequencies (RF), a smaller unit, the picofarad (pF), is often used. This unit is equal to .000000000001 (10^-12) µF. In RF scenarios, capacitances range from about 1 pF to 1,000 pF in tuned circuits, and from about 0.001 µF to 0.1 µF for blocking and bypassing. At audio frequencies (AF), capacitances range from about 0.1 µF to 100 µF. In power-supply filters, capacitances can be as high as 10,000 µF. Capacitor, 1/3 M.F.D. (microfarad) within wooden insulating box. Two terminal posts set in an insulating box. Maker's name and place 1/3 M.F.D No. 34402scientific instrument, capacitor, electrical engineering, laboratory

The first tape based talking book machine from the late 1950s, produced by Clarke & Smith, that allowed the listener to hear up to 20 hours of recordings. Although bulky (each tape cartridge alone weighed over 2 kgs), the MK1 was the first magnetic, multi-track tape produced and considered quite novel for it's time. The cartridge designed to be played on the Clarke & Smith Model12 Talking Book gramophone was designed to house the pick up mechanism (the phono cartridge which contains the stylus) in the lid, so that visually impaired people could just close the lid to play the record. Initially these players designed to handle only 24 rpm, but soon added 33 rpm and 16 rpm options via the dial located on the left hand corner of the disk base. Directions for using as well as reminders to use on alternating current only are located inside the lid. On the side of the player are two plastic dials: one for turning on and volume, the other for tone.Metal record player housed in a brown wooden carry case, with a speaker grill in the front, two plastic dials on the side and an electric cord extending from the back of the case.Manufactured for Nuffield Talking Book Libraryaudio equipment, clarke and smith

Until late 1925, all record players reproduced sound by purely mechanical means and relied on a so-called "amplifying" horn to efficiently couple the vibrations of the stylus and diaphragm to the space occupied by the listeners. In 1906, the Victor Talking Machine Company, Columbia's arch competitor, introduced a line of models in which the horn and other hardware were concealed within a cabinet, made to look like fine furniture rather than a mechanical device. They named the new style a "Victrola". It quickly proved to be very popular and successful. Other makers, adopting the distinctive suffix, introduced their own "-ola" internal horn machines, such as Edison's Amberolas and Columbia's Grafonolas. They were soon outselling the external horn models. At first, like nearly all other early record players, all Grafonolas were driven by a spring motor that the user had to wind up with a crank before playing a record. In 1915, Columbia began to introduce electric-motor-driven models, as a majority of urban areas had been wired to electrical grids. The electrified Grafonolas supported both alternating and direct currents from 110 to 220 volts. Electrified Grafonolas never gained the popularity enjoyed by the spring motor-driven versions due to substantially higher prices and a lack of electrical service in rural areas. Grafonolas were manufactured under the 1886 United States Letters Patent No. 341,214 which Columbia Graphophone company acquired through its predecessor American Graphophone Company. Two models were available; a portable table model and bigger stationary floor model, offering limited mobility through the application of casters. The most notable table models included Grafonola Favorite introduced in 1911 and Grafonola Savoy introduced in 1915. The most notable floor models included Grafonola Symphony Grand introduced in 1907, Grafonola Regent introduced in 1909, Columbia Mignon introduced in 1910, Grafonola Princess introduced in 1911, Columbia Colonial introduced in 1913. Various period Grafonolas were introduced in 1917 to cater to an increasingly prosperous clientele. Columbia Phonograph Company began to manufacture a series of ornate, limited edition period machines. These were highly priced (some as high as US$2,100 ) special orders that provided consumers with options to choose styles which matched their interior décor. Although the Gramophone does not have a large monetary value, it is of social significance as it demonstrates the progress made in audio reproduction from the first Edison cylinder machines to improvements that allowed ordinary people to be able to buy music discs and enjoy music in their own homes. Gramophone with internal horn, floor model, mechanically operated by a crank handle. Colombian Grafonola Princess (Type F2) brand. Gramophone is in a wooden display cabinet with room for record storage underneath and is complete with handle. Manufactured in 1911 by Columbia, USA."Columbia Grafonola Type 2 Made in USA"flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village, record player, gramophone, mechanical gramophone, floor model gramophone, gramophone record, columbia graphophone company, american graphophone company, columbia, grafonola, grafonola princess, music, playing music, audio reproduction, sound equipment, domestic entertainment, 1911 gramophone

This analog voltmeter is quite a large (industrial type) apparatus which permits the easy monitoring of electrical variations within the large SEC Victoria Hydro Scheme's electrical generators. These generators are powered by the hydro force of "stored" water at a higher altitude. The establishment of both the NSW and Victorian Hydro schemes was achieved from the mid 1900's to the 1960's. At this point in time the need for additional power sources to quench both an industrial and domestic demand for electricity was purely an economic and not and environmental (carbon reduction) factor. This hydro scheme was instigated by "the Government of the day" as a bold move and was the major force of the World War II refugee and "technical" workforce inclusion of skilled and unskilled migration into the Australian environment. Although this mass "invasion" of workers with families was thought of in some circles as intrusive, the expansion of population post war years and its integration into the Australian rural sector, produced the multi- lingual multi-cultural diversity of later years. This voltmeter is very significant to the Kiewa Valley as its use was introduced during the Kiewa Hydro Scheme. Although only a small apparatus it was part of the explosion of human resources into the valley. This influx of population transformed the region from that of a basically quiet rural region to one which evolved into both an industrial and a larger residential community. This evolution in the valley created a change, not only in the "physical" landscape but also the socio-economic expansion which permitted other "tourist" based industries into the valley. This analog volt meter has two metal rods protruding from the "back" of instrument with screw on points for the negative and the positive leads allowing the "current" to flow across the calibrated resistors to indicate on the "face" side the strength of the voltage "power". The "face" of the instrument has a zero point and then five evenly graduated marks from Zero to the "100, 200 and 300" marked points of measures. A large "V" below these pointers indicates that they represent levels of voltage. Three small screws hold the "face" in place. At the back of the meter is an aluminium "clasp" with three protruding screws (positioning fasteners) and a a screw tightening fixture for the correct fastening of the "clasp" into the correction location on the meter "board".Manufacturer's logo "CSG" underneath "ITALIA"kiewa valley tourism, victorian alps, alternate energy supplies, alpine population growth

This hollow core bit has hard cutting inserts for drilling into rock. It was used to drill and recover 50mm diameter (most common size) rock cores. The rock cores were assessed by geologists and engineers to provide information for design of structures such as tunnels, dams and underground power stations (eg. McKay Creek Power Station, West Kiewa Power Station). This type of bit was also used where damage to the surrounding rock had to be minimised. The Diamond Drill Bit,used in the early 1900's, when it was primarily used as a method of sampling rock for ore deposits and oil exploration resulting in a "coring" of rock. The use of "coring" to obtained samples for the SEC Kiewa Hydro Electricity Scheme(1920's onward) was to analyse the core to obtain temperature and rainfall patterns shown by the levels of layered solidified soil(rock). This diamond drill would have been used in the early 1900's to provide a sub strata map of temperature and water patterns (over an long period of time). This was a pre requisite to any decisions about the viability of the region to provide the water needed for a successful hydro electricity scheme.This diamond drill for core sampling was at the forefront of the analysis whether to construct a hydro electrical facility in the Kiewa Valley and the adjoining alpine region. The rock core samples produced were assessed by geologists and structural engineers. It was only after extensive core drilling covering the region that solid scientific evidence could be provided to start the "SEC Vic Hydro Electricity Scheme" within its current boundaries.This "diamond" drill bit has eight "teeth" at its cutting edge. The drill creates an 55mm hole in extremely hard rock material to obtain 50mm core samples.. Three quarters down the shank it has thread screw channels to attach the bit to the drill pipe. The coring pipe attaches via screwing it onto this bit. Core samples are the main objective of this tool.alternate energy supplies, alpine feasibility studies temperature, rainfall, sec, kiewa hydro electric scheme, electricity

This tester was used between 1950 and 1980's. As part of the Occupation, Health and Safety requirements, equipment used to monitor the performance of electricity producing generators, regularly, hand held testers were used to check the insulation and the "earth" pin were up the the required operational levels. As the generators and their ancillary monitoring equipment was spread over a large area and cumbersome to service small hand held devices were required. These had to always be safe for the user to operate. A selected range of high quality meters were recalibrated every two years in the Meter and Calibration Laboratory at Yarraville(near Melbourne) This meter is very significant to The Kiewa Hydro Electricity Scheme because it was an integral part of maintaining the electricity producing water driven generators of the power stations. The reason why this meter was so essential is that provided the safety check on equipment used to monitor each Hydro Generator that they were complying within the grid network parameters. Grid parameters are set so that if there is an electrical fault on the system, that fault can be attended to with a very small change in the output stability of each generator. It is essential that the voltage of the network remain within the set limits. Generators are at Dartmouth, Mackay, Clover, West Kiewa, Yarrawonga, Cain Curran and three Power Stations in the Thornton area.This hand driven current generator produces 500 volts by winding the handle(on funnel curved side) to keep the voltage constant(one minute per test). The whole body is made from caste aluminium. One of the functions of this meter is to test the isolation resistance of any equipment being tested. This is to see if that equipment is safe to handle(no electrical shocks). The second function is to test the earth pin of any portable electrical equipment. The turn key on one side can direct which function is required(marked insulation or continuity). On the top side(enclosed in a glass fronted marked scale) is a continuity scale(top) and an insulation scale(bottom). This is covered , when not in use by "flip up" lid with manufacturer's details and name of the instrument. Opposite the winder are two screw tight knobs. One marked earth(left side) and one marked line(right side). On the top and next to the glass windowed scales in a post manufacture SEC Vic equipment equipment ID number. For carrying purposes there is chromed steel (fold together) handle.The bottom of the unit has two metal "feet" 150mm long by 114mm wideManufacturer's details on top side "MEG" underneath "INSULATION AND CONTINUITY TESTER" below this "constant 500 VOLT pressure" below this "REGISTERED MEG MEGGER TRADE MARK" below this "REG DESIGN NO. 690326" below this "UNITED KINGDOM PATENT Nos. 193746, 197178, 198182, 202062, 202398, 204649, 350715" below this "SUPPLIED BY THE GENERAL ELECTRIC Co. Ltd OF ENGLAND" below this "MAGNET HOUSE, KINGSWAY LONDON W.C.2" 'sec vic kiewa hydro scheme, alternate energy supplies, alpine feasibility studies temperature, rainfall

This medical bureau / cabinet shows several signs of being used for a different purpose before being a medical bureau. It once had the words "GENUINE PURE QUALITY" lettered across the top of the front, as can been still seen from the impression left behind in the stained timber. On each drawer above the handle is a faint impression of something long and rectangular, as though there had been a label attached. The front panel of the drawers is made of the same wood as the rest of the outer cabinet, most probably blackwood. The handles on the drawers are not the original handles either. There are 3 filled-in holes that would form the corners of a triangle, apex at the top, around the perimeter of the current handles. The sides of the drawers are made from plywood and the base made from alternating lengthwise strips of oak and beech wood pressed together, rounded corners at the back and joined to the front panel with metal brackets. The backs of the base of the drawers have four round impressions in them. Along the back edge of the base, in the centre, is a rectangular hole. Between the front pair of round holes is a faint black rounded marking, like the impression made by rubber. The cabinet may have once been a filing cabinet, with the drawers used as document drawers, each with a spring-loaded clamp attached to the back of them to secure documents within. The original handles could have been the half-cup type used for filing cabinets. The construction and use of plywood could place this cabinet in about 1950's.Chest of drawers (or Medical Bureau, or Apothecary Chest, or Filing Cabinet) wooden, dark stained, with 30 small drawers (10 rows, 3 columns). The outer wood of cabinet is possibly blackwood and the edges of top and sides have carved wood decoration. Drawer fronts have bevelled edges and round silver-coloured metal knobs. Drawers have plywood sides, and oak and beech wood bases/, Each drawer has four round depressions (in a square-shaped arrangement) at the back plus a small rectangular hole cut in the centre back of base. A faint impression from previous lettering is evident in the wood stain across top front of cabinet.Impression of previous lettering across top front of cabinet "GENUINE PURE QUALITY". flagstaff hill, warrnambool, shipwrecked coast, flagstaff hill maritime museum, maritime museum, shipwreck coast, flagstaff hill maritime village, great ocean road, drawers, bureau, cabinet, chest of drawers, furniture, bedroom furniture, household storage, medical bureau, apothecary cabinet, document drawers, filing cabinet

Diggers & Mining. Diggers and miners. Many diggers not only moved from field to field, but alternated between gold digging and other occupations. Slide; THE STATE OF VICTORIA - - - Gold digging and other sorts of labour have arrived at a sort of equilibrium; and streams of people are now flowing from the one occupation to the others, and visa versa. A few weeks ill luck at Bendigo disgust a man with his auriferous well sinking and he goes into some sort of service. A dispute with his master chiming in with some current takes of mining success sends him back to the diggings again; and so the stream flows backwards and forwards keeping - - - the wages of all kinds of labour at an equilibrium - - - (M.M.H., August 19, 1853) Markings: 46 994:LIF I. Used as a teaching aid.hanimounteducation, tertiary, goldfields