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

D.C. Volt ratio box. 100 OHMS per volt. Black terminal post pane;, inside a polished box with hinged lid and leather carry handle. Serial Number: 3021scientific instrument, volt ratio box, physics, laboratory, electrical instrument, electrical engineering

Eight various valves. .1) Matchlett Rectifying Valve Type ML-IE, 11.7 AMP@10v, oil immersion .2) Mullard TY2-125, Serial Number 4878./3 26UJ 5U4GB Miniwatt 980 .4) Electonic Comany New Jersey ELCGH-1/5 Collidge Tube, G.E./GMINNIWATT955 6x5GTscientific instrument, valves, mullard, rectyfying valve, electrons co, eimac, general electic, lamp, machlett laboratories inc., miniwatt

Large black and white photograph of two students at a Polariscope Bench polariscope, scientific object, students, student activity, laboratory

Large black and white photograph of student seated at metallurgical electron microscope.black and white photography, metallurgical electron microscope, laboratory, scientific equipment, metllurgy

Hand drawn ink plan with colouringsmb buildings, ballarat school of mines, buildings, model mine, mining laboratory, grant street, lydiard street south, dana street, albert street, old chemistry building, architectural plans

Four colour photographs of a metallurgy kiln in use at the Ballarat School of Mines. ballarat school of mines, metallurgy, metallurgy kiln, assay kiln, laboratory

Used at the Ballarat School of Mines campusA divided box with around 50 glass test tubes in it.test tube, laboratory, chemistry, scientific instruments, laboratory equipment

Glass flasks used at the Ballarat School of Mineschemistry, laboratory, scientific instruments, glass flasks, beakers

Glass screw top bottle used at the Ballarat School of Mines for Chemistry classes. ..2) Glass flask with measuring increments by Trubor chemistry, laboratory, scientific instruments, glass flasks, beakers, bottle, trubor

Two ceramic funnels with rubber stops used at the Ballarat School of Mines.chemistry, laboratory, scientific instruments, funnel

Glass flasks used at the Ballarat School of Mineschemistry, laboratory, scientific instruments, glass flasks

Three glass beakers used at the Ballarat School of Mines for Chmistry classes.chemistry, laboratory, scientific instruments, glass flasks, beakers

These items were used at the Ballarat School of Mines Chemistry Laboratroy, which was dismantled in 2016.8 x glass measuring pipettes chemistry, laboratory, scientific instruments, pippette

These items were used at the Ballarat School of Mines Chemistry Laboratroy, which was dismantled in 2016.7 x glass thermometers chemistry, laboratory, scientific instruments

These items were used at the Ballarat School of Mines Chemistry Laboratroy, which was dismantled in 2016.Black plastic covered metal test tube drying rack.chemistry, laboratory, scientific instruments, test tube drying rack

Maroon photograph album with photographs thought to be Ballarat College of Advanced Education Science students and staff. Includes a photograph of the Lal Lal Ironworks kiln in the early 1970s.ballarat college of advanced education t-shirt, bbq, ray martin, brian sunter, laboratory, mineral industry laboratory, mount helen, bill vermeend, frank hurley, jim thyer, barry shearer, lyn robert, frank martin, colin kline, alan ballard, roger johnson, david james, ian mckee, robert pyke, bushnell, judy dixon, dennis else, john murray, peter dahlhaus, kim dowling, richard macewan, aziz albazazz, susanne hynes, stafford mcknight, bob smith, paul bennett, athol shelton, peter richards, geoff brooks, computers, snow, snowman, bruce cameron, iron monarch, mining, lal lal iron mine, ginny goff, ausimm scholarship, diane haddon, david martin, glenn kreelman, sunter's, clarendon, anne beggs sunter, foundry, stawell, brian sunter's farewell, jack harvey, microscope, metallurgy

Graham Beanland's logbooks for the Electrical Branch Hydro-Design Section. Beanland was later the Principal of the Ballarat School of Mines. Four foolscap books with handwritten notes. .1) includes Richmond Power Station, Midworth Statino Load Indicator Transmitter, Thomastown Experimental Line (220v), The story of Richmond, Power factor curves, dryout of 6.6. KV motor, etc .2) Pressure Tests at Mt Waverly Pump Station, Shunt capacitor Bank for Bendigo, Shepparton Main Substation, Boronia Level Crossing - Supply continuity. commissioning Warragul Main Sunstatin, Tests carried out on Sedgewick installation, Bendigo Main Substation, MMBW Instalation at McVeighs, The South-Western Story, etc .3) History of Kiewa Hydro Scheme, Kiewa Scheme Layout Plan, Kiewa No. 4 Main Transformers, Motor operatied Power-Station lift, etc (included flyers "Power From Kiewa" and "White Coal", etc .4) Newport B and C Power Station, Yarraville Maintenance Workshops, Richmond and Brusnwick Terminal Stations, Rubicon-Eildon Area, Kiewa No.3 Power Station, etc.graham beanland, electricity, kiewa power station, newport power station, yarraville, richmond terminal station, brunswick terminal station, white coal, coal, boronia level crossing lights

Aerial photograph of the Ballarat School of Mines, with establishment date for each building. ballarat school of mines, aerial, buildings, former ballarat gaol, mining laboratory, hillman hall, former supreme court, administration building, ballarat technical art school, former wesley church, ballarat girls technical school, ballarat junior technical school, albert street, grant street, lydiard street south, armstrong street south, dana street

Grey soft covered book with a photographic image of E.J. (Jack) Barker on the front. The contents include family history, teaching at the Ballarat School of Mines, Principal of the Ballarat School of Mines, inaugural Director of Ballarat Institute of Advanced Education, Committees hobbies and travel.e.j. barker, jack barker, winsome barker, ballarat school of mines, ballarat institute of advanced education, ballarat college of advanced education, higher education council, williamstown, edward john barker, footscrat technical school, engineering, joe barberis, baseball, tennis, john barker, queenscliff, david gordon, emine karakan, robby main, dick richards, r.w. richards, laboratory, thermodynamics laboratory, fluid mechanics laboratory, harry arblaster, warren perry, ballarat school of mines museum, derek wooley, ed phillips, ballarat gaol, gaol tunnels, mount helen campus, geoff harrison, lindsay pryor, tree planting at mt helen campus, ballarat technology park, 1870 founders hall, john beaumont, initiations, goon's gift, raft races, bath tub push, centenary appeal, prince charles visit, philip law, fourth university committee, ballarat teachers' college, ballarat school of mines motto, caro conference centre, creswick school of forestry, ballarat hospital nurse education, aquinas catholic teachers' college, family history, genealogy

Photograph of a poster that was hung at the Ballarat School of Mines in 1879.ballarat school of mines, rules and regulations, laboratories, laboratory, william barnard, fees

laboratory equipment, scientific equipment

This Edison Ediphone voice recording electronic business machine is manufactured to suit a small office and is light enough to carry between work and home for use outside normal business hours. It is a dictation machine, also called by the competitor’s brand name ‘Dictaphone’, and is used for recording spoken words that would later be transcribed and typewritten. A wax cylinder would be installed onto the machine’s drum and the Reproducer on the machine would be lowered onto the cylinder. The user would speak a message into a microphone and the reproducer would then convert the sounds to scribed marks on the cylinder. Later, the cylinder could be played and the Reproducer would enable the sound to be amplified through an attached speaker. This machine is currently without its power cord, microphone and speaker horn. Thomas A. Edison extended the technology of the telegraph to his phonograph machine, invented in the late 19th century. It could record and play back sounds of music and voice on a manually operated mechanical machine that used wax cylinders to store the sound. He envisaged the way this technology could be an asset in the office, and he was right! However, most of his phonograph machines were used for entertainment, some for playing lessons, and some for-teaching languages. In 1916 Edison introduced the Ediphone, which grew in popularity after the First World War and into the late 1920s until flat round records replaced the wax cylinders. This Edison Ediphone is significant for improving the way business administration was carried out in the early 20th century, freeing up precious time for professionals and administrative personnel. It was the forerunner of audio tapes and digital technology. The Ediphone enabled letters to be dictated when the time and place suited and reduced the time professionals needed to spend with their secretaries. Secretaries were able to type the letters as they played the recording and they could replay the message if necessary.Voice recorder; a dictation machine; desktop model Edison Ediphone. The electronic machine is in a medal case with remnants of the original grey colour. It has a rectangular base with an A4-sized footprint and a domed hood that retracts halfway into the back of the base. The corners of the base have metal reinforcing, and a short metal bar is on the front centre edge of the lid and the base. A long metal drum is mounted inside the machine. A round device called a ‘reproducer’ is mounted above the drum. There is a folding handle on the left front of the machine and an angled stand with paper guides in front of the drum. A rear cover has the maker’s name stamped on it. An electrical socket with eight pins is recessed beside the cover. Made by Edison.In white letters; “EDISON”flagstaff hill, warrnambool, maritime village, maritime museum, shipwreck coast, great ocean road, edison, ediphone, dictating machine, office equipment, voice recorder, usa, dictation, communication, office machine, dictaphone, speaking phonograph, thomas edison, ediphone voicewriter, voice writer

''News from Bendigo Victoria'' 1972 - 4-page sheet published by The Bendigo Development Committee - various activities and manufacturing initiatives described. Back page article on the restoration and planned opening of the Central Deborah Gold Mine.Published by The Bendigo Development Committee. Printed by Cambridge Press, Bendigo.bendigo, tourism, guide, central deborah gold mine, applied science building, bendigo commonwealth laboratory, d. smyth's & son refrigeration pty ltd., g. w. healey & son, golden city joinery pty ltd., decentralisation program