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

A black and white photograph of Lt Colin Scott DFC,shows Capt Dick Niemela an American Forward Air Controller, the area coordinates, of a large NVA/VietCong force. Scott had flown over the emeny, under heavy fire until he had almost run out of fuel. Also in the group is Lt Mike Meehan 161 (Indep) Recce Flt.A black and white photograph of Lt Colin Scott DFC,shows Capt Dick Niemela an American Forward Air Controller, the area coordinates, of a large NVA/VietCong force. Scott had flown over the emeny, under heavy fire until he had almost run out of fuel. Also in the group is Lt Mike Meehan 161 (Indep) Recce Flt.photograph, lt colin scott, capt dick niemela, lt mike meehan, 161 recon flt, nva/vc, gibbons collection catalogue, american forward air controller

Photograph of Council Truck used by Air Raid Precaution during World War 2caulfield, air raid precaution, caulfield council, world war 1939-1945, trucks

Photograph of Council Truck used by Air Raid Precaution during World War 2caulfield, air raid precaution, caulfield council, world war 2, trucks

Item issued to Murray Metherall 35455. Refer Cat No 590.2 for his Service History.Hat, bush, floppy, cotton, green colour with metal air holes around crown.uniforms - army, costume - male headwear, bush hat, floppy

B&W photo showing two WW2 era Wirraway fighter planes in the air.photographs, raaf, wirraway

Classic post-war guide for organisers of parties for young children, this book includes planning for everything from invitations to entertainment and food and a variety of games. The accompanying small envelopes appear to be clues to a treasure hunt.63 p., paperback, includes handwritten rhymes on 6 small air mail envelopesgames, children's parties, parties, joyce nicholson

Large object with air pipe and pressure gauge. Large metal gear Has ValvesNew Century auto electric carbonator Cowser Menck & Co makes Melb & Sydney

White helmet with black visor. Worn by army, navy and air force pilots in Vietnamflying helmet

Steel food container with ten small air vents at top of sides (no lid with item)7330-66-028-6012. Food Container, Delivery w/lid. Camp Earmark Bandiana Log Grpfood container

Bone firgure with arms in the air holding word 'free', a Kiwi ar his feet'Free'model, 'tribute 08', nz

Construction of Lake BellfieldColour Slide; Showing the rubble from an exlposion with smoke or dust still in th air

Used in 1950’s to power machinesSign at front “ Southern Cross “ $ Green in colour. Mark AX-C1 Air cooled$. An S with a cross is on the drum

Heavy rainfall is likely to blame for the distressing sight of fish gasping for air at Blackburn Lake.Heavy rainfall is likely to blame for the distressing sight of fish gasping for air at Blackburn Lake.blackburn lake, fish

US Army Air Force flying suit (U160) with name patch JC Pattuniform, 2010

Cameron and Sutherland was a Machinery supplier of this era and probably distributed locally made outboardsSingle cylinder air cooled 2 stroke Villiers motor 31/2 HP291X15450 Cameron and Sutherland Salesoutboard motors, villiers motor, 2 stroke, single cylinder

Wal Jack often prepared letters to bodies asking for historical details as part of his research and writing of articles. This letter responds to historical questions about the former Buninyong railway line and other shire details such as the population of the Shire. Signed by the Shire Secretary.Demonstrates a letter from the Shire of Buninyong.Letter - type on pre-printed letterhead, quarto sheet with a Westerlec Air dried watermark.letter, wal jack, buninyong, railway lines

6 sided glass bottle with a green tinge and several air bubble flaws in the glass.Empire Co. (x 2). Registered Robert Harper & Co. 9.2.91bottles, containers

Colin A Goldberg b 13 November 1932 - D 2February 2013. Colin attended several primary schools in Victoria leaving school aged 13 years. Working hard at various jobs Colin studied at RMIT qualifying as builder /carpenter in 1961. Colin was called up for National Service on 30 July, 1951. He was allotted to the RAAF, and underwent recruit training at Laverton. From there he went to the ground and air radio school in Ballarat. After his training Colin was placed in the RAAF reserve. Colin was on the list for Korea for 9 years although did not serve. Colin said of his training: "My National Service Training showed me purpose & a discipline that turned my life somewhat around for the good & for all time". Colin first joined the family of R S L at WARRAGUL in 1992 transferring to Lara in 1996. Elizabeth, Colin's wife, says that he was probably working with members of the RSL and that talk at work about the branch made him think that it was a good place to connect and make friends, and this was part of the reason why they continued at Lara. Colin. And wife Elizabeth came to live in Lara in 1994 there being a warm welcome for us both by the members of Lara RSL in 1996. Colin & Elizabeth found friendship & a whole wide window to the consequence of warfare. Indeed history written through the suffering of so many . Colin & Elizabeth were married for 57 years when Colin died. Colin and Elizabeth had two daughters, three grandchildren, and three great grandchildren however he never met them. Personal Story A willingness to put oneself in readiness for the call to arm oneself in the defence of family and Nation .Sepia image of Telegraphist A37084 Colin A Goldberg Cream Mount Black Frame. Colin is standing on the steps of hut number 199 at Ground and Air Radio School RAAF Ballarat A37084 Telegraphist Colin Arthu Goldberg. 1st National Service Intake. RAAF. 1932-2013.sepia photograph, korea, 1951, laverton, ballarat, raaf reserves

Medals WWII, mounted miniature medals. Distinguished Flying Cross; Air Force Cross; 1939/45 Star; Atlantic Star; Air Crew Europe Star; War Medal 1939/45; Australian Service Medal 1939/45

Comprehensive Operation Report containing all aspects of OP Aright 88 in the Gulf of Carpentaria region of Queensland. Chapters include: General Information, Operations, Operational Support, Admin and Logistics, Communications, Conclusion and Recommendations. There are four Annexes, Area of Operations, Technical Summary, Nominal Roll, Det 1 Fd Svy Sqn and Air Support Contact Details.Unbound A4 Paper Report held together by a staple top LH corner. Typed pages and diagrams. 6364.1 is copy number 11, 6364.2 is copy number 12 6364.1 is copy number 11, "FOR AIR SURVEY RECORDS" "Tech WO", "Aero Trig", "ADJ", "SGT REES for Records" 6364.2 is copy number 12 "Placed on File and circulated", "Circular Received 15 Feb 1989" on back page. royal australian survey corps, rasvy, fortuna, army survey regiment, army svy regt, asr

The Civil Air Patrol is the official USAF auxiliary. Formed during WW 2, it is currently tasked with search and rescue, communications, civil defense and aerospace education (via the CAP Cadet program) The Civil Air Patrol, while formed in WW2, became the auxiliary of the USAF when the air force was formed as a separate service in 1947. The uniform is based on the USAF uniform with distinguishing CAP insignia and badges. It is unusual to find CAP items in collections.Blue-grey wool serge USAF peaked hat with black patent leather peak (with light grey underside). Black leather chin strap secured by two 16 mm diameter metal buttons embossed with the USAF insignia. Dark blue hat band. Mid grey head band and light tan lining. Maunufacturer's label stapled and sewn to head band. Metal tab support for front of crown and metal strip reinforcement to edge of crown. Civil Air Patrol pressed copper alloy cap badge incompletely attached to hat. Manufacturer's Label - "100% ALL WOOL. EXCLUSIVE OF ORNAMENTATION. MFG WPL. No. 9379. 7 1/8. headgear

Uniform issued to Arthur Thomas MANLY No 431130 RAAF. Arthur enlisted on 21.5.1943 age 18 years. He trained at various places, some including Narrandera, East and West Sale and Rathmines. On 8.6.1944 he was posted as an Air Gunner and on 8.12.1944 he reached the rank of Flt Sgt. He flew his first Operational flight at sea with No 2 Sqd RAAF on 21.12.1944. He embarked for Balikpapan on 12.6.1945 with 2 Sqd Mitchell Bombers. He flew 19 Operational sorties which included 5 strikes and attacks. He was discharged on 22.1.1946 with the rank of WO11.RAAF Staff Sgt, service jacket, blue. Chest (L) has 2 x WWII ribbons & Air Gunner's Badge buttons are darkened brass. Light blue cloth eagles sewn on each shoulder. It has 4 pockets & the waist belt is stored on rear of jacket in loops. Trousers not included.uniiform, raaf, ww2

One of a collection of over 400 photographs in an album commenced in 1960 and presented to the Phillip Island & Westernport Historical Society by the Shire of Phillip IslandPhotograph of Miss Heather West in Air League uniform taken in 1954 during Royal Visit.local history, photography, miss heather west, black & white photograph, air league, phillip island, john jenner, bryant west

Bottle green glass cylindrical of uneven shape with air bubbles and lines down side of bottle.flagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill, flagstaff-hill-maritime-museum, maritime-museum, shipwreck-coast, flagstaff-hill-maritime-village