Probably acquired for use in Telegraphy courses run at the Ballarat SChool of Mines between 1875 and 1893. Telegraph relays amplified electrical signals in a telegraph line. Telegraph messages traveled as a series of electrical pulses through a wire from a transmitter to a receiver. Short pulses made a dot, slightly longer pulses a dash. The pulses faded in strength as they traveled through the wire, to the point where the incoming signal was too weak to directly operate a receiving sounder or register. A relay detected a weak signal and used a battery to strengthen the signal so that the receiver would operate. This relay was made by the firm of Charles T. and John N. Chester, two brothers who successfully partnered in New York City. Charles (1826-1880) founded the firm and provided the expert telegraphy knowledge while John (1820-1871) kept the books and managed the business operations.(http://americanhistory.si.edu/collections/search/object/nmah_706518, accessed 25/01/2018)Electromagnetic relay device used in telegraphy. The working parts mounted on a brass plate, attached to a wood base. Equipped with four terminal posts. Adjustable contactor mechanism. This electromagnetic Relay Device was used in Telegraphy at the Ballarat School of Mines. After a special meeting of the Ballarat SChool of Mines Council in 1874, a decision was made to offer instruction in Telegraphy, a subject not directly related to mining. Telegraphy was taught by W.P. Bechervaise, postmaster at Ballarat. On 07 October 1874 the Ballarat Courier correspondent reprted on Telegraphic training: "... these classes ... are a snare and a delusion, as there is scarcely the remotest chance of obtaining employment when the examination has been passed."scientific instrument, telegraph relayer, telegraphy relay device, telegraphy

This item was probably acquired for, and used by, participants in telegraphy at the Ballarat School of Mines courses between 1873 and 1893.An electromagnetic relay device on a brass base plate, and mounted onto a wood base. It is covered by a removable wood-framed glass sided cage. The item has four terminal posts and an adjustable conductor mechanism.ballarat school of mines, telegraphy, relay device, telegraph coding

Walters & Co British Post Office Relay - telegraph current booster.equipment, ww2, general

Found on a wood heap near the tractor shed. Only the top portion remains. The former fixture is the tapered top section of the wooden flagpole that formerly stood at the front of the head keepers quarters. There is a hole with attached metal pulley near the top which allowed for hoisting the flags to signal passing ships. Signal flags were hoisted on the flagpole and were used to communicate with passing shipping. Messages were then relayed by the overland telegraph line to Eden. Remains of black paint provide evidence of the blackout measures implemented during World War 11. The pole is currently fixed to a stand to allow for its display.The pole remnant has second level significance for its historic value and provenance.Top sction of a flagpole. At the top it is tapered and fashioned into a square section. Near the top of the pole is a hole with a metal pulley inside. There is black and white paint flaking off leaving bare wood.