Left: A very early Type A , with Ader receivers and early Hunnings (?) transmitter. Photo courtesy Marco Laudani
Left: New Phonopore Company Type A, probably late 1880s. This one has been refitted with WE receivers, and is numbered A120.
Left: Type EST, early 1900s from New Phonopore Co. It was designed to work across poor lines such as fencing wire "on Cattle Ranches, farms, etc" and ring on low currents. It is externally similar to the basic Type R that was used to form railway multi-point party lines by code ringing, and the Type A used mostly for point-to-point work. A cutdown version without the howler was the Type A Block Connector. This used the existing railways signalling circuits to signal a call.
Left: Type A, revised by Sterling, 1912 pattern. Note the smaller case
and modified howler, which now uses the Resaphone .
Left: Type S "Selective Telephone" with pushbutton signalling for up to 12 phones. This phone needed a two wire circuit, but would only signal one phone at a time - this did away with the need to constantly monitor the code ringing in busy signalboxes. Unlike most Phonopores it was not intended to be superimposed across a telegraph line.
Left:: Australian Post Office's No. 41.
Right: Alternate APO rebuild, retaining many of the original Phonopore parts.
Photos courtesy Marco Laudani
Left: Collier-Marr howler. It was also offered by Phonopore as a dictation unit from the manager's office to a stenographer's desk.
Left: Kellogg transmitters