Pattern 541 Navyphone
As shown in Torpedo Drill Book, 1914. Presumably, the little circle at upper right is the call-up button, but this was actually located on the left side.[Inference]
The Royal Navy's Pattern 541 Navyphone was a refined little handset model suitable for use in cabins. It replaced the clumsy cabin model derived from the Pattern 2108A Navyphone[1] It was first used in Bellerophon.[2]
Form Factor
The case was oval-shaped and would be mounted on a bulkhead[3] with its long axis vertical. It dimensions may have been about 130mm across and 200mm tall.[4]
It featured a hemispherical bell on the front of the case and an angled handset with transmitter and receiver hung on a hook on the right hand side. The hook made the ringing circuit when the phone was hung up. The handset also featured a "speaking circuit break", which might mean a push-to-talk push or switch.
A small circle on the diagram might be the call-up push button.[5]
Service Life
The phone was fairly short-lived, as the Pattern 2463 Navyphone was used in Orion in 1911 or so[6].
See Also
Footnotes
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