thelineman wrote:MRFS wrote:in this case the person operating the staff instrument at John Darling would telephone Redhead for a release, and Redhead would contact Belmont. One galvo would flick first, then when Belmont gave a release then other galvo would flick releasing the lock in the instrument. [/size]
I you look at the digrams, the telephone has to be connected, but there is not block bell connected to the intermediate instrument.
Yes - fascinating set of diagrams, thank you for those. 57B shews the intermediate instrument - is 'bobinas compound del rotor de enganche del la guillotina the compound lock (bobinas compound) on the commutator (rotor) - what's 'guillotina' in this sense - cutting off the current? I know that 'cortacorriente' is a switch.
The intermediate works earth and line to 57C and twin line to 57A with telephone across both line wires; so the intermediate (57B) would ring up one end (57A) and then 57A would ring 57C - I'm interested by the campanilla - the extension bells I wonder if they were AC operated or tremblers off the DC?
The other diagram is for central battery working, I think (instead of magneto ringing).