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The labels indicate connections between the switchboard and batteries which power several of its components: O.P. Battery is a misnomer; it stands for "Operator Battery," which powers the operator's voice circuits.
N.A. Batt is where the power hooks up for the Night Alarm system, which rings a bell whenever a customer has requested service.
P. Gen is for an external "power generator" which provides ringing power, saving the operator the need to signal subscriber lines with the on-board magneto. Note the larger diameter wires for the power generator, which is AC instead of DC, and requires enough current to ring remote subscriber station ringer bells.
Also note that someone had jumpered together all three sets of connections. This is incorrect, in that two of them require DC and the third one (power generation) AC power. In the old days, before the electrical grid was established, such power was supplied by DC-powered devices known as pole changers.
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A telephone switchboard, a quilt on an iron bed, and an old treadle sewing machine all date to the early part of the 20th Century.
I found out that Suttle was founded about 1910, and there is still a company by that name in the telephony manufacturing business today.
Based on a piece I found online I think the switch was built about 1915, just about exactly the time the picture of Ailsie Hansell was taken sitting at a similar switch.
Suttle didn't actually manufacture the switches they sold; their niche was to take old equipment and rebuild it. In this case, the board is mostly a Kellogg 50-line board, with a very few modifications by Suttle.
They are the only old-time telephony equipment manufacturer still in the business today of making that type of equipment.
Switchboard at the Erne Hospital: Hazel West, Telephonist, Eileen McGarrigle, Theatre Sister, Benny Cassidy and David Bolton, Director of Community Care.
Source: livinghistories.newcastle.edu.au/nodes/view/41947
This image was scanned from a photograph in the University's historical photographic collection held by Cultural Collections at the University of Newcastle, NSW, Australia.
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01/12/2015, Port of Felixstowe, England.
Maersk Triple E - down below...
Engine control room, main electrical switchboard console.
Keel laid 27/06/2014, launched on 16/01/2015 and completed on 06/05/2015 by DSME, Okpo, South Korea (4269)
194,849 g.t., 194,829 dwt. and 18,340 teu, as:
'Mette Maersk'.
1940 Actress Marie Blake AKA Grandmama Frump from the 60s The Addams Family TV Show - screen grab screengrab humor characters like from newspaper comic strips - Edith Marie Blossom MacDonald also known as Blossom Rock or Blossom MacDonald - Jeanette McDonald's sister from film - Dr. Kildare's Strange Case - playing the character of Sally Hospital Switchboard Operator
Giant switchboard at the Central Terminal. There were 3 or 4 of the black panels, each with about 640 sockets.