ATM TELEPHONE T.3030 & T.3031

Of robust and compact design, embodying all the latest and most approved features, and conforming to Coal Mines Regulations.

Broad machine-faced flanges on the cast-iron case and cover, render the telephone flame-proof, whilst the cover is secured by triangular-headed bolts, only removable with the special key illustrated.

The cover is bodily detachable without disturbing fixed electrical connections.
A terminal compartment, protected by an inner flame-proof cover, accommodates the terminals, and provides for the entry of external wiring. There is accommodation for armoured cable glands if required.

A five-magnet generator is fitted, and the telephone is adapted for bridging work. The generator mounting is adjustable for accurate alignment with the driving handle, which is counterbalanced.

The loud-speaking receivers are metal cased, and the connecting cords protected by braided steel armouring, securely anchored to glands at either end.

The polarized magneto bell is housed in a separate compartment, and can be removed without disturbing fixed connections.

All components are readily accessible for inspection, adjustment, or removal, and the electrical insulation throughout is of a high order.

A box spanner, to fit the triangular headed fixing bolts, is supplied with each telephone.

Can be fitted with armoured cable glands if required.

T.3031 - L.11205 (Two Receivers)
Finish: Dark green enamel.
OVERALL DIMENSIONS:
Length, 2ft. 3ins. width, 15.5ins. depth, 7ins.
Weight, 65 lbs.

T.3030 - L.11204 (One Receiver)
Finish: Dark green enamel.
OVERALL DIMENSIONS:
As above
Weight, 63 lbs.

Taken from the ATM Mine Telephones and Signalling Apparatus Catalogue 1928

Last revised: October 06, 2012