STERLING TELEPHONE AND ELECTRIC Co. Ltd
WATERTIGHT MINING TELEPHONE SWITCHBOARD
No. U 572
Watertight Cordless Mining Switchboard in Cast-iron Case. Arranged for Double Lines. The Indicator drops are fitted with Local Contacts and Mechanical Replacement. A revolving Commutator Selector Switch is provided for each Line. A Leading-in Gland is provided for cables.
Supplied in 5, 10, 15 & 20 ways with 3 through positions.
When ordering it is necessary to state whether required for Battery or Magneto.
NOTE: Line Indicators are used for Ring Off signal.
This Switchboard complies with the requirements or the Coal Mines’ Act.
No. U 572a
Gas and Watertight Indicator only, style similar to above but without Switches in a Cast-iron Case. Fitted with Mechanical Replacement Movements. Two Terminals are provided for each Movement. One leading in gland.
Supplied in 5, 10, 15 & 20 ways.
Last revised: April 28, 2021