[Quickrip-cvs] a good path is afforded for the lines of force passing from

[Martyn <ma...@an...>]

Armor of spring brass wire in spiral form, and over this a close, stout
braid of glazed cotton. This like the others is reinforced by an extra
braid at the plug end. Ringing and Listening Keys. The general
principles of the ringing key have already been referred to. Ringing
keys are of two general types, one having horizontal springs and the
other vertical. [Illustration: Fig. 266. Horizontal-Spring Listening and
Ringing Key] _Horizontal Spring Type._ Various Bell operating companies
have generally adhered to the horizontal spring type except in
individual and four-party-line keys. The construction of a Western Elec