| No. 1
Consists of a thin strip of steel cranked at one end and having slots cut along the length at each end. Overall length
4.5". Used for adjusting the armature back-stop of A.T. &
E. Co., S.T. & C. and Ericssons' horizontal-typo relays.
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| No. 2
3" long, having a hole and projecting pin at one end. Used for adjusting the back-stops of Siemens' No.50 Uniselectors.
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| No. 3 For Adjusting Bridge Magnet
Backstop on Plessey & G.E.C. Crossbar Switches.
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| No. 4 For use on quintuple relay
backstop in TXK3 and 4 exchanges.
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| No. 5 For use on the armature
backstop of magnetic counter TXK3 and 4 exchanges.
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| No. 6 For use on Multiple Relay
Backstop on TXK3 and 4 Exchanges.
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| No. 7 For use on Multiple Relay
Backstop on TXK3 and 4 Exchanges.
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