Signal Training Volume III, Pamphlet No. 4, Switchboard Field 10 Line Mark 236, 1929

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Signal Training Volume III, Pamphlet No. 4, Switchboard Field 10 Line Mark 236, 1929 - Title page.jpg
The Signal Training Volume III, Pamphlet No. 4, Switchboard Field 10 Line Mark 236, 1923 Reprint with Amendment 1 1929 was issued by the War Office. The pamphlet is 20 pages long and gives a general description of the set, a technical description, operating instructions and detailed instructions for connecting the unit.

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