Original "Radio Telegraph Transmitting Sets" Type SCR-74, SCR-74A - Signal Corps Radio Pamphlet No. 1. Covers spark gap sets SCR-74 and SCR-74-A for use between regiment and brigade headquarters. 12 pages, dated October 18, 1918. Good to very good condition with callsign 8EU stamped on front cover - see photos. Pamphlet size is 4.5" x 7.0".