POST OFFICE ENGINEERING DEPARTMENT — Technical Pamphlets for Workmen. [Group B]. [NEAR COMPLETE SET, WANTING ONE VOLUME]. BRIGHT COLLECTION IN ORIGINAL WRAPPERS

HMSO, 1919[-1938]. 7 vols., [of 8], 8vo., with illustrations and diagrams in the text; original blue wrappers, wire-stitched as issued, a remarkably well-preserved, bright, clean collection. The collection comprises B1: Elementary Principles of Telegraphy and Systems up to Morse Duplex; B2: Telegraph Concentrators; B3: Wheatstone System Morse Keyboard Perforators; B4: Quadruplex, Quadruplex Repeated Circuits and Telegraph Repeaters, Simplex and Duplex; B5: Hughes Type-Printing Telegraph; B6: Baudot Multiplex Type-Printing Systems; B7: Western Electric Duplex Multiplex. Murray Duplex Multiplex. Siemens & Halske Automatic Type-Printing Systems. The set wants only B8: Fire Alarm Systems. GROUP COLLECTIONS OF THIS NOTABLE AND HISTORIC SERIES ARE RARE.