Page:The slide rule; a practical manual by Pickworth, Charles N.djvu/122

ix ADVERTISEMENTS W. H. HARLING /Iftatbemattcal, drawing an& Surveying instrument /Manufacturer 47 & 49 FINSBURY PAVEMENT LONDON, E.C. HARLING's No. 2003. "STANDARD" 10", 10/6; 15", 27/-; 2€ HARLING'S No. 2002. "ELECTRICAL' 11", 13/6. 8 .--■ ij- 1 .-" pfe 6 1
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1 1 . 11 .mi •. s P f ■ * y {*{ ® L_ % f 1 • J 9 f— ■— 1 " 11 1 mi . . ■ V Harlin 2004. "CUBING" 10", 15/-; l.V, 32/-; 20", 60/-. HAR LING ? S No. 2005. "POCKET" 5" thin, 6/6. Harlin. ' N. 2006. "POCKET" With Magnifier, 5", 8/6. STUDENT'S SLIDE RULE, made of cardboard, with metal cursor 5", 1/1 ; 10", 2/1 (post free). Other Slide Rules kept in stock— "DAVIS, "FABERS, "FULLER, "LONG SCALE, "FERRY. "PRECISION UNIVERSAL" Also Watch Form— "BOUCHER SYSTEM " "CALCULEX, ' "M. E. CALCULATOR