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Aviation History
1943
1943 - 2293.PDF
SEPTEMBER 23RD, 1943 FLIGHT Advertisements. 11 PRECISION SPUR 9 HELICAL GEAR FR PITCH (DP) 4 *5 6 7 8 9 10 12 12 14 14 16 16 20 20 OM OVERALL DIAMETEfl (INCHES) 4 y/z 3l/4 •3 3 3z\ 2 2%w 2^ \\ 2^ 1% 2^ STO LENGTH (INCHES) 4 3^ 3'4 3 3 3 234 2 234 1^ 2^2 ZH \\ 2% CK BORE (INCHES) I>4 IM IM IM l>4 IM * l>4 u IM % Ik More work — faster work — and maintained accuracy over a greater number of gears than is otherwise possible is guaranteed by a super-hardening process to which all "David Brown" hobs are subjected after the final grinding. These hobs are easily distinguishable by the slightly matt finish which is inherent with this process. JL All " David Brown " standard hobs are made to B.S.S. tooth proportions, 20° pressure angle and are right hand. BROW DAVID BROWN&SONSwDERSFiEiD LTD HUDDERSFIELD ENGLAND
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