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An engineer and inventor, [32] he founded (with financial assistance from his father [33]) the Philmac company around 1930 [34] to manufacture his "silent press" pushbutton cistern valve. [35] He was president of S.A. Employers' Federation from 1943 [ 15 ] and chairman of the Brass Manufacturers' Association.
Basic Acme thread profile. The Acme thread form has a 29° thread angle with a thread height half of the pitch; the apex (or crest) and valley (or root) are flat.This shape is easier to machine (faster cutting, longer tool life) than a square thread.
Crude versions of conically tapered ground glass joints have been made for quite a while, [1] particularly for stoppers for glass bottles and retorts. [2] Crude glass joints could still be made to seal well by grinding the two parts of a joint against each other using an abrasive grit, but this led to variations between joints and they would not seal well if mated to a different joint.
These and other early online catalog systems tended to closely reflect the card catalogs that they were intended to replace. [2] Using a dedicated terminal or telnet client, users could search a handful of pre-coordinate indexes and browse the resulting display in much the same way they had previously navigated the card catalog.