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Opposed measuring faces, a calibrated screw and a graduated index wheel turn a small movement into a reading. Inspect the scale, measuring contacts and adjustable work supports.

Sources and model notes

The analog scale is linked to the modeled spindle position. It illustrates a reference setting, not a certified measurement of an aircraft part. Exterior dimensions remain qualified where the catalog supplies no dimension.

Pratt & Whitney Super-Micrometer catalog plates · archived by Lathes.co.ukPratt & Whitney · A History, 1930, page 85

The Pratt & Whitney machine-tool company and Pratt & Whitney Aircraft are distinct businesses. Sources establish the scope of each equipment study; this shop layout is interpretive.