Screw thread comparator, used at Cockatoo Island Dockyards, plastic/metal, Ovee Spring Gauges Ltd, Edgware, Middlesex, England, 1952
A thread measuring gauge consisting of an upper, middle and lower measuring bar, measuring scale (marked in inches and millimetres) and a cover/adjustment/tolerance adjusting screw. The pitch measuring coils, which are a separate item, are missing. The whole in metal casing, painted brown.
(-1/1) Screw thread comparator, curved measuring gauge viewer on rectangular base
(-1/2:1/3) Screw attachments to springs.
Manufacturer's plate fixed to front of instrument, engraved " "OVEE/ [logo]/ SCREW THREAD COMPARATOR/ PATENTS PENDING/ OVEE SPRING GAUGES LTD/ EDGEWARE MIDDLESEX."