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Description: | Black box containing 10 metal components, slotted two at a time in 5 spaces inside box; components are for checking the effective diameter of external screw threads; different sizes are each labeled, 'T.P.I. 4.5-7; tpw 8-13; tpw 14-20; tpw 22-30; tpw 32-40'; sticker inside reads, Ser.No 1970, Calibrated 22/6/87, Valid until 22/6/88; box is lined with purple velvet with makers label imprinted, 'Marlco Thread Measuring Parallels Pat. No. 555830'; box is hinged with small clasp; labeled on outside, '1970 Whitworth' | License: | http://www.abdn.ac.uk/historic/Copyright_terms_conditions.shtml | Publisher: | ABDNP University of Aberdeen, Natural Philosophy Collection of Historical Scientific Instruments | Rights holder: | 47718 | Temporal: | 1950-1970 | Source: | University of Aberdeen | Creator: | Marlco | Identifier: | http://calms.abdn.ac.uk/Geology/dserve.e... | Go to resource |
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