Rail expansion gauge, calibrated against thermometer, degrees Fahrenheit, nil expansion at 100 degrees, for 60 foot rail length, British Railways, copper body, made by Negretti & Zambra, in fitted wooden case marked "P.Way Insp Thirsk" [Permanent Way Inspector Thirsk].
Details
- Object Number:
- 2006-7458
- Materials:
- brass (copper, zinc alloy) and glass
- Measurements:
-
overall: 140 mm x 9 mm x 37 mm, ,
- type:
- rail expansion gauge
- credit:
- Swift, John
