Specimen glass tints for signal spectacles
Specimen glass tints for signal spectacles; three pieces of coloured glass in wooden case; blue labelled "Standard Tints - Mr Ross's letter of April 6th 1915"; used for testing the tints of signal spectacles
Details
- Category:
- Signalling & Telecommunications
- Object Number:
- 1978-8440
- type:
- glass
- credit:
- British Rail, Clapham