- Objektnummer9548
- UpphovsmanE. R. Watts & Son (Maker)
- BeskrivningInvar tape wound on wooden reel marked 69.5 ft
- Datum1920 - 1925
- Objektnamn
- Material
- Dimensioner
- reel Diameter: 46.3 cm
reel Height: 3.2 cm - Documentation
- 69-5 FTERW&S [in prism]/ TRADE MARK/ E. R. WATTS & SON/ Engineers and Surveyors' Instrumennts and Materials/ 123 Camberwell Rd, London.