service meter comprising a mercury voltameter, the amount deposited being read in a graduated tube, by A. Wright, 1900 Service meter comprising a mercury voltameter 1900
Cine projector SUPA [Single Unit Projection Assembly) Mk. 1 and stand made by British Thomson Houston Co. Ltd., Rugby and Sound Equipment Ltd., London, fitted with Aperful Projection 4 1/2 inch, 114mm, f/1.9 Taylor-Hobson lens. Cine Projector SUPA [Single Unit Projection Assembly) Mk 1 1950-1952