British Thomson-Houston Co aperture cards

The drawer contains c 300 aperture cards of drawings of GEC Witton WT-series motors and other GEC(W) equipment; BTH Rugby and are of electrical machines and details, and Alfred Wiseman & Co Ltd, Birmingham or Grantham (later drawings). Drawing number ranges are X105831 - X133846; X2528745 - X3041799; SKC164921 - Y2528743; G70401 - G36437; AG8741 M - AG28510. Samples are below:

X105831 - 133846 - Drawing Lists

SKC164921 - Socket Cover (crimped)

Y1674401 - Inductor Selsyn

Y2528744 - RTB6032 Commutator Clamp Ring

X2528745 - RTB6032 Shaft

X2955229 - RTB7444 Frame Adaptor

X3041799 - Cast Iron Terminal Box

G36437- Gearcase

G70401- Spiral Bevel Pinion

AG8741 M - Forged Pinion

G22877 - Internal Arrangement of Reverse & Final Drive Unit

AG28510 - Gear Rim