This box contains British Thomson-Houston Co Ltd (Rugby) negatives in small thin translucent envelopes, in the following drawing series, and have been arranged in the following numerical order 566201 - 566499, 570615 - 576432, 581900 - 583200. One or two sample drawings from each batch are detailed below.

566201 Electrical layout of Central Argentine motor coach, ordered 1925

581925 Section BTH 508 motor

582151 Pinion drawing tool

582596 Control connection box

582779 Panel for auxiliary fuse box

582905 Arrangement of collector shoe

582913 BTH 265B motor frame

582914 Layout of axle suspension

582972 BTH 509 bearing withdrawal tools

583035 Gearwheel for BTH 507 motor