Significance
Yields information about the construction of the BTPS sub-station at the depot.
Physical description
Set of 3 AGFA blue and white plastic mount 27mm square slides of work on BTPS isolating transformer and sub-station and depot storage - c1974. See btm3017 for other photographs.
.1 - Frank Hanrahan working on the transformer with one his son's observing.
.2 - ditto
.3 - Main switch and transformer in position.
Inscriptions & markings
Various notations by John as to the slide number and the trams in pencil and ink.