[Collection of 415 lantern slides re various aspects of engineering and technology, especially transport. Subjects covered include aerial photographic mapping, railway transport, the electricity grid system, automobile engineering, conveying and handling machinery, the Waterloo and City Railway, tramways, dredgers, the Queen Mary, shipbuilding, gas manufacture, house building, coal shipping terminals, house construction. Slides are 3 1/4" square; few are dated. 6 boxes]