Abstract
This paper presents an account of the development of the range of stereoscopes produced by Barr & Stroud (Glasgow, UK) during the period between the two World Wars of the 20th century. These instruments were critical to the adoption of simple graphical procedures (such as the Arundel method) for the rapid production of huge numbers of military topographic maps from aerial photography during the Second World War, since they allowed elevation and contour data to be incorporated into these maps without the need for complex and expensive photogrammetric instrumentation. The pivotal roles played in this development by Professor Barr and the young Lieutenant Hotine are highlighted.
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