A digital terrain coder for transferring map data onto paper tape

"A description is given of equipment used to prepare the main input data for predicting the service area of u.h.f. transmitters by computer. Information on contour height and other topographical features as a function of bearing and distance from the transmitter, obtained from Ordnance Survey maps, is coded and punched onto a paper tape. This can be done directly by an operator who is well versed in map reading but need not have any other special training."