With the Hilger & Watts Stereosketch it is easy to transfer essential 
details from aerial photographs to existing maps. It is the ideal 
instrument for plotting of contours, forest growth, urban develop 
ment and for hillshading and general mapping. Easily dismantled, 
quickly reassembled. 
Write for Catalogue CS 137/I.S.P.S. n. 
HILGER & WATTS LTD • 98 ST PANCRAS WAY • LONDON ■ NWi 
Telephone: GULliver 5636 
And at, DORTMUND-HORDE • CHICAGO • TORONTO • MILAN 
CAMERAS • TRANSFORMATION PRINTERS • PLOTTERS • STEREOCOMPARATORS • CALIBRATION GONIOMETERS 
Hw/7