MAPPING IN NEW ZEALAND SINCE 1931 1931 - Survgrid

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A Draughtsman’s Dream of Aerial Surveys –A Draughtsman s Dream of Aerial Surveysby Gordon Redward
All of the following instruments, untilthe arrival of the Multiplex, combineda mirror stereoscope with a parallaxmeasuring device. When readingheights or drawing contours,correction graphs had to be used tocompensate for the effects of tilt inthe photos.The instruments were used only forreading spot heights and contouring.Stream patterns and cultural detailwere established using the Arundelmethod of radial line plotting.
Page 2 and 3: 1931Bob Crawford’saerial mappinge
Page 5: N.134 -- 1st first Provisional NZMS
Page 9 and 10: 1935Barr & Stroud ZD10 precision st
Page 12 and 13: The Cambridge Stereocomparator -The
Page 14: The ‘Bitsa’ - put together by s
Page 17 and 18: The members of staff and visitors w
Page 19 and 20: The beginnings of the Photo Laborat
Page 21 and 22: Xmas1946
Page 24 and 25: Xmas1947
Page 26 and 27: The Multiplex was the first pieceof
Page 28 and 29: AnaglyphprojectiononMultiplex
Page 30 and 31: 1948 -- Fair Isle’s in fashion!Bo

MAPPING IN NEW ZEALAND SINCE 1931 1931 - Survgrid

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