HISTORICAL EXHIBITION 
37 
Exhibit 24 
Exhibit 25 
Exhibit 26* 
Exhibit 27* 
Exhibit 28* 
Exhibit 29* 
Exhibit 30 
Exhibit 31 
Exhibit 32 
Exhibit 33 
Fourcade in South Africa developed a somewhat similar measuring 
stereoscope. 
In Fourcade’s measuring stereoscope, of which this is the original model, 
measurements were made relative to grid scales impressed on the photo 
graphic plate in his field camera (exhibit 18). 
(Lent by the University of Cape Town). 
Paganini’s moving-centre protractor, 1884/9. 
This mechanically traces visuals observed in the field with the photo 
theodolite, for the purpose of determining the station points. 
(Lent by the Istituto Geografico Militare, Florence). 
Paganini’s graphical-sector of directions, 1884/9. 
This was the first mechanical mapping instrument for the planimetric 
determination of points directly from photographic-image co-ordinates. 
(Lent by the Istituto Geografico Militare, Florence). 
Reproduction of Paganini’s photogrammetric map - “Saggio di relievo 
fototopografico: Le Cave di Colonnata”, 1878. 
(Lent by the Istituto Geografico Militare, Florence). 
Reproduction of Paganini’s photogrammetric map - “Rilievo fototopo 
grafico della Serra dell’Argentera”, 1879. 
(Lent by the Istituto Geografico Militare, Florence). 
Reproduction of Paganini’s photogrammetric map - “Rilevamenti foto- 
grammetrici di oltre frontiera A1 Monginevro”, 1891/2. 
(Lent by the Istituto Geografico Militare, Florence). 
Panel illustrating phototheodolite surveying in Canada, 1886. 
The method of survey used in the railroad belt in British Columbia and 
Alberta. 
(Lent by the Surveys and Mapping Branch, Department of Mines and 
Technical Surveys, Canada). 
Thompson stereoplotter, 1908. 
Designed to enable the map positions of a series of points to be plotted 
direct from stereoscopic observation of a pair of photographs taken in 
the same vertical plane, and to permit the actual heights to be read off on 
a scale. 
(Lent by the Science Museum, London). 
Aerial Surveying up to the Early 1920’s 
British hand-held aerial camera, type A, 1915. 
The first type of aerial camera used by the Royal Flying Corps. It was 
operated over the side of the aircraft, being held in the observer’s hand. 
Focal length of lens, / = 8 in. 
(Lent by the Science Museum, London). 
British aerial camera, type E, 1914/18. 
Similar to type E B, the first British type of metal aerial camera, except 
that the lower portion of the camera is cylindrical and it is designed for 
a lens of shorter focal length. 
(Lent by the Science Museum, London). 
British semi-automatic plate-changing aerial camera, type L, 1916. 
The process of changing the plates and setting the focal plane shutter is 
one operation performed either by hand or by power derived from a small 
airscrew driven by the slip stream. The exhibit is a slightly later model 
designed for remote control. 
(Lent by the Williamson Manufacturing Co Ltd, England).