HISTORICAL EXHIBITION 
35 
Exhibit 3* 
Exhibit 4 
Exhibit 5* 
Exhibit 6* 
Exhibit 7* 
Exhibit 8* 
Exhibit 9* 
Exhibit 10* 
Exhibit 11 
Exhibit 12 
Laussedat to show that it was possible to produce a map by means of 
perspective views. 
(Lent by the Conservatoire National des Arts et Métiers, Paris). 
Photograph of Chevallier’s planchette phototopographique, c. 1886. 
The objective is turned by clockwork about a vertical axis. A radial slit 
follows the motion of the objective; it is opened when the motion is 
uniform and closes automatically when the rotation round the whole 
horizon is completed. Azimuthal angles can be measured to five minutes 
(sexag) of arc. 
(Lent by the Conservatoire National des Arts et Métiers, Paris). 
Johnson’s Pantascope camera, 1862/4. 
The camera rotates by clockwork drive on a circle fixed to the head of the 
tripod. Simultaneously the plate is moved sideways so that always a fresh 
portion of the plate is exposed. The plate is contained in a ‘plate carriage’, 
missing from this exhibit, consisting of a frame with two small wheels 
and a flexible cloth cover which is attached to the rotating camera with 
the aid of a metal slit. 
(Lent by the Kodak Museum, Harrow). 
Photograph of Mangin’s Perigraphe, c 1877. 
The horizon is viewed by a toric objective placed with its axis vertical. 
This provides a view of the whole horizon on a horizontal plate. 
(Lent by the Conservatoire National des Arts et Métiers, Paris). 
Photograph of Pelletan’s panoramic camera, c 1900. 
Takes panoramic views on a cylindrical photographic film. The objective, 
whose axis is perpendicular to that of the cylinder, turns uniformly about 
the latter. 
(Lent by the Conservatoire National des Arts et Métiers, Paris). 
Photograph of Pelletan’s panoramic rectifier, for restitution of views 
obtained with his camera (exhibit 6), c 1900. 
Two panoramic views taken with the camera are rolled on cylinders of 
the same diameter. A ruler pivoted about the axis of the cylinder defines 
the azimuth of the point observed. 
(Lent by the Conservatoire National des Arts et Métiers, Paris). 
Plan of Fort du Mont Valérien, 1850. Scale 1 : 5,000. 
This aquarelle was executed by Laussedat on 20th July, 1850, using the 
planchette topographique (exhibit 2). 
(Lent by the Conservatoire National des Arts et Métiers, Paris). 
Photograph of Laussedat’s chambre obscure topographique, 1 859. 
The first phototheodolite with a vertical plate. The instrument was made 
by Brunner, focal length 50 cm, format 24 X 30 cm. 
(Lent by the Conservatoire National des Arts et Métiers, Paris). 
Plan of the village of Buc (near Versailles) made by Laussedat by means 
of the chambre obscure topographique (exhibit 9), 1861. 
(Lent by the Conservatoire National des Arts et Métiers, Paris). 
Paganini’s Phototheodolite, mod 2, 1 884. 
(Lent by the Istituto Geografico Militare, Florence). 
Bridges-Lee Phototheodolite, 1896. 
Contains means by which the photographic image on the plate auto 
matically includes an azimuth scale and an indication of the magnetic 
bearing of the line of sight of the camera. Two tables for recording extra 
data can also be photographed on the same plate. 
(Lent by the Science Museum, London).