Details of exhibit
- Exhibition:
- 1897 Forty-second Annual Exhibition of the Royal Photographic Society
- Exhibit title:
- The Bridges-Lee Photo-theodolite
- Exhibitor:
- Louis P. Casella
- Section:
- Apparatus
- Exhibit No.:
- 450
- Description:
- This instrument has been designed for facilitating surveying work. It differs from other photogrametric cameras in the fact that, whenever a photograph is taken (the instrument having been first accurately levelled), there will be recorded on the picture accurate traces of (1) the principal plane; (2) the horizontal plane of the instrument; (3) the magnetic bearing of the principal plane; (4) the principal point of the perspective; (5) a true scale of angular distances right and left of the principal plane. There may also be recorded, at the will of the operator, notes relating to (a) altitude of the station or barometric pressure; (b) station number; (c) serial number of the photograph; (d) descriptive mark of any distant object bisected by the principal plane; (e) date; (f) time, &c. The general idea of the instrument is to secure accurate and, as far as possible, automatic records on the faces of photographs of all, or nearly all, information which may be necessary for their correct interpretation for map-making purposes. A single revolving tubular level at the top of the camera is provided for levelling in any position without any necessity for rotating the instrument.
- Exhibit type:
- Photographic equipment and supplies
- Process:
- [Not Listed] ()
- Award:
- none
