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838 St. Paul Street 
Rochester 2, N. Y. 
BAUSCH & LOMB 
BAUSCH & LOMB OPTICAL CO 
Balplex Plotter 
Purpose: Optical Multi-Projection type Photogrammetric 
Mapping Instrument. 
Size: Projector Principal Distance 55 mm. 
Optimum Projection Distance 525 mm d= 100 mm. 
Model/original photograph 3.43 magnification. 
Diapositives printed with 153/55 Printer. 
Tracing Table Measuring Range 125 mm exclusive of 
extensions. 
Diapositive Size 110 X HO mm. 
Use: This instrument is used for production of topo 
graphic maps from 6" (153 mm) aerial mapping photo 
graphy. Vertical, convergent (up to 20°), and oblique 
(up to 60°) photography can be accommodated. 
Fittings: Used with 115 Volt AC Electrical outlet. 
Price: On request. 
SURVEY SECTION 
The Decca Navigator Co. 
Ltd., 247 Burlington Road, 
New Malden, 
Surrey, England. 
/ 
Prices and Hire Charges. 
Available on application. 
DECCA NAVIGATOR 
The Decca Navigator System 
Purpose: Aid to navigation, tracking, fixation. 
Essential Units: For survey use the Decca chain comprises three port 
able Transmitting-stations giving a range of 30-300 miles depending 
on accuracy requirements, size of stations etc. Each user carries a 
receiver giving fix data in terms of two dial readings which are plotted 
on a specially gridded chart. 
Receivers are supplied in versions for air, marine and ground use. The 
Flight Log and marine Track Plotter, driven by the receiver, record 
and display continuously the position and track. A Two-Range version 
of the system is available for marine use, employing two stations ashore 
to which the shipborne equipment measures the direct distances. 
Applications: Airborne photogrammetry, geophysical survey and re 
connaissance; hydrography and marine oil exploration; terrestrial geo 
physical survey and reconnaissance; special projects, e. g. calibration of 
air navaids, cablelaying, air and marine speed and manoeuvrability trials. 
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