15 
16 
13 
Stand 102В—cont. 
experimentation and development, not only in manufacture, but also in 
use and application. The most recent discoveries in the Applied Sciences 
have also been adopted for improvement of design. 
Each instrument produced is conceived as a complete unit in itself having 
a function and use in any modern Survey Organisation. The instruments, 
however, are related one to the other by a leading principle such that they 
are complementary. Since Ing. Nistri has always pursued an approach 
bearing in mind both the technical requirement of design and those of the 
user, economic as well as scientific considerations have been catered for. 
That is to say, the question of accuracy has been related to economics 
such that for each type and scale of survey work there is an appropriate 
instrument, from those of extremely high accuracy required by General 
Survey Offices and specialised engineering work, to those with wider 
tolerances adequate for middle and small-scale cartographic work. 
Features which are common to several instruments include the following: 
Each instrument is designed for use in connexion with modern wide- 
angle cameras although photographs taken with cameras of any type can 
be handled; in this way universality frequently required in practice is 
retained. Particular, cases can always be solved by the use of the ratio 
printers which can be termed the common denominators of the individual 
units of the range of instruments. 
In each plotter the floating mark is presented by a luminous point. This 
has proved to be more accurate than the opaque mark, besides being more 
obvious and comfortable in use. 
The Electro-coordinatograph units eliminate the need for any mechanical 
transmission in the Nistri instruments. By means of these units the 
control spindles, as well as the corresponding screws of the coordinato- 
meter, eoordinatograph, etc., rotate simultaneously through a servo 
mechanism which is operated electrically. The displacement of the 
floating mark on the space model is also obtained by means of electric 
motors, thus eliminating prolonged and fatiguing operation of hand- 
wheels by the operator. Two of these displacements (XY, YZ, ZX) can 
be controlled by means of a device designated the Veltropolo. This auto 
matic control orientates the displacements in any direction through the 
rotation of a handwheel similar to a steering wheel in a car. Each individual 
displacement can furthermore be separately controlled by means of other 
handwheels or knobs, the Z displacement in elevation being controlled by 
a foot treadle. 
Over the period of the last two years O.M.I. has supplied over twenty 
Nistri ТАЗ Stereocomparators to large European and American mapping 
organisations, the design of these instruments having commenced in 1953. 
With this instrument O.M.I. was the first manufacturer to offer an 
equipment suitable for students and practitioners in the new methods of 
analytical aerotriangulation. O.M.I. are continuing with further new 
developments of equipments in the field of analytical photogrammetry. 
principles with which Ing. Nistri started, embody the result of forty years’ 
14 
Stand 102B—cont. 
Other photogrammetric instruments manufactured by O.M.I. are: 
“Nistri” Foma Aerial Camera Model 54¡A. A wide-angle film camera, 
format 23 cm. x 23 cm. (9 in. x 9 in.), with O.M.I. Rigel lens f = 152 mm. 
(6 in.), 1 : 6-3, 120 m. film magazines. 
“Nistri” Photomultiplex Model D III. A plotter and spatial triangulator 
of the second order, with anaglyphic stereoscopic viewing. 
‘W/i/ri” Stereographometer Model 90. A plotter of the third order, with 
stereoscopic binocular viewing and horizontal parallax measurement. 
Plots in photographic perspective or planimetric projection. Continuous 
plotting scale from 1-5 to 0-15 times. 
“Nistri” Orthoseopic Printer. For ratio prints of film or plate exposures. 
“Nistri” Electric Coordinate Assemblies. In addition to electric coordinate 
assemblies already designed for use with “Nistri” or any other type of 
plotter, O.M.I. also makes units for the automatic recording of coordinates 
on paper, tape or cards. 
Accessories for Photogrammetry. Stereoscopes, stereoscopic spectacles, 
monocular comparators, etc. 
N.V. Optische Industrie “De Oude Delft” STAND 103 
Oude Delft 36, Delft, Holland Examination Hall 
Gordon Square 
Representatives: J. de Groot Second Floor 
C. M. Snijders 
Exhibit 
“Old Delft” Scanning Stereoscope ODSS III for photographs up to 
9in.xl8in. Scanning of stereoscopic field by two knobs. Parallax 
correction incorporated. Magnifications 1-5 and 4-5. Simultaneous 
interpretation of the same prints with two stereoscopes. 
“Hansen 1 ’ processing unit. For roll films up to 100 ft. with patented open 
spoke-type processing reel. 
ii HOCA-2>5 horizon camera.” With concentric lens system covering 
practically the entire horizon: 355°xl4°. Capacity: 100ft.x35mm. 
roll film (45 exposures). Lens and film remain stationary during exposure. 
Angle-true reproduction of photographed area. Incorporated graticule 
permits direct mapping of the data, thus enabling much faster chain 
surveys than were hitherto possible.