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Exhibit 
This is the first firm in Sweden to use advanced pho- 
togrammetry in road planning. A stretch of Swedish 
National Highway 5, which is soon to be reconstructed, 
has been selected as an illustration of the work of 
Kjessler & Mannerstrâle. The present road runs along 
Lake Landvetter on a narrow strip of land, and on the 
other side a mountain rises steeply 30 to 40 metres, 
reaching a height of 100 metres. The road carries 
very heavy traffic, which in combination with the 
terrain creates severe obstacles to terrestrial surveying. 
The work has been based on aerial photographs taken 
from heights of 4,000 and 650 metres. The exhibited 
maps and drawings are plotted on scales varying from 
1:2,000 to 1:200. 
Activities and Products 
Ivjessler & Mannerstrâle is a firm of consulting engi 
neers active mainly in civil engineering and architec 
ture. The staff numbers about 170. 
This firm has had its own mapping department for a 
long time. The task of this department is partly to 
supply the other departments with maps and partly 
carry out mapping assignments. The company did 
photogrammetric work for many years with the aid 
of hired instruments. In 1955, a Wild A7 autograph 
was purchased. Kjessler & Mannerstrâle’s photogram 
metric activity is devoted chiefly to drawing large- 
scale maps for projecting roads and to reconnoitring 
alternative routes directly in the stereomodels. Photo 
interpretation and measuring of profiles are essential 
features of the reconnaissance work. The photos are 
ordered from the Geographical Survey Office. 
48. Wideroe’s Flyveselskap og Polarfly A/S. 
Kr. Augustsgt. 19, Oslo, Norway 
Representatives 
V. Skappel 
H. Skappel 
A. Grydeland 
S. Kjellberg 
S. Svindland 
Exhibit 
Maps and photographs. 
Activities and Products 
Wider0e’s Flyveselskap og Polarfly A/S was founded 
in 1935 and specialized in photogrammetrical survey 
in large and medium scale. The company does all air 
photography for photogrammetrical mapping in Nor 
way, and its library of air photographs now exceeds 
175,000 negatives. Widerpe’s operates 2 Wild A6 plott 
ing machines, 1 Wild A5, 2 Wild A7, and 1 Wild A8. 
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49. Canadian Aero Service Ltd. 
348 Queen Street, Ottawa, Ont., Canada 
Representative 
Dr. J. M. Zarzycki 
Exhibit 
The exhibit shows the company’s ability to perform 
aerial photography, large and small scale topographical 
and planimetrie maps, electronics control survey like 
shoran and radar altimetry on a world-wide basis. 
Activities and Products 
Aerial photography, shoran control, radar altimetry, 
topographical and planimetrie maps, mosaics, airborne 
magnetometer and scintillation counter surveys, and 
helicopter services. 
50. ISP and OEEPE.