1) "Determination of the Principal Distance and the Principal Point of a camera 
with a 3-dimensional Space Method." 
S. Tanaka (Vol. 12, No. 1, 1973) 
2) "Calibration of Underwater Camera System with Dome Window." 
A. Okamoto and C. Mori (Vol. 13, No. 2, 1974) 
3) "An Approximate Camera Calibration Method." 
Y. Ozaki (Vol. 13, No. 4, 1974) 
Photo-taking works during the period of 1972-1975 in Japan are shown in 
Table I. 
Table I 
scale |1/3,000 |1/8,000 — |1/12,500 [1/20,000 [smaller than 
“ale | 1/5,000 '1/10,000 1/15,000  1/25,000 1/25,000 | 
area km 7,060 | 53,310 |.75,970 | 239,340 | 140,020 
Chapter II 
Aerial cameras and photogrammetric instruments in operation in Japan are: 
22 aerial cameras with aviogon lenses or pleogon lenses which are used only for 
black and white photography. 
60 aerial cameras with aviogon A lenses or universal plogon lenses which are used 
for black and white photography and colour photography. 
43 universal plotters such as Wild A-7 or Zeiss C-8. 
176 precision plotters such as Wild A-8, Zeiss Planimat B-3 or Zeiss Jena Metrograph. 
112 topographic plotters (including Kelsh type plotters) such as Wild B-8, Kern 
PG-2, Zeiss Jena Topocat B, Nikon plotter M-5, Sokkisha double projector, or Kelsh 
plotter. 
24 comparators which are used for aerial triangulation. 
34 orthoprojectors. 
26 rectifiers. 
Photogrammetric instruments developed in this period in Japan are: 
1) Kokusai multiband camera: It has 4 Hassel Blad cameras and 4 different films 
can be used for each camera. 
2) NAC multiband camera: Detailed information is given in the attached paper. 
3) Nikon large scale plotter L-2: Its structure is similar to that of the Topocart B. 
4) Kimoto Geoscope-7000: It is a kind of projector with rectifying facility. 70 mm 
X 70 mm film can be enlarged with the enlargement ratio of 6 x— 18 x and 
projected on the screen. It is useful for revision of a map. 
Chapter III 
In the practice of aerial triangulation in Japan in the period of 1972-1975, no funda- 
mentally new development had been achieved. Now it is seldom that the mechanical 
method is applied and almost all aerial triangulation is executed by the analytical 
method. 
The following papers were printed in the journal of the Japan Society of Photo- 
grammetry: