We thought, the possibility of application of the aerial photogrammetry to our hydrographic surveying is very high. In practics, owing to our efforts, it has become possible in our office from 1963, to deside the position of hydrographic controls by the analytical aerial triangulation. Generally speaking, the occupation-rate of sea surface in photoimage for the aerial photographs utilized in the analytical triangulation on the hydographic surveying area is comparatively large. We assume the aerial photographs that its occupation-rate of sea is 100%, and if in the triangulation by the series contained these aero-photographs, the cantilever process will be possible in the ordinary accuracy, we could carried out hydrographical triangulation more economically.
In 1967, we had a plan of the first experiment as for the over-sea aerial triangulation in Tokyo Harbour. The result of this experiment was considered to be satisfactory, but in order to investigate the essential problems, that is, the phenomena of error propagation in the over-sea triangulation, we made the simulation on the over-sea triangulation. This paper reports a practical results in Tokyo Harbour and a part of the results of the simulation, as for the over-sea analytical aerial triangulation.

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A design is described regarding a new restitution instrument. Characteristics of the instrument are as following :
(1) non-tilting projectors of the instrument,
(2) fixed optical system,
(3) minimum elements of relative orientation: two swing, oneX-tilt of left projector, oneY-tilt of right projector andZ-motion.
Chosen the elements of orientation as (3), only one tilt about one axis for one projector is sufficient for the relative orientation, which simplify the mechanism of the instrument.To accomplih (1), the instrument is constructed as illustrated in Fig. 3 by means of the stereo-gram. In this figure, ABis a horizontal rotation axis about which a device ABCDEF is rotated. Two guid railsEF, CDare fixed to the device so that the carriagePQTUbe able to move along the rails. The carriage is moved by the guid rodGRwhich is through a sleeved pivotRfixed to the middle of the carriage. A short spindleTUattached also to the carriage, the endSof the guid rodSAmove along the spindle, another end of the rodSAis through the sleeved pivotHfixed to the negative carrier by a gimbal system.
The movementS, or the tilt of the rodSAregarding to the rodRG, corresponds to a tilt of the projector. The verification is shown in Fig. 5 and formula (1) - (6) .

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