三標両角法による航跡記録器の試作品とその改良点について(日本航海学会第32回講演会)

抄録

Three objects are A, B and C. The ship's positon is P. This is the instrument by which the ship's course will be recorded on the chart, if one on board is moving index mirror so that image A may be on B through telescope on sextant and the other is moving another sextant so that image C may be on A. Figure 1 shows the principle of this instrument except sextant, where D is the point which AB^2=AC・AD. Take Q and E such that AB^2=AP・AQ, AB=AE. then follows ∠ABQ=∠APB, ∠ADQ=∠APC. Fig.2 shows the outline of this instrument put on paper except sextant. Fig.3, 4, 5, 6 are in detail of fig.2. Fig.7 shows the sextant with synchromotor, (12) shows the cover of syncromotor. Fig.8, 9 shows the part of instrument which must be reformed next time.