Improved Methods of and Apparatus for Surveying Trigonometrically, particularly adapted for the Practical Solution of Problems connected with Range Finding and Forecasting, especially Naval Range Finding and Forecasting.

摘要

23,872. Lock, W. H., and Pollen, A. H. Nov. 4. Protractors. -When the range and bearing of a target are known the course of the target is plotted on a travelling sheet 105, moving at a rate proportional to that of the observing ship and marked with a line representing the course of such ship, while a time record is automatically stamped on it. The arm 108 is swung to the bearing angle and a pointer 111 adjusted along the arm to the range when a pricker 112 is operated. The mean line is drawn through the series of marks 115 thus produced. Specifications 6838/02, [Class 106, Registering &c.], and 11,535/04 are referred to.