Gravity protractor e.g. for determining flight path deviations, has rifle pivotable about central pin with recess provided in upper half of protractor, and weight in lower half provided around optimal force of gravity
摘要
<p>The force of gravity protractor (1) has a rifle (8) pivotable about a central pin (2). A recess (5) is provided in the upper half of the protractor, and a weight (6) in the lower half provided around an optimal force of gravity. A scale (3) and degree pointer (4) is arranged at the rifle so that in the horizontal position it points to zero degrees.</p>
