Light from the bottom edge of the Sun's disk is refracted more than light from the top, since refraction increases as the angle of elevation decreases.
22.
To obtain the appropriate " charge " for the required range and angle of elevation, the gunner removed and discarded one or more rings before loading.
23.
For practical purposes it is bipolar with angles of elevation, azimuth and binocular parallax ( based on the separation of the two eyes ) are interchangeable.
24.
Gunners controlled the range of their cannon by measuring the angle of elevation, using a " gunner's sights, therefore, even with measuring tools, aiming was still largely guesswork.
25.
By varying the gun s angle of elevation with respect to the target vacuum chamber, impact angles from 0?to 90?relative to the gravitational vector are possible.
26.
From these, using astronomical theory, it calculates the direction of the sun as seen from the mirror, e . g . its compass bearing and angle of elevation.
27.
Ideally a radar tower is built on a high spot in the terrain, because this reduces the angle of elevation and thus increases the range of the radar device.
28.
These trials included firing the gun at all angles of elevation and firing with the turret traversed 90 degrees to the vehicle s centerline, the results of both being satisfactory.
29.
There is a throw-out lever for rapid traverse of the collimator, which may be placed at an angle of elevation and locked in position by a series of meshing notches.
30.
Nevertheless, Pytheas did obtain latitudes, which, according to Strabo, he expressed in proportions of the gnMmMn ( " index " ), or trigonometric tangents of angles of elevation to celestial bodies.
