Sentence Examples with the word Base plate

The base plate rests upon levelling screws which permit the adjustment of the polar axis to be made with great precision.

The pattern is that of a true sight, that is to say, the base plate is capable of movement about two axes, one parallel to and the other at right angles to the axis of the gun, and has cross spirit-levels and a graduated elevating drum and independent deflection scale, so that compensation for level of wheels can be given and quadrant elevation.