There must be two sets of elevating gears, one which brings the axis of the gun and the sights together on to the target, thus finding the angle of sight and also pointing the axis of the gun at the target, and a second by which, independent of the sight which remains fixed, the elevation due to the range can be given to the gun and read by means of a pointer and dial marked in yards for range.
Katie scraped gears and smirked through her hand.
The rocking-bar is moved by a rack g into which a pinion on a cross-spindle j gears; the cross-spindle is moved by means of a worm-wheel into which a worm on the longitudinal FIG.
Spindle of the hand-wheel gears; one end of the cross-spindle moves the range drum 2'.
If a thousand like gears are to be cast, a thousand moulds must be made up, at least to an important extent by hand, for even machine moulding leaves something for careful manipulation by the moulder.
True to his word, when informed of our decision, he immediately put the gears in motion.
The general characteristics of the distribution effected by these gears are similar.
The lead is variable in the Stephenson link motion, whilst in the Walschaert and the Joy gears it is constant.
The crank shaft carries a pinion which gears into a toothed wheel of a coarse pitch, carrying cutters at the ends of the teeth.
Gears are provided for elevating, levelling, aligning the upper and lower optical systems, adjusting the inclination of the reflector and rotating the mast around a vertical axis so that observations may be made and azimuth angles taken in all directions.
These have a speed reduction from armature shaft to bridge column of 1500 to I, through four intermediate spur gears and a worm gear.