MAMMOTH RANGE FINDER.

Press, Volume LVIII, Issue 17408, 20 March 1922, Page 2

MAMMOTH RANGE FINDER.

The latest sci«ntifio wonder i® a mammoth range finder, .which is capable of accurately judging the distance of any object up to 22 miles away; It. is three times the suse of any used' during the war, and it is the biggest of its kind in the world. the instrument is a metal tube, ■ l(Xi. feet long, mounted on a carnage which swings round on a circular track in much the same way as ft railway turtt.; tahie. . , In the centre of the tube is a control chamber containing intricate^ adjusting machinery, which is worked by the observers. By means of reflectors at the ends of the tube the obseiyer can see through an eyepiece the distant object, such as a battleship at sea. While the view process is complicated to describe, it may be pointed out thatthe instrument works on the wellknown principle that if the eyes look;, straight outwards towards & distant object, and are gradually turned wards, as the object approaches, if the, angle through which the_eyes turned could be measured it would be .possible ] to estimate the distance or object,;; In fact, this nfovement is made by a prism which may be moved along the tube by an operator,, and regorte the distance at the game timfe