Wright, Mark R., 1854- · London : Longmans · leaf 104
is shown by F. MoveE until its image can be seen; it must be moved through 20°. Turnthe mirror through 5°, 20°, &c., and repeat. The motion of the pinis always twice that of the mirror. If a mirror he made to rotate, the reflected beam moves throughtwice the angle passed over by the mirror.… … Fig. 68. The objectives of the lantern are removed and a black card witha circular hole in the centre is placed in the stage ; this is focussedwith the loose lens (fig. 68). Interpose a mirror and reflect the beamvertically into a glass jar covered with a glass plate. Notice howfeeble the…
Physics
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