Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 525
r distance. Fig. 246 is a horizontal section of theinstrument. L and R represent the position of the eyes of the spectator;a, b, are two plane mirrors at 45 to his line of sight; A, B, are two largerplane mirrors, respectively nearly parallel to the former, c d aL Tva^fgb Rshow tne paths of rays… … objects as seen from the point l. The four mirrors are mounted in a box,and means are provided for adjusting the positions of the larger mirrors,as may be required. With this instrument the distant objects in a land-scape—a range of mountains, for example—which present to the naked eyelittle or no…
Inventions
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