The practical astronomer : comprising illustrations of light and colours, practical descriptions of all kinds of telescopes, the use of the equatorial-transit, circular, and other astronomical instruments, a particular account of the Earl of Rosse's large telescopes, and other topics connected with astronomy (1845)
Dick, Thomas, 1774-1857 · London : Seeley, Burnside, and Seeley · leaf 125
ds by which this is effected: a is a largeconcave mirror, either of metal or of glass, placedon the back part of a dark box, d is the performer,concealed from the spectators by the cross parti-tion c ; e is a strong light, which is likewise con-cealed by the partition i, which is thrown upon… … reflected from thence to z, where the image of thebook will appear so distinct and tangible, that a ON THE REFLECTION OF LIGHT. 101 spectator locking through the opening at x, willimagine that it is in his power to take hold of it.In like manner, the person situated at d, may ex-hibit his own head…
Astronomy · Astronomical instruments · Telescopes
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