Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 34
ld the mirror perpen-dicular to the beam. Is the beamreflected back to the slit? Nowturn the mirror to an angle of 45°to the beam. Is the reflected beamturned through an angle of 90°?That is, is the reflected beamturned through twice the anglethe mirror turns? Try other an-gles. The reflected beam… … Fig. 50. HeliograpMng FUN BY DAY WITH ONE MIRRORExperiment No. 25. The heliograph. Reflect sunlight fromyour window (Fig. 50) to a distant building, and have your friendreflect sunlight from near this building to your window. Now send a message to your friend by the Morse code. Un-cover your mirror…
Light · Scientific recreations
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