Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 310
lass, l ; lect. x. REFLECTION OF HEAT. 285 and on which is drawn a large arc, a b. Attached to themirror is a long straight lath, m n, while the mirror, rest-ing upon rollers, can be turned by the lath, which is toserve as an index. Those directly in front may see thatthe lath itself and its… … parts; that is to say, commencing at the end a with 0,tne arc is graduated up to 20. I now turn the lathindex, so that it shall be in the line of the beam emittedby the lamp. The beam falls upon the mirror, striking itas a perpendicular, and is reflected back from it alongthe line of incidence. I…
Heat
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