Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 345
at A in the exact position of the reflecting layer of gas, 322 LECTURE VII. the beam will be divided, one portion being reflectedin the direction af, and the other portion transmittedthrough the glass towards f, exactly as the sound wave isdivided into a reflected and transmitted portion by… … rectangle formed like a gridiron, the cross bars of whichare brass tubes 0*4 of an inch in diameter, with a slitabout yLth of an inch in width running along the topof each. The gridiron is connected by tubes of india-rubber with the gas pipes of the building, so that on turn-ing a cock g the gas is…
Sound
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