A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 695
el. This rotates a pair of pointers P,which record the single revolutions andtens of revolutions of the disc D. Thedisc is provided with a number of holeswhich, in one position, come over a similarset of holes in the top of the wind chest.Thus every time the upper and lower holescome together,… … Fio. 615. B.rn LOUDNESS 671 The method of driving the disc should be noted. The holes areprilled obliquely through the plates, those in the disc being oppositelylooped to those in the top of the wind chest. As the air emergeslit is driven against one side of each hole in the disc and so causesfet…
Physics
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