Tyndall, John, 1820-1893 · New York : Appleton · leaf 430
tone devised, many years ago, asmall and very efficient apparatus for the compounding ofrectangular vibrations. A drawing, Fig. 186, and a de-scription of this beautiful little instrument, for both ofwhich I am indebted to its eminent inventor, may find a 1 For some beautiful figures of this… … and-socket joint at b, so that it may assume any position.Its lower end is connected with two arms c and d, placedat right angles to each other, the other ends of whichare respectively attached to the circumferences of the twocircular disks e and f. The axis of the disk e carries atits opposite end…
Sound
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