. Machinery and processes of the industrial arts, and apparatus of the exact sciences. diapasons whose times are as three to four, representing the chord of afourth. The first of these appears when the initial difference of phaseis zero; the succeeding ones correspond to differences of phase equal tothe fractions ^-, yL, J., and i of the larger vibration; that is to say, theymake their appearance if, when the shorter vibration begins, the longeris advanced by the amounts of these several fractions. Fig. Lissajouss Comparator. The apparatus here described is adapted to exhibit the vibrati
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. diapasons whose times are as three to four, representing the chord of afourth. The first of these appears when the initial difference of phaseis zero; the succeeding ones correspond to differences of phase equal tothe fractions ^-, yL, J., and i of the larger vibration; that is to say, theymake their appearance if, when the shorter vibration begins, the longeris advanced by the amounts of these several fractions. Fig. Lissajouss Comparator. The apparatus here described is adapted to exhibit the vibration fig-ures to several observers at once. But as it may sometimes be desira- MECHANICAL EFFECTS OF VIBRATIONS. 509 ble to study the vibrations of bodies to which mirrors cannot be attached,as for instance, of stretched strings, Mr. Lissajous has contrived aningenious apparatus which he calls his comparator. This, which is rep-resented in the accompanying figure, consists of a diapason, to one limbof which is attached the object glass of a compound microscope; thebody of the microscope being detached and supported by an independ-ent stand. If the diapason be thrown into vibration, the image of anysmall object seen through the microscope will appear to have a similarmotion, which will be magnified by all the power of the the object be itself a point in a vibrating body, having its directionof vibration at right angles to that of the object-glass, and the combina-tion of the two motions wi
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Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectscientificappa
