. Laboratory exercises in elementary physics. 190 DYNAMICS. In EXPERIMENT 2. spiral spring; meter-stick; clamp; body whoset> r specific gravity is to be deter- mined ; vessel of water; stringor wire. Object.—To determine thespecific gravity of a solid — Notelength of spring, with sus-pended wire only attached,Fig. 98, C. Attach the bodyto the lower end, as in Fig. 98,A, and record the length ofspring. Bring the vessel ofwater under the body, immersethe body with the usual pre-cautions, and again record thelength of the spring B. Calculations.—Reading ofref
. Laboratory exercises in elementary physics. 190 DYNAMICS. In EXPERIMENT 2. spiral spring; meter-stick; clamp; body whoset> r specific gravity is to be deter- mined ; vessel of water; stringor wire. Object.—To determine thespecific gravity of a solid — Notelength of spring, with sus-pended wire only attached,Fig. 98, C. Attach the bodyto the lower end, as in Fig. 98,A, and record the length ofspring. Bring the vessel ofwater under the body, immersethe body with the usual pre-cautions, and again record thelength of the spring B. Calculations.—Reading ofreference-marks : Spring alone = With body attached = Body immersed = ac represents wt. in air. ab « water, and ac — ab represents loss of wt. in water, andSpecific gravity — ac _ acac — bc~ besame way find specific gravity of some Fig. ! 1. FOCI OF LENSES. Preliminary.—When the light from a luminous body-passes through a double convex lens, the point at whichall the light is concentrated is called the focus of the distance from the centre of the lens to the focus iscalled the focal length. The following exercise investigatesthe effect on the focal length of the distance of the objectfrom the lens. The apparatus shown in Fig. 99 is used.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics
