Laboratory exercises to accompany Carhart and Chute's First principles of physics . tions of the tuning fork in that period may be counted. Experimental: The best way of preparing the glass is to rub over it athin coat of Bon Ami or of whiting and alcohol, andallow it to dry. The apparatus should then be carefullyinspected and adjusted so that the tracing points of boththe fork and the pendulum will sweep across the plate inas nearly the same line as they can without interferingwith each other. The tracing points must bear on thesurface hard enough to scratch away the coating, but notwith pres
Laboratory exercises to accompany Carhart and Chute's First principles of physics . tions of the tuning fork in that period may be counted. Experimental: The best way of preparing the glass is to rub over it athin coat of Bon Ami or of whiting and alcohol, andallow it to dry. The apparatus should then be carefullyinspected and adjusted so that the tracing points of boththe fork and the pendulum will sweep across the plate inas nearly the same line as they can without interferingwith each other. The tracing points must bear on thesurface hard enough to scratch away the coating, but notwith pressure enough to check the motion of either forkor pendulum. This may be tested by setting each invibration with the glass at rest. The fork is best set vibrating by placing between the 118 LABORATORY EXERCISES prongs an oval stick of wood, thick enough to spread theprongs the desired amount, and then suddenly pulling itout. When all adjustments are made, set pendulum andtuning fork in vibration and with a steady, even motiondraw the glass along the track at such a rate as to have. Fig. 48. A Vibrograph. at least one complete swing of the pendulum, back andforth, recorded on the glass. Remove the glass, to permitothers to use the apparatus. The number of complete wave forms traced by the forkbetween two successive points where the pendulum wavecrosses the tuning fork wave, is the number of vibrationsmade by the tuning fork in the period of the pendulum. Place in tabular form, near the top of the left-hand page,the time of the pendulum period and the number of vibra-tions recorded each time during that period. ObservationsTrial \ 23 4 Observed vibrations . Period of pendulum . Number of fork . . VIBRATIONS OF A TUNING FORK 119 Make a simple drawing of your apparatus and describebriefly the essentials of the method. Calculate the average number of vibrations for theperiod of the pendulum, and from the average find -thenumber of vibrations per second. Record the calculatedresults at
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysics, bookyear1913
