Wauchope, Joseph Alliene, 1873- · Chicago, Scott, Foresman and Company · leaf 88
ll of them on an average of 4 hours a day.If electricity costs 10 cents per kilowatt-hour what willbe the difference in cost per month (30 days) by usingtungsten lamps instead of carbon filament lamps? APPENDIX IEXPERIMENT A Question.— Does the use of dye in coloring threadblack affect its… … Directions.— Arrange the wedges of the instrumentas shown in the diagram with one supported on thetable and the other resting in the slot. Pass one endof the thread to be tested through the hole in the crank-shaft, and turn the crank so that the thread will winditself several times around the…
Physics
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