. Laboratory exercises in elementary physics. with a slot in its upper end about £ inch wider than the beam,and deep enough to permit the beam to move freely in a vertical * By Ritchie. 240 APPENDIX C. plane. The projecting ends on each side of the slot are cut in theform of a flat V, with the angle slightly rounded. Pieces ofsheet-brass are fitted to these notches and fastened in place. Inthe beam is iuserted transversely a knife-edge, K, made of a pieceof sheet-brass, whose lower edge has been filed sharp where it willbear on the sheet-support. Care must be used in weighing that. the beam do
. Laboratory exercises in elementary physics. with a slot in its upper end about £ inch wider than the beam,and deep enough to permit the beam to move freely in a vertical * By Ritchie. 240 APPENDIX C. plane. The projecting ends on each side of the slot are cut in theform of a flat V, with the angle slightly rounded. Pieces ofsheet-brass are fitted to these notches and fastened in place. Inthe beam is iuserted transversely a knife-edge, K, made of a pieceof sheet-brass, whose lower edge has been filed sharp where it willbear on the sheet-support. Care must be used in weighing that. the beam does not rub against the sides of the slot. Increaseddelicacy could be attained by projecting beyond the support oneend of the knife-edge and attaching to it a long pointer readingon a scale upon the lower part of the post. In using these scalesit would probably be best to weigh by substitution, except whenratios only are required.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics
