Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 252
Fig. 120. … 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…
Physics
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