Page 515 - My FlipBook

Fig. 318. An enlarged view of a block of box-wood, the left side of which received thrusts from
the dynamometer and the right side strokes from the falling weights, according to the figures given
under Figure 316. The rounding up of the bruised wood in the bottoms of the punctures made by the
springing back of the wood i§ weU seen in the prints of the larger instruments. The picture does
not show depth very well,