If, for example, a knitting needle is stroked with the south pole of a magnet, the strokes being directed from the middle of the needle towards the two extremities alternately, the needle will acquire a north pole at each end and a south pole in the middle.
Accordingly, on the 10th of June, the weak and ailing tsarevich received twentyfive strokes with the knout (as then administered nobody ever survived thirty), and on the 24th fifteen more.
Damiani advocated the substitution of flagellation for the recitation of the penitential psalms, and drew up a scale according to which 1000 strokes were equivalent to ten psalms, and 15,000 to the whole psalter.
On the whole, however, the number of destructive lightning strokes and of days of thunder do not show a close parallelism.
The wing to act efficiently must be driven at a certain speed, and in such a manner that the down and up strokes shall glide into each other.
If the wing was inelastic, every part of it would reverse at precisely the same moment, and its vibration would be characterized by pauses or dead points at the end of the down and up strokes which would be fatal to it as a flying organ.
In., and N the number of effective strokes per minute, namely, one for each revolution of the crank shaft if the engine is single-acting, but twice as many if it is double-acting.
This tendency is common in adults as well as in children; the strokes of a clock may, for instance, be grouped into fours, and thus eleven is represented as two fours and three.
Those tiger yellow creatures of his seemed all steel and whalebone; like five trip-hammers they rose and fell with regular strokes of strength, which periodically started the boat along the water like a horizontal burst boiler out of a Mississippi steamer.
But the material was also subject to other defects, such as moisture lurking between the layers, which might be detected by strokes of the mallet; spots or stains; and spongy strips (taeniae), in which the ink would run and spoil the sheet.