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These are styled self-setting needles, and are usually so arranged that they cannot be adjusted wrongly as to the position of the eye. In the Willcox & Gibbs machine, and in Singer's single thread machine, shown here, we have an intermittent tension arrangement, which clamps the thread at the right moment, and differs from ordinary tension devices, inasmuch as it may be said to be automatic.
I first thought of going on with my reading, but the zero weather would make a fire necessary, and it occurred to me that father might object to the cost of firewood that took time to chop. Therefore, I prudently decided to go down cellar, and begin work on a model of a self-setting sawmill I had invented.
This trap possesses the same advantages as the foregoing. It is self-setting, and unfailing in its action. Another method consists in half-filling the barrel with oats, and allowing the rats to enjoy their repast there for several days. When thus attracted to the spot, remove the oats, and pour the same bulk of water into the barrel, sprinkling the surface thickly with the grain.
After completing my self-setting sawmill I dammed one of the streams in the meadow and put the mill in operation.
The Box trap, page 103, is perhaps the most universal example of rabbit trap, but the Self-setting trap, page 110, and Double-ender, page 109, are also equally effective where the animal is desired to be taken alive. If this is not an object, the snare is to be recommended as simple in construction and sure in its result.
But they were entirely unlike other solid-fuel drives. The pasty white compound being hauled aloft was a self-setting refractory compound with which the rocket tubes would be lined, with the solid fuel filling the center. The tubes themselves were thin steel absurdly thin but wound with wire under tension to provide strength against bursting, like old-fashioned rifle cannon.
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