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Assuming that the length of the deflector is kept constant and in practice this is found to be convenient the ratios can be altered by altering the weights of one or both pendulums and by adjustment of the upper weight. For the upper harmonies, 1:4 down to 3:8, the two pendulums may be almost equally weighted, the top one somewhat more heavily than the other.
At other times again the motive force seemed to be so extraordinarily active that, the sound deflector notwithstanding, the instrument captured and transmitted a thousand noises which are not to be heard by the unobservant listener, or in some cases by any human ear. Weird enough these noises were at times.
At length it slowed down, hit against a metal deflector, and dropped sharply into one of the thirty-seven compartments of the roulette board. A croupier silently touched the square of 16 with his rake to indicate that this number had won, and the other croupier proceeded to gather in the stakes. Forty louis in notes were pushed over to Olive.
The three weeks of hard physical training had conditioned the boys perfectly. At the end of the twelfth round, both boys showed many signs of wear. Roger's cheeks were as red as the glow of a jet blast deflector from the hundreds of lefts Tom had pumped into his face, while Tom's ribs and mid-section were bruised and raw where Roger's punches had landed successfully.
According to the nature of the harmony, one only, or both together below the suspension, or one above and one below, are used. The weight of the lower pendulum, or deflector, is supported on a disc, resting on a pin passing through the bottom of a piece of brass tubing, which is provided with an eye at its upper end.
The action of the Twin Elliptic Pendulum is more complicated than that of the Rectilinear, as the harmony ratio is not between the swings of deflector and upper pendulum, but rather between the swings of the deflector and that of the system as a whole. Consequently "tuning" is a matter, not of timing, but of experiment.
The card on which the figure is to be traced, and the weights, are placed on a platform at the bottom of this pendulum. A second and shorter free pendulum, known as the "deflector," hung from the bottom of the first. This form of harmonograph gives figures of infinite variety and of extreme beauty and complexity.
These "pusher" fighters had an excellent field of view and fire forwards, but suffered from lack of speed and a large "blind" area to the rear. On the other hand, the single-seater tractors were potentially the superior fighters, and in order to protect the blades of the airscrew the French were the first to use deflector blades on them in tractor machines.
To prevent the incoming charge escaping through the exhaust ports of the cylinder a deflector is formed on the top of the piston, causing the fresh gas to travel in an upward direction, thus avoiding as far as possible escape of the mixture to the atmosphere.
Now to complete the work it was Stella, not by accident, but after careful study of its problem who gave the thought that led to the removal of the one remaining obstacle to its general and successful establishment. To test this new development of the famous sound deflector and perfect its details, scores of experiments were needed, most of which he and she carried out together.
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