These machines, which are driven by compressed air, are very handy in use, as the height and direction of the cut may be readily varied; but the work is rather severe to the driver on account of the recoil shock of the piston, and an assistant is necessary to clear out the small coal from the cut, which limits the rate of cutting.
The introduction of trunnionless guns recoiling axially through a fixed cradle enabled sights to be attached to the non-recoil parts of the mounting, so that the necessity of removing a delicate telescopic sight every round disappeared, and Q?'
The air, as explained, is a very light, thin, elastic medium, which yields on the slightest pressure, and unless the wings attacked it with great violence the necessary recoil or resistance could not be obtained.
Between pantheism and Unitarianism he seems to have balanced till his thirty-fifth year, always tending towards the former in virtue of the recoil from "anthropomorphism" which originally took him to Unitarianism.
But Ritschl's recoil carries him so far that he is left alone with merely "practical" experience.
Vehement recoil from Kant's deification of formal logic with its principle of " analytic " tautology.
La Rochefoucauld's character of the cardinal is on the whole harsh but scarcely unjust, and one of its sentences formulates, though in a manner which has a certain recoil upon the writer, the great defect of Retz's conduct: "Il a suscite les plus grands desordres dans l'etat sans avoir un dessein forme de s'en prevaloir."
The figure-of-8 and kite-like action of the wing referred to lead us to explain how it happens that the wing, which in many instances is a comparatively small and delicate organ, can yet attack the air with such vigour as to extract from it the recoil necessary to elevate and propel the flying creature.
The Slavonic peoples, whose territories then extended to the Elbe, and embraced the whole southern shore of the Baltic, were beginning to recoil before the vigorous impetus of the Germans in the West, who regarded their pagan neighbours in much the same way as the Spanish Conquistadores regarded the Aztecs and the Incas.
If water be struck with violence, the recoil obtained is great when compared with the recoil obtained from air similarly treated.
The French struggled gallantly to the close: but now a long succession of their leaders - Junot, Soult, Victor, Massena, Marmont, Joseph - had been in turn forced to recoil before 'Wellington; and while their troops fought henceforward under the depressing memory of many defeats, the Allies did so under the inspiriting influence of great successes, and with that absolute confidence in their chief which doubled their fighting power.
This enabled the gun to be layed from some little distance behind, so that the layer could be clear of recoil, and continuous laying was thus possible.
In this aversion to a purely or mainly intellectual training may be traced a recoil from the systematic metaphysics of Plato and Aristotle, whose tendency was to subordinate the practical man to the philosopher.
In the opening lines of the second and third books we can mark the recoil of a humane and sensitive spirit from the horrors of the reign of terror which he witnessed in his youth, and from the anarchy and confusion which prevailed at Rome during his later years.
The first volume of the Histoire et memoires de l'Academie (1733) contains many original papers by him upon a great variety of physical subjects, such as the motion of fluids, the nature of colour, the notes of the trumpet, the barometer, the fall of bodies, the recoil of guns, the freezing of water, &c.
It must launch itself in the ocean of air, and must extract from that air, by means of its travelling surfaces - however fashioned and however applied - the recoil or resistance necessary to elevate and carry it forward.