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Suddenly out of the blur of the lens there sprang up in front of me, seemingly quite close, a zigzagging toy trench cut in the face of a little hillock. This trench was full of gray figures of the size of very small dolls. They were moving aimlessly back and forth, it seemed to me, doing nothing at all.
The receiver of this instrument was covered with a lens made of double convex glasses, the space between the glasses being filled with alchohol, which focussed the light coming through one of the compartments of the rose-window of the garret. The shelf of the receiver communicated with the wire of an immense galvanic battery.
Black discovered latent heat; and a prism, a lens, and a sheet of pasteboard enabled Newton to unfold the composition of light and the origin of colours. An eminent foreign savant once called upon Dr.
One year in Italy with their eyes open would be worth more than three at Oxford; and six months in the fields with a platyscopic lens would teach them strange things about the world around them that all the long terms at Harrow and Winchester have failed to discover to them. But that would involve some trouble to the teacher.
I counted the days, the hours, the minutes, that intervened between that promise and his departure. Meantime I was not idle. Every transparent substance that bore the remotest semblance to a lens I eagerly seized upon and employed in vain attempts to realize that instrument, the theory of whose construction I as yet only vaguely comprehended.
When a current is made to flow in a coil of wire the magnetic lines of force produced are concentrated, as at C, just as a lens concentrates rays of light, and this forms an intense magnetic field, as it is called.
Between this line and Lens lay the Vimy Ridge, and in front of its southwestern slopes the Germans had constructed elaborate fortifications above and underground known as the White Work and the Labyrinth. For the attack the French had made careful preparations, and their concentration of eleven hundred guns and almost limitless shells exceeded in intensity any previous experiment.
But this was fruitless, and we were driven again to the old point, and having once more obtained the emitted fluid, determined to fix a lens magnifying 5,000 diameters upon a clear space over which the fluid had rolled, and near to the exhausted sac, and ply our old trade of watching with unbroken observation. The result was a reward indeed.
The strip of film must be drawn before the lens by jerking movements so that the real motion of the strip would occur in the periods in which the shutter was closed, while it was at rest for the fraction of time in which the light of the projection apparatus passed through.
Besides these, there was a prism and a magnet; also a magnifying-glass, wherein a flea was transformed to a frightful monster, and a multiplying lens, which showed them the same object eleven times repeated. Ils l'appellent le Capitaine du iour. Quand elle sonne, ils disent qu'elle parle, et demandent quand ils nous viennent veoir, combien de fois le Capitaine a desia parle.
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