Description of a Chronograph, Adapted for Measuring the Varying Velocity of a Body in Motion Through the Air, Volume 13

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Bell and Daldy, 1866 - Chronograph - 32 pages

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Page 13 - H; I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z a, b, c, d, o, f, g, h, i...
Page 10 - E, the magnetism of the electro-magnet is destroyed, and the spring f carries back the keeper, which, by means of the arm a, gives a blow to the lever b. Thus the marker m is made to depart from the uniform spiral it was describing. When the current is restored the keeper is attracted, and thus the marker m is brought back, which continues to trace its spiral as if nothing had happened. E is connected with the clock, and its marker m
Page 13 - ... and so on. A galvanic stream will therefore take the following course, whether the springs be weighted or unweighted : copper a, brass b, copper c, brass d, copper e, brass /, copper g, &c. The current will only be interrupted when one or more threads have been cut and the corresponding spring is flying from the bottom to the top of its hole. About...
Page 9 - Fig. 31 gives a general view of the chronograph. A is a fly-wheel capable of revolving about a vertical axis, and carrying with it the cylinder K, which is covered with prepared paper for the reception of the clock and screen records. The length of the cylinder is 12 or 14 inches, and the diameter 4 inches. B is a...
Page 12 - Transverse grooves are cut at equal distances, something less than the diameter of the shot, as shown in the diagram. Staples of hard brass spring-wire (No. 14* or 15), are fixed with their prongs in the continuation of the grooves. Pieces of sheet copper A are provided, having two elliptical holes, the distance of whose centres equals the distance of the grooves. The pieces of copper A are used to connect each wire staple, as C, with its neighbour on each side. Thus, Fig.
Page 11 - The depression of the lever, h, raises the springs, *, which act as levers, and bring the diamond points, mm! , down upon the paper. When an experiment is to be made, care is taken to see that the two currents are complete. The fly-wheel, A, is set in motion by hand, so as to make about three revolutions in two seconds. The markers, m m...
Page 11 - E is connected with the screens, and records the passage of the shot through the screens. By comparing the marks made by m, m' the exact velocity of the shot can be calculated at all points of its course. The slide L is fixed parallel to F and the cylinder K by the brackets G, H.
Page 13 - ... which was sufficient to withstand a tolerably strong wind. As the weights were equal the threads were kept equally stretched. The arrangement of the screens for an experiment is shown in Fig.
Page 11 - This motion is communicated to m', which describes a very short arc of a circle about a point in AB. The arrangement is so made that when either of the markers m, m' is making a record, it has a motion which may be resolved partly in direction of the motion of the paper under it, and partly in a direction perpendicular to this. Thus records are obtained which can be read off by scale with great nicety. The pendulum of a half-seconds clock strikes once each double-beat a very light spring, and so...
Page 12 - Fig. 34, a, c, e, g, &c., represent these copper connexions put in their places and holding down the wire spring, which, when free, are in contact with the tops of the holes ; but, when properly weighted, they rest on the lower edge of the holes. Thus the copper c forms a connexion between the staples 6 and d ; the copper e joins d and /, and so on.

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