train-arm

In some cases, particularly when annular wheels are used, the train-arm may become very short, so that it may be impossible to mount the planet-wheel in the manner thus far represented, upon a pin carried by a crank.

Scientific American Supplement, No. 470, January 3, 1885 Various

Then, as the train-arm revolves, the three cranks must remain parallel to each other; but C D being fixed, the cranks, H F and B G, will remain always parallel to their original positions, thus receiving the required motion of circular translation.

Scientific American Supplement, No. 470, January 3, 1885 Various

It makes no difference what the actual value of the ratio A/_a_ may be, but it must be equal to F/_f_: under which condition it is evident that if A and F be driven contrary ways at equal speeds, small or great, the train-arm will remain at rest; but any inequality will cause the index to turn.

Scientific American Supplement, No. 470, January 3, 1885 Various

In Fig. 33, an index, P, is carried by the wheel, F: the wheel, A, is loose upon the shaft of the train-arm, which latter is driven by the wheel, E.

Scientific American Supplement, No. 470, January 3, 1885 Various

In these the velocity ratios are constant, if we except the cases in which two independent trains converge, the two sun-wheels, or one of them and the train-arm, being driven separately -- and even in those, a variable motion of the ultimate follower is obtained only by varying the speed of one or both drivers.

Scientific American Supplement, No. 470, January 3, 1885 Various

N, the point D a circle, and S an ellipse; C D being the train-arm.

Scientific American Supplement, No. 470, January 3, 1885 Various

The planetary body is carried round by a train-arm, and its rotation about its axis is usually given it by a train of gearing, the inner or central wheel of which is stationary, being fastened to the fixed frame supporting the whole.

Scientific American Supplement, No. 447, July 26, 1884 Various

Now as the train-arm, T, is carried round, the cranks, B and C, will turn in their bearings; but by their connection with A, they are compelled to remain always parallel to themselves, and thus the axis of the moon receives a motion of translation.

Scientific American Supplement, No. 447, July 26, 1884 Various

The mechanism consists of a train-arm, T, which turns upon the vertical pivot, P, fixed in the stand.

Scientific American Supplement, No. 447, July 26, 1884 Various

The same object may also be accomplished as shown in Fig. 34, the index being carried by the train-arm.

Scientific American Supplement, No. 470, January 3, 1885 Various