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Updated: May 6, 2025
A very neat application of this principle is found in Villa's Pantograph, of which a full description and illustration was given in SCIENTIFIC AMERICAN SUPPLEMENT, No. 424; the racks, moving side by side, are the sun-wheels, and the planet-wheels are the pinions, carried by the traveling socket, by which the motion of one rack is transmitted to the other.
Thus far attention has been called only to combinations of circular wheels. 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.
In this museum may be seen one or two examples of bronze Gaulish sun-wheels with four and eight spokes; and, what is to me very touching, a number of children's toys made in clay, found in children's tombs cocks and hens, pigs and horses, very rude. Similar toys are to be found in the Arles and the Avignon museums.
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