d came opposite the hole in the screen and then made the signal, causing the divergence of the pith-balls at the instant that the same letter became visible to the observer at the other station through the aperture in his screen.
Betancourt, in 1796, constructed a single-line telegraph between Madrid and Aranjuez, a distance of twenty-seven miles, in which the electricity was furnished by a battery of Leyden jars, and the reading effected by the divergence of pith-balls.
It was not, howevenstances the apparatus is intended for the use of those unable to take walking exercise.
The bedridden patient uses the arms to flex and extend the legs and keep the body in motion, the bedstead rocking on its centers.
Lounde's English patent, 1796, described a gymnasticon with treadles for the feet and cranks for the arms.
It is adapted to exercise a limb which may have no voluntary motion, and may be used by a patient sitting, standing, or lying.
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