[excerpt]

An organ N, mounted on the platform D and traveling around with the
same, is actuated automatically from the fixed cam, and for this purpose
the following arrangement is made: A driving-shaft N' is provided with a
pulley O, connected by a belt O' with a pulley OČ, secured on a shaft P,
journaled in suitable bearings arranged on the platform D. On the inner
end of the shaft P is secured a friction-wheel P' in engagement with an
annular track F', formed in the fixed cam F, so that when the platform D
is rotated, as before explained, it is evident that the friction-wheel
P' rolls off on the fixed track F', and consequently a rotary motion is
given to the shaft P, which by the pulleys O OČ and belt O' is
transmitted to the driving-shaft N' of the organ N.