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CHAPTER 33
FIG. 229.
and connected by cycle chains through a standard three-speed gear, modified by the
addition of a second sprocket to take the second chain. The iron frame supporting this
bicycle device, is built in such a way as to give complete clearance for the knees when
the machine is in operation. The frame is held in clamps, mounted on supports which are
rigidly fixed to the head and foot of a standard bed. The frame is fitted with two hubs
which carry brakes and can apply a load to either the hands or feet, singly or combined,
as required. The load is adjustable by a screw and can give a load up to 12 Ib. The pedals
of the driving cranks, used for the hands, have the webs removed, and a spindle form of
hand-grip is fitted instead. On the foot pedals, the webs have been retained and are used
for holding a metal boot to which the paralysed legs are strapped. The boot is made of
•fa
in. iron and the sole is bolted to the pedal and hinged at the heel to a curved gaiter,
which fits snugly around the calf of the leg; the whole is leather covered, and straps are
provided to secure the feet and legs. All parts which come in contact with the patient
are felt-padded. The foot and leg supports are adjustable, both as to the distance between
the feet and to support behind the calf—the latter to prevent adductor spasms. A speedo
meter and mile counter are incorporated in a position, which can be seen by the patient,
to observe the duration and speed of the movements. The revolution counter is fixed on
