The San Francisco call. [volume] (San Francisco [Calif.]) 1895-1913, 1899-02-19

but just above the ground floor Of the
room, another iron shaft came through
the wall, also with a pulley on 1T. A
small well-worn belt was found, which
fitted over and exactly connected these
two pulleys. Going into the small rear
room, mostly filled with old junk and
the door Of which was raised consider
ably above that of the middle room,
there was discovered beneath box
and an oilcloth spread out on the floor
a trap door. This trap opened over the
shaft, which came through the wall.
Here 1t was found that the shaft con-
nected with a small water motor Of
peculiar construction, the water being
supplied by lead pipe coming in from
the outside of the building. Extend
ing from this water motor was small
rubber tube 1t was found that by at
taching a rubber bulb to this tube the
water motor could be started by press
ing the bulb and would stop when the
pressure was released. This water
motor is now in the laboratory OF Mr.
Kinraide, in Boston. The rubber tub
ing was found also to extend between
the walls and ceiling from the water
motor to a point under the Keely mo-
tor, then up through the stationary
post of the engine and to terminate in
the binding post or socket into which
the end of the wire was inserted which
connected the motor with the trans
mitter. Further investigation revealed
the fact that there were in the labora-
tory different sets of transmitting wire,
exactly alike in external appearance,
but one was hollow, the other solid
both, as mentioned, about the size of
knitting needle, and with connecting
tips that made 1t impossible to tell
which was hollow and which was solid
except by cutting or trying to blow
through them.
"A duplicate, an exact copy in exter-
nal appearance, was found Of the
latest perfected transmitter. the grad
ual perfection of years of patient study
and Improvement The duplicate
transmitter exactly resembled it's mate
but upon opening it the Chladni plates
and the resonatOrS were lacking. In
stead was a rubber diaphragm
stretched across the sphere, dividing II
vertically into two alright compart-
ments The long screw, with its head
in the little bulb on the side of the
sphere and which in the exhibition
transmitter regulated the position Of
the resonator, in the duplicate trans
mitter worked in fine thread through
a small brass plate clamped in the CEN
ter of the diaphragm. By turning the
knob the diaphragm could be thrown
backward or forward. By connecting
the motor and the real transmitter by
means of the hollow wire, then turning
the knob in the proper direction, the
diaphragm would be thrown forward,
the air forced through the wire and
down through its various connections
to the water motor, releasing an auto
matte cutoff and setting the water
motor in motion.
"a more careful investigation of the
Kelly motor showed that the station
airy axis was hollow. Within this hol-
low shaft, which was only a dummy,
the real axle revolved, over one end OF
which passed the belt which ran down
through the hollow post to the pulley
underneath on the end of the iron shaft
described This inner axle. run by the
belt, carried the hub of the motor and
caused the same to revolve when it re-
volved."