The Ely miner. [volume] (Ely, Minn.) 1895-1986, 1923-05-18

and commutator shell together.
B.-Nipples of spokes holding COM
mutator shell central with reflector.
C.-Spokes passing through ref1ec-
tor and commutator shell.
D.-Earpiece of telephone receiver.
E-Piece of rubber bulb as sound
defector conveyor to reflector.
F.-Commutator shell.
G.-Wooden block fitted into COM
mutator shell, in which telephone Is
| fitted
H.-Adjusting screw to press re-
ceiver against rubber washer M.
J.-Holes for waves from telephone
receiver.
K.-Holding down clip for front Of
reflector.
brass standard screwed to base
and soldered TO reflector.
M-Rubber ring made from inner
tube Of motor tire.
The arrangement for using the old
aluminium cOmmutator shell for hold
ing the telephone receiver can also be
applied in a different manner. If the
wooden block is turned fiat it could
be screwed to the top of the radio
cabinet and large horn fitted on the
| small end of the commutator she'll as
amplifier. If number Of holes were
drilled in the side of the cone and the
holes tapped to take 3s-inch brass pipe,
! it could then be fitted with rubber
tubes, which could be fitted with ear
pieces of glass tubing and used by a
number o. persons.
Part of the brass knob taken from
a bed or door could be used instead
! of rubber.
Procure a telephone receiver, the d.
ameter of the cover of which is less
than that of the inside of commu-
tator shell which is two and thirteen
sixteenths inches. The depth from the
face of the earpiece to the back OF
the telephone does not matter much,
as a wooden case must now be made
to fit inside of the commutator shell;
| in this wooden case, part is turned out
to hold the rest of the receiver. A rub
Der ring is put inside the commutatOr
shell and the earpiece rests against 1t.
The wooden case is then put in place
and with the commutator. shell 1T is
held firmly by four screws. An ad-
justing screw at the end of the wood
en- case presses the earpiece tight
ly against the rubber ring and makes
an alright joint. The connections can
be brought out through the wooden
case of flexible cable, or otherwise, to
suit the maker. Diagrams of each
part are shown, as well as of the as
sembled instrument. When all parts
are ready, proceed TO assemble as fol-
lows: Take commutatOr shell reflector
and four spolles; pass a spoke from
the outside of the reflector into hole
in the commutator shell and screw on
the nipple; do the same with the other
spokes. The shell is then held in the
center of the reflector with the mar
row end pointing towards the polished
face of the reflector. Tighten up the
nipples evenly until the shell is rigid,
with no wabble or shake. The piece
of rubber horn bulb is cut so that
there is a space between 1t and the
face of the reflector when slipped over
the end of the commutator shell open,
ing. The brass strip is slipped on
, the outside and fastened to a neat
wooden base. The edge of the reflect
or rests on the wooden base and is
held down tight by a screw and clip
. When the reflector is fixed on the base
the brass strip can be soldered to the
back of the reflector. When the tele
phones are inserted, the block placed
in position, screwed tight and the back
adjusting screw frightened up, all is
then complete to connect up to the
set.
"a Science and Invention and Radio News.