Shell2

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TRANSFORMER 2040 ; TRANSFORMER

wires. The ends of these wires are ultim- | [ : a
ately turned over the outside of the ee
windings and thus enclose them. The
whole is mounted on an ebonite base and
makes a neat and workmanlike job., If
good .grade material be used and the
insulation be perfect throughout, the result
will be quite satisfactory.

The first step is the preparation of the
bobbin, which can be made from an ebonite
tube about 1 in. diameter and 2} in. long.

SHELL TYPE TRANSFORMER

cs tr

Two ebonite di > attached
to the ends and should be some
2 in. diameter. The bobbin
is then mounted «ina lathe
and is ready for the winding,

as shown in -Fig. 34. The
bobbin is -best mounted on a
| mandrel and_ secured .with a
bw 3 : :
nee of ; me nut and washer to prevent it

FINISHING THE PUSH-PULL TRANSFORMER eee as ES,
i “eS _ slipping. The spool containing
Fig. 33- Here are given details of the four t .* i } rer +
strips, which are assembled on the tof t the wire has next ue
transformer by means of the brass s mounted in some e way

*
a
ae -_

FORMER CONSTRUCTION OF THE SHELL TYPE TRANSFORMER
Fig. 34. When it is ready to receive the winding the bobbin of the shell transf
in a lathe. The bobbin is made of ebonite, with disks of the sz

ner is mounted
at either end

ame material attac