The Challis messenger. (Challis, Idaho) 1912-current, 1925-05-06

~" iOoS SOii5 require large wire
good spacing between turns and, pref
erably, no supporting dIelectric. Il
one uses supporting tube or frame
work he must be sure 1t Is high quail.
ity. Keeping metal out Of the field
OF the coil Is important.
The method Of winding of itself ia
not essential to low-loss construction,
OUT certain methods of wiring help In
many ways to make possible the re-
Qulremepts set forth. A basket-weave
COIL, Tor instance, necessarily means
spacing between turns and rather
large wire.
The difference between the various
ways OF winding Is shown In the fig
ures. or course, every one knows
tnat coll wound on a tube, or so that
the completed coil itself forms a tube,
Is known as a solenoid winding. It is
probably the most common form of
winding we find.
Then there Is spiral winding In which
the diameter Of the coils progressively
increases One turn Is wound on ton
OF the other outward so the resulting
COIL Is one turn wide. It resembles
somewhat the fiat pancake type, the
form Tor which Is at the right Of Fig. 2.
Ihls type Is called the spider-web |
coll for obvious reasons. The inner d. |
ameter or diam ster Of the first turn. Is
usually about an inch and q half
There must be an odd number of slots
Usually the winding goes in one slot
and out the other, under and over
each spoke In turn. There Is no rea-
son why 1t should not 60 under two
ana over two just as In the Lorenz
winnings shown In the other figures
Inc usual Reinartz coil Is a spider
weo coil and can be very easily made
oy cutting to S-inch disk of d.
electric and slotting 1t after the man
aer shown. =
Characteristics Of Coils.
Basket-weave coils are of two tvnes
'dge wound, resembling the spiral and
'pider-web, or solenoid wound, resem- O
'ling the coll on tube. The same t
orns may be used for basket weave D
IS Tor Lorenz and are illustrated in a
'igs. I and 2. W
In Fig. l Is shown the most CON- c]
enient form you can have around tbo W
'orK table. 1t Is center disk with 13 OF
yilndrical spokes. The made-up form
lay be purchased complete. 1t NAV pt
mace from a sawed-of piece of dr.
lrtain rod and IL spokes. The smokes In
ust be removable, however. There Ia
ust be an odd number of them and CO
ley can be any material. as can the eli
inter. Thirteen liz just convenient its
cky number.
In winding the edgewise baskot me
cave the wire will go over one snoko sht
ID under the next, over and under dri
e spoke at time. The resultino dri
II VIII be a latticework effect sim. the
Z 10 the reed baskets so often seen par
iui ni'ure. the
IN winding the Lorenz coil. 90 over a "
0 spokes and under two. over and T.
uer TWO at time continually. R.- our
Use there Is an odd number. Won will die,
annually shift the starting point for fro,
n turn, as shown at the left NJ F,a boII
o co'h Hrst ana second turns | apa
IT by going over spoke A. one goos scre
and one goes under smoke n ono.
is because of the odd number of an
kes not Invisible by two. The re- tane
ing coll Is shown at the rIpbt ~ stra
l, with more Of trellis effect wav
Sides are smooth while neither from
OF the basket weave is smooth the
basket weave, however, is self. nror
ing, but the Lorenz coll must he driu
with string at the corners as in or h
o.oie puiilhg out the spokes Ing
Is the white cord one sees on
coils sold commercially.
Tho Winding. ~,
e spider-web coll requires tba n.,
ing form to remain in tho coil
Lorenz type requires tyinr nm cri ~
basket weave is self-supportIng ma do
seif-holding. The spider-web has t,n,n
what less inductance than either ont
e others for the same number If corn,
The others do not differ ma INV ,