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THE HOME RADIO
How to Make and U m It
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Original Estimate and Accounting Sheet
XVII. LOOSE-COUPLED COILS
<’• «.
as they ar« more often
«•lie
tuning culls, are very eweeallal
pa '•
f radio telegraphy ami tele
piumy. The old style tuning coll, as
used n wireless telegraphy, has been
la .eli «-qe-rseded by the type know«
as
-oci-upled coils or adjustable-
colls
hlrii may be altered or adjusted
%
to tut •• much finer <>r more rloeely than
by the old type coil.
Although It la
not difficult tn make a looee-coupled
coll it as Is the case with many of
th» | cta of radio seta. It la as cheap
and f -r move satisfactory to purvbaae
them ready made.
The cuoventlunal
type
f loose coupled coll rotuUata of
two -I .tlnct culls, one within the other,
ns sb- wn In Fig 4A
one of thews
Is th-
primary coll, the other the
eecoti-’ary or induction coll. The two
are
> arranged that the Inner or
•■ - t ary coll slips liack and forth
within the larger or primary cull,
thus varying the coupling or Indue-
tb-i-
for the electricity—or ooriiia-
t
■
in the accondary
coil Is merely Induced
tjy th«- primary circuit
In the outer coil, so
that If a ¡Mirllou of the
MN-ondury coll la with
draw i from the primcry
COU, ns shown In ths
figure, there will be lews
inducisi current and In
this way tuning la ac-
->..i|- - s I mh I.
T o allow
of «still
finer adjust
ment the primary . <dl
la provided with ati ad
justable slider A. and
the - "ti-lary coil baa
a multi-pointed switch
B.
Am-ltier type ofiooM
ci'Uph -I coll la arranged
ao th-it one ct»fl re
volve» within the other|
while
another
type,
whb h la the simplest of
all for the amateur to
con-truct and gives the
beat results,
la con»-
posed of three discs or
ci-lln -»tagger wound" which nwty
adjusted back and forth.
To make
one of them- Inductors you will re
quire some stiff, smooth cardboard,
henv) Bristol hoard, thtn fibrebonrd
ur alm Inr composition and about half
a pound --f No. 24 1» C. O. wire. Also.
In setting up and arranging the colla,
you will require binding poets, knobs,
a little ahwt brass and a few other
odd* and ends
With a pair of di
vider» or <->-mpa‘»es draw three ctrcles
oti the cardboard or Vlbre. each about
four to five Inches In diameter, having
Th'-n. ue-
all evaetly the same rise.
Ing the dlvtdera, «cribe off an unequal
number (Ave. erven, nr nine) marks
around the circumference of each
Fig 47, A.
Next, »till uelng
circle
the dividers, draw a »mailer rtrele.
»ay -me and one half Inch«« to two and
one half Inches In diameter within
each
Irde (B).
If the circles are
four Inches In diameter use the smaller
circle Inalde. If five Inches the larger
one ml with a rule draw radiating
line» one-fosirth of an inch apart fnmi
meh
f the marks on the outer cir
cumference to the center of the circle
(D.
With a pair of aciaours or a
sharp knife (if cardboard la used)
or a fine »aw (If fibre), cut out the
diacs and cut slots In each diac accord
ing to the marks, as shown at (D).
Next. If you have used cardt.oarx!
give each slotted diac a thorough
c«ivering with shellac, using at least
three
its and when thoroughly dry
pr>> -ed to wind the dises or colls
In doing thia start the wire-being
. in- to leave enough for cotitveetlons
at a i -.lrst at the Inner end of one
riot iud wind over one eegment and
under the next, and as the numbet
Is it; - vn you will find that the wires
will thus ertasx, as shown at (■). The
number Of times the Wire should be
pnv.ed «-an only be decided upon by
Subscribe now
School District No. 95
experiment Ing after «he coll la In
use. but. as a starter, about twenty
five or thirty turn* -n one. about -ns
and one-half time« a. many, or say
thirty right to fmtj A«« >>n the «maid,
and twice as many on the third as wn
the Arst. or from fifty to sixty, will be
somewhere near rt. ■ t
Then, by re
moving or adding a few turns, as you
adjust your receiver» you can Quail)
secure the very twat result*
T”
mount this cull ao It may be UM'd.
the coil or dis. with the least turne
er. tn other wonts, the primary rtdl
should be tm-untril rigidly and Im
movably ami should he connect rd by
means of binding poets to the arrlai
and ground wire«
The wi-miery
coll and the tickler coll should then
be fastened to brass nr metal strips
about two or two and one half Im lies
long, one-sixteenth ln- h thick and half
an Inch wide
tin«- end of eu< h strip
should be attached by small bolts or
screws to the cells and the other etui
This original estimate is made in compliance with section ¡31-A of the school laws of
1921 and sh--ws in l'arsile! columns the unit costs of the several services, material and sup
plies for the throe fiscal year« next preceding the currant year, the dotati expenditure« for
the last one ut «ani three preceding fiscal year«
tures for «ix months of the current year.
and the budget
allowance« and expendi
("Six months of the current year" means six
months of the last school year.)
EXPENDITURES
«
Expenditures and
budget allowance
for six months of
last school year
M
5?1
Second
year give
yearly
lutala
itudg't
alluw-
anee in
detail
Expendi-
ures in
detail
First
ysargive
yaarly
tutela
•i
Paasoxu. soavi«a
2. t*rinei|iahi
& Teacht-rs...
1 2OX)
1215
1155
limo
990
9»l >
!«nn
4ÍV
60
4 Janitor............................
5 Clerk ..............................
7. Other services
Total- f*er»ona) Servici »4 9010
Msttaist «st> xcrrtiaa
1. Furniture (desk, etc »
2 Supple« (chalk, etc.).
8. I.itirary books
...
4. Laboratory sutqilies
fi. Janitor's suppliMi ...
7. Fuel ... .................
.....................
H. Light
». M atcr ..............
10. Postage are!stationery rl
Total
Valerial A suppliet 1
275
S5
HO
50
25
150
2S
12
20
00 f KU) Ost » HXV IV
HlO DO
HlO 00
OU
<V
7«U Wi
ìtìy 9M
7») tv
tv
720 (V
OOl
«O «XI
fifio 00
«fin <x>
tifili IV
DO
00
720 to
72u «V
00
:nxt 00
300 UP
IV
25 00
25 00
V • V . v|
53 311
oo 1 &7|x 2H| -’«-I >JK
(VI.
00>
(V
00
DO
(V
00
00
on
706 004
1X33 'M
«374 »7
4.'s)
50
»
8717
..... 771.
25 <M*r
63 »0
&*> 50
43 <v
266
11
aa
40
100 (V
24 (V
Total
... •
»
indebtedness
lfit< 60
350 00 4
25» 64 4
2fiti «i
360 (V 4
25» 54 4
266 tifi
«16
35
50
%
6 I»
Ml %*
i 5o
1 on
1» 72 4
M iivTiNwcs *st> Ksrvias
lewi fit!
H4 H7 4
Heating plant ..................... » «75 00 4
5ti0 00‘. . • ««•ss I •
ss..
Buildings ami gruuntia.
r i¿S¿ Ó04
Total
Maintenance A Kep.
■ “fifi fifi
Is nsirTKOMkas
Interest on warrants
DO
00
25
4H Í HK75 DO» tUKU 12
4
5(> K
H3
634 % 4
362 H6
4
7&H HI
324 »7 I
1H6 I«
H
H3 II«
324 97
-324 97»
104 9fl
lasoaxs« «
Total—Insurance
attached to a movable ¡«-g >r holt with
a fibre or bakelite kn-.b at the ->pp<-rir«
end.
Fig 4* shows clearly how this
Is done.
In this way th« secondary
and tickler may be swung back and
forth to cover m-*re or less of the
primary; hut great care should be
UWl that the tk’klef d-1 Mot loll- h the
primary coll.
When the coll la thus
«nountoil on a proper panel or stand.
It should be wired as shown In Fig
41» and when the whole set Is In g-s»d
working order and Anal adjustments
made. It should all be enclo*.«l in a
newt wooden case »tth a hinged top or
cover. Fig 50, although, of course,
this la merely a protr- live measure and
does not aITii t the working efh- iency
of the act
|t li><iat I- ■ learly under
stood, however, that t'-is type of coll
can only tie used In - oi.im tli-n with
a vacuum tulo- outfit a« shown When
all wiring la complete and adjustments
are ready to m- mn-h
i .«t the
storage ballet y. a- aiiown; place the
lamp or tube In Its -locket and gradual
ly turn on I lie rheostat to W” if the
tube glows pwperly
Never turn on
the current to the bulb quickly or to
full power ■>r lh>* filament will lev
nredlrs.ly burnt out end wasted lung
before Its time
Xe«t
e--one-1 the
H. (or dry) battery the gr> und and
airrial and, fi- .ill) the pt -i
tn using this outfit, turn on the
bulb slowly, adjust the knobs carrying
the mils so liuti all three are in line
and then adjust or tune the variable
condenser until the » -naia you wish
to hear are clear. Tl-v.i. by gradually
adjusting the movable rolls, y<ai can
cut out Interference and als« ■ ike the
signals, mush or other sounds loader.
When the two movable toll« s-e entire
ly away from the primary-rtdl you will
have your shortest war« lenii h, while
when all three are together roti will
have the longest wave length
$1.75 the Y ear
i
60 tv
4
46 50
... i
50 uo
»
45 50
Mts« ■ i t tSSuVS
Printing smi advertising
Nuppliv« for l>. Science
Freight and hauling ...
Total
75 t»j
75 OoS
75 «>
n
»
Mi»crllan«M>u» «
6 tv 4
100 tv
20 IJOj..
13
•7 52
126 DOf
HO VI 4
4 N5
llV 24
1H ;w
123 47|
...........
H7 00
r.MXX'-XVl V
Total
Emergency
s
517 42.
2
617 42
iisiin lorn......................
.
JUi
• ••••«• L
421 (K79 3X I 7uC4i MS W-Ó 1M|1Q!32 75f KPfc 5a
I, Annie 1». Ilartu. do hereby certify that th« above estimate of expenditures for the
year 1922-1 -2.1 was prepared by me and that the expenditures and budget allowance for ria
months of the current year and the expenditures for the three fiscal year» next preceding
the current year as shown above have been compiled from the records in my charge and
are true and correct copies thereof.
ANNIE I). HARTIJ, l’istrici Clerk.
A Lake en Shipboard
When one contémplales tbai mi um-
energy gs ex ertevi to the end of keel-
ng the water out of a ship u I ioi . i
up as an aatoiushing fact timt Ilici
la of nexeeaily a grow« -leal of Wale
iltbln lise bull of the ve«»<-|
A lutai
•ni liner hu» enough water in her liu
to make a good »ixed lake
Aleni
L74U ton» of water la curried by ■ l>
iKiasrnger veaael
The drinking wale,
fo» the use uf pss-v-nger» amounts ■
<s>. and there are sl»>ul fClO tons •>
sea water being used tor ballasi
11.,
»lx bollerà contalo MU t ri»
TI-
lank« are ri tu a Un) between the doubl*
bulla of the veaael.
— . ............. o . .
We Do Dyeing
Hub Cleaning Works, Inc
Muter Dyers anti Cleasers
—
335 Lyon st., Albany, Ore
Raisin Lacle.
Heat the yolks -nd
bite« --f two
eggs separately and n-l<l thr ill to three
cupfula of sugar, mixed with two
quarts of skimmed milk and 1*4 cup
fuls of plum|H-d ami
‘
- d rulaina
When partly fn-sen add the Juice of ■
lemon.
•«rang. Thing.
One of the strangest things in thia
wivrtd is why a woman will tell the
neighbors her daughter ran -Ing when
theli ears are perfectly otn|<ma
las News
RADIO RALF AND HIS FRIENDS
.-ç
Exiwnditurve for three fis
cal years next preceding
the last school year
We Do Pleating
S M A M M—
By JACK WILSON
;♦ «'
‘.V. ’?
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W-rt
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