Amei^an Agriculturist, February 17, 1923 
151 
KiDed 200 Rats 
At One Baitiiig 
Dog, Ferret and Traps Failed—Amazing 
Virus Quickly Killed Them All. 
Not a Poison 
"I was over-run with rats,” writes H. O. 
Stenfert of Redford, Mich. “Seemed to be sev¬ 
eral hundred of them. Dog, Ferret and Traps 
failed. Was discouraged. Tried Imperial Virus 
and was rid of them all in a short time. Have 
found rat skeletons, large and small, all over 
the farm. 
“The year previous Rats killed 200 out of 
300 baby chicks. Last year saved them all. 
Will send for 10 bottles for neighbors, and we 
will clean up the whole neighborhood.” 
Rats, Mice. Go¬ 
phers, in fact all 
Rodents, greedily 
eat Imperial Vi¬ 
rus on bait. Sets 
up burning fever. 
Pests die outside 
hunting air and 
water. Harmless to humans, poultry, pets, 
stock, etc. Economical to use. Indorsed by 
Farm Bureau Experts and large, nationally 
known institutions everywhere. 
You Can Get Yours Free 
SKND NO MONEY. Write today to Imperial Labora¬ 
tories, Dept. 1002, Kansas City, Mo., and they will mail 
you two regular $1.00 bottles of Imperial Virus (double 
strength). Pay postman only $1.00 and few cents postage 
on arrival. Use one yourself and sell the other to a 
neighbor, thus getting yours free. Readers risk no money, 
as Imperial Laboratories are fully responsible and will 
refund your $1.00 on request any time within 30 days. 
The Martinique 
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The hotel is sit¬ 
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Tlicte is an cu¬ 
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Radio “Listening In” 
Operating The Simple Regenerative Set 
N ow that farms By BRAINi 
are being radio- 
equipped, a few words on operation of 
radio sets and what may be expected 
of them are not amiss. Assuming that 
a single tube regenerative outfit such 
as was described in the last radio in¬ 
stallment in the American Agricul¬ 
turist is in use, and the average single 
tube commercial product is of this type, 
there are one or two simple details of 
utmost importance. Where the WD-11 
tube is in use the adjustment of the 
rheostat will not be found critical, and 
it is best to turn the rheostat on only 
far enough to give satisfactory regen¬ 
eration. As the dry cell becomes used 
up it will be necessary to advance the 
rheostat more and more until finally, 
no regeneration can be obtained even 
with it all the way around. About 75 
hours of continuous service can be ex¬ 
pected from a single dry cell before it 
is necessary to purchase a new one. 
There are also several types of small 
storage or renewable batteries avail¬ 
able, and although their initial cost is 
about six or eight dollars, in the long 
run they are more satisfactory be¬ 
cause of their constant voltage. The 
Edison cell, for instance, gives 1,000 
hours service with one WD-11, and 
then a new internal element may be 
purchased for a dollar or two. If more 
than one WD-11 is used, as for amplifi¬ 
cation, as many dry cells as there are 
tubes should be connected in parallel 
for the “A” battery. 
How Batteries are Rated 
The standard “six volt” tubes operat¬ 
ing from a storage battery require 
about 1 ampere of current each. Bat¬ 
teries are always rated in “ampere- 
hours,” and it is easy to determine just 
how many hours a battery will last 
with such tubes by dividing its ampere- 
hour capacity by the number of amperes 
consumed. For instance, if the bat¬ 
tery is of the 80 ampere-hour size, 
and a 3 tube receiver is in use, there 
will be 3 amperes needed. Eighty di- 
divided by 3 gives about 25 hours con¬ 
tinuous service. It is dangerous to 
allow the battery to discharge lower 
than the minimum specific gravity 
reading marked on the label, and a 
syringe hydrometer should be purchased 
to gauge this. Where the farm is 
equipped with a 32-volt lighting sys¬ 
tem, it is possible to purchase an ad¬ 
ditional storage battery similar to the 
type used in the unit. This battery, 
when exhausted by the radio set, may 
be charged by substitution in the charg¬ 
ing system. Where the house is wired 
with 110-volt alternating current, there 
are a number of methods available 
for battery charging in a most econom¬ 
ical manner. The vibrating rectifier 
is a fairly reliable instrument, although 
the contacts need cleaning every month 
or two. The cost for charging the 
average battery by one of these recti¬ 
fiers is about a nickel. The Tungar 
rectifier uses special bulbs for the recti¬ 
fication, and while the operation is al¬ 
most noiseless and perfectly reliable, 
the tubes must be replaced once in a 
while. Hence it may be seen that the 
vibrating charger is more economical 
although it is noisy, while the bulb type 
costs considerably more for upkeep, 
but appeals to those who wish quiet 
operation. 
The “B” Battery 
“B” batteries usually last five or 
six months, and manifest old age in 
several ways. Often the zinc cylinders 
of the cells become eaten away, and the 
chemical action within will cause a ter¬ 
rific scraping and grinding sound in 
the receivers. Often they will begin 
to swell and bulge at the sides when 
used up. They, however, are not a 
serious item of expense in radio up¬ 
keep. Provided the vacuum tubes are 
never illuminated more brightly than 
necessary, they will last for a year or 
two, and recharging the battery will 
probably be the most expensive item. 
Of course with the WD-11, this ex¬ 
pense is very slight. 
If a regenerative set is used, and 
there are neighbors within half a mile 
using any form of radio set, it is a 
matter of radio etiquette to prevent 
JD FOOTE the set from regenerat¬ 
ing during the earlier 
evening hours as much as possible. 
Each regenerative receiver is also a 
low power transmitter, and radiates 
its feeble energy for a considerable dis¬ 
tance, often interfering seriously with 
clear reception at some other station. 
One sometimes hears little squeals and 
whistles chasing each other up and 
down while he is listening to a pro¬ 
gram, caused by some inconsiderate 
owner of a representative outfit. 
When tuning up and down the scale 
on such a set, the tuning dial and the 
dial controlling the regeneration should 
always be kept in such a relative posi¬ 
tion that regeneration is almost, but 
not quite beginning. At this point 
there will be marked amplificaion of 
music and speech without distortion, 
although if any adjustment is changed 
the least bit without at the sanie time 
altering the “tickler” or the “plate 
variometer” (which control regenera¬ 
tion) there will be soft hissing sound 
or squeal heard. Since owners of sets 
in country locations have so many 
broadcasting stations within their reach 
it might be well to keep a card handy 
to the set with the various dial ad¬ 
justments marked for best results on 
each station. These of course would be 
found by actual trial. 
In the Air 
It seems to be the fashion now for 
each broadcasting station to work along 
some particular line of endeavor, which 
will tend to identify and make that 
station prominent. And the various sta¬ 
tions have adopted slogans, bells, bits of 
song or other “earmarks” which appear 
somewhere in the program. Although 
there are over 500 broadcasting sta¬ 
tions east of the Mississippi, there are 
few really outstanding stations. About 
New York there are three excellent sta¬ 
tions : WEAF, obtaining an enviable 
reputation for the clearness of its 
broadcasting; WJZ the medium through 
which so many after-dinner speeches 
from meetings and banquets have been 
broadcast; WOR, whose afternoon se¬ 
lections are admired for their origi¬ 
nality and variety. Boston is well rep¬ 
resented by WNAC the Shepard Stores 
and WGI of Medford Hillside. In that 
vicinity, too, the Westinghouse company 
operates WBZ of Springfield, Mass., 
this station, together with the other 
Westinghouse stations in Newark, 
KDKA of Pittsburgh, and KYW of 
Chicago, are all careful to give complete 
information of value to the farmer. 
The Central states are well repre¬ 
sented by KYW, KSD, the St. Louis 
“Post Dispatch,” WLAG of Minneapo¬ 
lis, “The Call of the North” WOC of 
Davenport, “Out Where the West Be¬ 
gins,” WDAF of Kansas City, and 
WHAS of the Louisville “Courier- 
Journal.” 
Southern stations seem to cluster in 
Atlanta for some unaccountable reason, 
and with one or two of the Fort Worth, 
Texas, stations and three of Phila¬ 
delphia, the radio fan may travel at 
will over the eastern part of our coun¬ 
try and yet warm his toes before his 
own fireside. Radio entertainers can¬ 
not see their audiences, and thus depend 
solely upon letters, telegrams and phone 
calls for applause or criticism. For 
that reason, broadcast stations are 
anxious to hear from their listeners, 
for suggestions and comments are al¬ 
ways welcome. To attract such com¬ 
munications, several of the broadcast¬ 
ing stations have organized “fraterni¬ 
ties” among their listeners, and WDAP 
of the Drake Hotel, Chicago, awards 
prizes, raffles off Ford cars in front of 
the announcer’s microphone, and in 
every way simulates the personal touch 
found in the theater. Inasmuch as the 
stations are operated at a great ex¬ 
pense without possibility of revenue, 
and the performers are not paid for 
their services, it really becomes the duty 
of a satisfied listener to write his ap¬ 
plause to the station, or if certain fea¬ 
tures are objectionable to him, to send 
in his well-meant criticism. 
For the information of those who have con¬ 
structed the single tube outfit described in 
the American Agriculturist of February 3, the 
next radio article will explain the construc¬ 
tion of a two-stage amplifier to be used in 
conjunction with any one bulb receiver. 
Make Yoar Own 
Radio Sets 
Variometer 
$2.50 
Varicoupler - - - 
- 2 50 
Socket V. T. 
.25 
Rheostat . . . 
.25 
Paper Condenser 
.15 
Variable Condenser— 
23-Plate - 
1.65 
43-Plate - 
- 2.00 
Acme Transformer 
3.75 
2000-ohm — 
Murdock Phone - 
3.50 
Baldwin Phone 
- 10.00 
FREE CATALOG 
Write to Dept. B 
DAVID KILLOCH COMPANY 
57 MURRAY STREET 
NEW YORK 
■pY paying the top market prices for 
furs.we have earned the friendship 
of Ihonsaiicls of trappersand shippers. 
No shipment is too .small—no shipment 
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Valuable market information and 
little hints which mean money to 
you are included IT |C CppE* 
m our price list. * * iO r l\£i£i 
Send for yours today 
A post card will do 
lAS.EnELMAN&(]O.INC 
• Dept 55, 333 7th Avenue, New York, N. Y. 
STROUT’S 
New Farm 
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THE COW 
BY 
JARED VAN WAGENEN, Jr. 
Price of Illustrated Edition, ^1.50 
For sale at all bookstores or from 
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64-66 Fifth Avenue, New York 
