White Pine news. [volume] (East Ely, Nev.) 1920-1923, 1922-06-18
THE HOME RADIO
How IN Make and lJse Il 90 By A. HYATT vERRIlL
IL. PRINCIPLES OF WIRELESS TRANSMISSION
By A. A VERRlLl
cssuisAs b. Harper . Brssh~rs

Before attempting to explain the functions an the principles of the radio
to understand something of the underlying principles and fundamental laws
1t is not. however. necessary to enter into a long discussion IN the theories
merely g yto Illustrate and make clear a few important and n salient en- laws uDs.e e:u ses
n = wire, s.' ss,w wsen m %a. .sn5 n an an arsssaSos OF sU1 mn pos'0'e without tn use
The nrst and most important principle Of all radio transmission is the
lions pr, as We may call them for the sake 4 simplicity. waves. We ar accus-
stance which W e call air, but in reality thu air or atmosphere. space. and in
less bu exceedingly elastic u substance * known % 6 e sdca's or l N a%om " ssssr
1T II !. :, by t %san y, Of . . ether sn r, tina; all Ae; s,I light ss electricity ss., etc; are transmitted
to .. science lem. f fr a long time me-, o, i l., Is only within comparatively recent years
through the ether, and it val through this discovery. and BY ear of these
the electro magnetic waves are very similar to thu waves or rppes formed
, oy sl'p n ps. q s1Sne u q q s%% ear pSl Of q water he . 1S,s Jus, Il - r. the s, water waves
started by the spark of a wireless transmitting or sending instrument. spread
the pool are short and clear near the spot where the stone is thrown and grad
the splash, 50 wireless ave- aree clearer and sharper near the instrument and
draw sl :" another rsnere eeu aa ss , %s " ss , s' shore II p ~ a er s sMv oh sna to to
the water interrupts s or breaks . the waves so a wireless receiving ins.rum.n.
waves or vibrations set up by the wireless spark are electromagnetic wave.
started by muscular or mechanical energy. You al readily understand
if a person at a distance should toss stones into the water at stated intervals
a. 1srssn watching iemn's the shore re, and md noticing the intervals Ts'i Of the waves could
a very crude and uncertain method of communication; but II you could devise
creating waves Of definite sizes n nanoe,s a practical means II communea,
reception of electromagnetic o. wireless waves, for. by breaking or tnterruptns
tn, thew waves ,ts sen. ou. by tn e. spark ,s they icy are n.t transformed Into long and short SEE
These waves set in motion by the sending apparatus, possess the property Of
aerial or antennae of n wireless station they start oscillations in the wire.
ments vel provided to magnify aud catch them. Such instruments are known
and from which wires lead to a telephone receiver. The high frequency oscn.
latins of the ether. which re known IS alternating currents IS they flow
back and forth. are cut on by the magnets In the receiver, while the detector
Is designed to allow thu oscillation to pass through In n direction, but will
not allow them to return, and thus 1t acts as a cheekyaNe IN q water pipe and
the alternating backandfouh currents are transformed into impulses going
in one direction only and known us direct currents These will flow through a
telephone rfceyer and cause the diaphragm to vibrate. and thus the ear detects
the INTERRUPTED baz.ns sounds which indicate the dots and dashes of the code
Anothfr Ssl Important part o the mechanism Of the wireless apparatus is the
tuner, fof Without this the various vibrations OF the ether sent out from num-
bereSs Hau6ns would come 10 q hodge podge OF meaningless sounds to the
receiver. But by arranging the receiving instrument o 1t may be adjusted to
receive or pick up only those ave- Of a certain length, all other vibrations
and the messages they carry are eliminated or cut out. So. the wireless OBJ
sntor who Is receiving messages may adjust his instrument back and forth
nntlIh he picks up n message which may be passing through the ether att the