32
PRESTO
SPEED OF RADIO WAVES
Member of Engineering Committee of Radio Asso-
ciation Corrects Statement.
Conclusions arrived at by Capt. T. J. See, govern-
ment astronomer at Mare Island navy yard, Califor-
nia, that radio waves travel around the globe with
a velocity of 165,000 miles a second as compared with
186,000 miles a second for light waves, are not sup-
ported by facts, according to John V. L. Hogan, one
of the foremost authorities on radio in the country,
and a member of the engineering committee of the
American Radio association.
"The speed of light was determined accurately by
several scientific investigators many years ago," said
Mr. Hogan, "and the speed of longer electro-magnetic
waves, in which category the radio waves fall, has
been conceded by leading authorities to be the same.
In fact, light waves are understood generally to be
nothing more nor less than exceedingly high-fre-
quency electrical vibrations in space, and all electro-
magnetic waves, whether of high or low frequency,
have been shown by analysis and experiment to have
the same speed.
"Neither of the tests referred to by Capt. See can
be taken as accurate bases for determination of the
speed of radio waves. In the test conducted in March
this year, when a wireless signal was sent from a sta-
tion near New York to Warsaw, Poland, and reflected
back in 0.054 of a second of time, there were two re-
lays involved.
"One was used for transferring the radio signal to
a wire which connected the receiver and the sender
in Poland and the other connected the Polish trans-
mitter to this wire line. The time lag caused by these
two relays and the line connecting them easily could
increase the round-trip time for the radio impulse
from .046 to .054 of a second. That is, taking 186,000
miles per second as the speed of the radio wave, the
total time for the round trip should be only about
.046 of a second; so it is apparent that the difference
of .008 of a second might easily be due to the wire
and relay connections."
A FEW NOTES.
Daltry & DeArmand has opened a store in Sand
Springs, Okla., for music business.
Greenland's Music Store is the name of a new busi-
ness opened recently at 142 Main street, White Plains,
May 31, 1924.
N. Y. Paavo Greenland and Ben W. Wilson are the
proprietors.
The Hillsboro Music Shop, Hillsboro, O., Frank
H. Head, proprietor, was recently sold to J. E. Zim-
merman.
R. D. Haverly and L. C. Pitt, of Bedford, Ind.,
have opened a music store in that place and are doing
a good business.
Wilfred Hardy, for many years on Canada street,
Burlington, V t , has recently moved to the corner of
First street and Grand avenue.
The Bourke Music Co., 610 Fifth street, Denver,
dealer in musical instruments, has moved to larger
quarters at 424 Fourteenth street.
Bishop & Eoff are the owners of the Crescent City
Music Co., which was opened recently at Crescent
City, Fla.
The Dolf Music Co., Cleveland, O., has opened a
new branch store at St. Clair and East 125th streets.
The Piquette Piano Co. has moved from 68 Cannon
street to 183 Fairneld avenue, Bridgeport, Conn.
The Bradford Piano Co., Milwaukee, Wis., recently
leased quarters for a new branch store at Seventh
avenue and Mitchell street.
SLINGERLAND
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Over 40 Styles of Banjos, Banjo Mandolins, Tenor Banjos
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Write for Catalogue
SLINGERLAND BANJO CO.
1815 Orchard Street
CHICAGO
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