The mirror. (Stillwater, Minn.) 1894-1925, 1916-08-10
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NOTICE TO INMATES

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mates must sign their register number and lock
all queries submitted for publication Inmates Names of
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being used. (Ed.)
O-1n recent issue of The Mirror you answered request
to give information in securing copyright etc. Will you kind
y grant me space in printing the last amendment copy
right aw?-A. ].
A-Whenever the author proprietor of book in for
eign language which shall be published in foreign country
before the day of publication in this country or his executors
administrators assigns shall deposit complete copy
the same, including all maps illustrations in the Ii
bray of Congress- Washington District Columbia within
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country and shall insert in such copy and all copies
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or the page immediaty following notice of the
copyright in the of the proprietor together true
date of m publication of such book, in the following
Published ninteen hundred and Privilege of
copyright in the United States reserved under approved
March third nineteen hundred and five, by and shall
within twelve months after the first publication of book
foreign country file the title of and deposit two
copies of in the original language his option
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In the limits OF the United States from plates made there
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citizens of the United States of America benefit of COPY
right substantially the same basis citizens.
Scientific American,
Q-Will you tell what the seven wonders of the
words-M T.
A-Accodiug World Encyclopedia the seven won
ders of ancient times
Pyramids of Egypt
Pharos of Egypt.
Hanging Gardens of Babylon.
Temple of Diana at Ephesus.
Statue of Jupiter by Phdias.
Mausoeum of Artemisia.
Colossus of Rhodes.
The wonders of the middle ages were:
Coliseum of Rome.
Caacombs of Alexandria,
Great Wall of China
Stonehenge.
Leaning Tower of Pisa
Porcelain Tower of Nankn.
Mosque of ST. Sophia in Constantinople.
The seven wonders of the world are
Wireless.
Telephone.
Aeroplane.
Radium.
Antiseptcs and Anttoxins
Spectrum Analysis.
XRays
OWL you kindly inform what is the principal diff
ference between acting and rejecting teescopesR W.
A-lhere kinds OF telescopes, retractng and
rejecting. In the former the rays of light made
verge focus lenses while in the latter they made
converge being reflected from the surface of slightly
caved highly polished mirror
The chief disadvantage of eacting telescopes the
spherical alterations of the lenses. In reflect
ing telescopes these alterations be done with by using
paaboc but the objection the latter the
many mechanical difficulties that have to be overcome.
Owing the travelling Of the earth in its orbit and revov
ing axis viewed by fixed telescope would
ed will always be in its field This is accomplished
by using equatorial mounting
In equatorial mounting there axes called
polar that parallel to the axis of the earh and the
other "declnation right angles Hence, when
star followed the telescope camped in position and
view.
The magnifyng of telescopes generally expressed
in dameter the practical limit of being 100 dameers
per diameter of telescope Thus the g. inch telescope
Lick Observatory may give magnifyng of 5000
diamees But such power only be used in very clear
made at ], 5000 diameers.
The largest refractng telescopes in the world in the
The Yekes Observatory, Geneva Lake.
Wis., has object lens 40 inches in diameter with focal
length "a feet The movable of the instrument turning
polar weighs about twelve and the clock II
Other large telescopes the 36nch Lick Observa
Mt. Hamilton, Ca where many important astronomical