26 
THE YOUNG SCIENTIST. 
THE 
Young Scientist. 
A Practical Journal for Amateurs. 
With which has been incorporated 
"THE INDUSTRIAL MONTHLY," 
" THE TECHNOLOGIST," AND 
"HOME AETS." 
PUBLISHED MONTRLY AT 50cts. FEB YEAR. 
Postage free to all parts of the United States 
and Canada, except when delivered by letter 
carrier in New York City, in which case 12 cents 
per year postage is charged. 
For Club Eates and Premium List see Pros- 
pectus. 
Advertisements 30 cents per line, agate measure. 
All communications should be addressed to 
THE YOUNG SCIENTIST, 
14 Dey Street, New York. 
Eemittances.— Make all checks and postal 
orders payable to John Phin. U. S and English 
postage stamps received at full value for sums 
less than One Dollar. Canadian postage stamps 
are of no use to us, but Canadian silver and frac- 
tional currency will be received at full value. 
Bills. 
IITANY of our subscribers complain that 
we stop their journals without due 
notification, and that if they were re- 
minded of the expiration of their sub- 
scriptions they would at once remit. To 
remove all cause of dissatisfaction on this 
score we have printed little pink bills 
which were enclosed in the January num- 
ber to all whose subscriptions expired. If 
you wish to renew, just write your name 
and address distinctly in the blank space 
left for this purpose and enclose it to us 
Avith fifty cents, which may be in postag-e 
stamps. The receipted bill will be en- 
closed in the following number of the 
Young Scientist. 
Postage Stamps. 
WE again call the attention of our sub- 
scribers to the fact, that while we take 
postage stamps of small denominations 
at full value, those of higher denomina- 
tions are of no use whatever to us. We 
cannot sell them, except at a very great 
loss, and the post office will not exchange 
them for smaller denominations. There- 
fore, please do not send them. 
Scientific Blunders. 
A STRIKING illustration of the super- 
ficial character of the men who con- 
tribute " scientific " articles to the popular 
magazines occurs in a recent article on 
the telegraph in Harper's Magazine. The 
writer of this article illustrates his subject 
by water flowing through a pipe of three 
inches in diameter, which at a certain 
point forks into two branches, one being- 
two inches and the other one inch in 
diameter. He gravely informs his readers 
that it is clear that the stream will divide 
at the branches, one-third passing through 
the smaller pipe and two-thirds through 
the larger one. If the scientific writer 
had consulted a table of areas, he would 
have found that the two inch pipe has four 
times the area of the one inch pipe, and 
consequently, one-fifth the volume of 
water (instead of one-third) w^ill flow 
through the smaller pipe and four fifths 
through the two inch pipe. The writer in 
question seems to be about as ignorant of 
such matters as the owner of a certain 
stream who sold to a manufacturing com - 
pany a supply of water regulated by a 
pipe of a certain diameter. In process of 
time the company found that they needed 
more water so they made a bargain with 
the owner whereby they were allowed to 
use a pipe of double the diameter by pay- 
ing double the price. The owner of the 
stream did not know that a pipe of double 
the diameter w^ould allow four times the 
amount of water to pass throught it, and 
consequently his ignorance, of geometry 
resulted to him in an actual loss of dollars 
and cents. 
Who Wants a Rifle? 
WE have a very fine little Flobert rifle, 
the bore of which has been rifled so 
that it shoots with great accuracy. (The 
ordinary Flobert rifles are all smooth 
bores.) It is just the thing for small game 
or target practice, and we will give it to 
the first that sends us a club of fifty sub- 
scribers to the Young Scientist. Eemem- 
ber, this weapon will be given to the first 
that completes a club of fifty ; after that, 
those who wish a rifle as a premium, wall 
have to be satisfied with the ordinary 
weapon. 
