726 
FOREST AND STREAM 
December, 1918 
2*. BIGGEST BOOK BARGAIN EVER OFFERED 
TEN{ 
Smashing good outdoor books by 
that vigorous and fascinating 
writer, Stewart Edward White 
} FOR $5.00 
These books handsomely bound in light green siik cloth with gold stamp¬ 
ing would be cheap at $20.00 per set. There are only five hundred sets avail¬ 
able for distribution, and these will not last long as without any question this 
offer is the biggest book bargain ever available. The ten volumes consist of 
3734 pages; the set weighing twelve pounds — nothing better could be given 
for a holiday present than this splendid set of notable books. 
A SNAPSHOT OF EACH VOLUME 
“The Claim Jumpers” 
He had been pampered and petted since his 
birth. Sick at heart of the life he was leading, 
he went into the West, to manage a mining 
camp. 
One day he met her. She was the daughter 
of a low boozer and a woman of no account. 
But for her he forgot his work; for her he near¬ 
ly lost the mines to a gang of claim jumpers; 
for her he nearly dragged his manhood to 
depths of disgrace. 
“The Land of Footprints” 
Of all the books on Africa, this is the most 
delightful. It sweeps aside the staple African 
story which concerns itself only with rhinos, 
lions, and native guides, and discovers a new 
Africa, simply by finding the real one. Home- 
life which one does not associate with Africa, 
is told of interestingly. 
“The Blazed Trail” 
With nothing to his name but the clothes he 
wore, three dollars in his pocket and heart of 
oak, he plunged into the timberland of the 
lower Peninsula. The world had been bitter 
and he wanted to forget. 
The fight began. It was his big fight against 
nature, himself, and the other men. 
“The Silent Places” 
In a canoe he paddled away into the wilder¬ 
ness from the Hudson Bay post. He had his 
orders to bring back a renegade Indian to jus¬ 
tice. Painfully, slowly, on and on he pushed 
his way along the Trail, with its grim terrors 
of the North and giant vistas of snow country. 
“Camp and Trail” 
Here is a book for the wilderness traveler— 
for the camper and the tramper. It is a woods¬ 
man’s manual. It gives you all of the practical 
information you should have before starting 
for the woods, streams or lakes on your vaca¬ 
tion. White tells you from his lifelong experi¬ 
ence about common sense in the wilderness, 
what to wear and take with you, the camp out¬ 
fit, the cook outfit, what to eat and how to cook 
it. what to carry on a horse and how to pack 
it, how to select a canoe; and other things you 
must know when you go into the real woods. 
“Arizona Nights” 
A book of Western yarns and character por¬ 
trayals, that flash by the reader as though 
‘‘caught in the films.” Mr. White gives a view* 
of life on Arizona cattle-ranches which is in¬ 
stinct with vitality and love of that out-of-door 
existence which he knows so well. 
“The Rules of the Game” 
Bobby Orde was a vigorous football type of 
fellow who had made a sad failure of office 
routine. So he went into the California Si¬ 
erras with their great forests and wonderful 
natural resources, and there he found his niche 
in managing men. 
“The Riverman” 
This is a stirring and virile successor to “The 
Blazed-Trail.” Jack Orde was a river-boss and 
was making good. Life to him was a wonderful 
adventure. It was full of the big outdoors; of 
smashing timber; logs that boomed down the 
river; of sleeping and tramping in the cool, pine- 
scented air. 
“Blazed Trail Stories” 
Of the younger American writers, few de¬ 
serve so well the recognition extended to them 
as Stewart Edward White. There is a strong, 
clean virility about him that seems to go well 
with the atmosphere of his chosen scenes—the 
tonic breath of northern forests, the fragrance 
of balsam, the wide freedom of limitless avenues 
of trees, of unbroken expanses of snow. In 
some respects, Mr. White’s short stories are 
more enjoyable than even his longer books. To 
be sure one gets in them ratherless of nature 
and woodcraft; but on the other hand, one 
gets a greater number of vivid, rapid portraits 
of the sort of men who live their lives close to 
nature. 
“The Westerners” 
As a baby she traveled across the prairies to 
the foothills of the Rockies, where under the 
care of Jim Buckley her parents made camp in 
the 'sacred groves of the Indians. Blood was 
flowing. Settlers everywhere were in danger. 
Custer was attacked and wiped out. 
One day there came among the Indians a 
half breed who had a debt to settle with Jim 
Buckley—a debt of spite. It was soon over. 
Her father and mother were killed, and she 
kidnapped and taken far to the south. 
Don’t fail to take advantage of this truly remarkable offer. The books will 
be supplied while they last at $5 o* per set. If the supply is exhausted when 
your order is received money will be returned, otherwise the books will be 
shipped to you express charges collect. 
FOREST & STREAM, Book Dept. No. 9 E. 40th St., New York City 
THE TYRO’S PRIMER 
(continued from page 714) 
service bullet is 2,700 foot-seconds and the 
resulting velocity, also known as the re¬ 
maining velocity, at a point a thousand 
yards away is 1,068 foot-seconds. And for 
the bullet to travel the thousand yards or 
3,000 feet consumed 1.86 seconds, which is 
called the time of flight, making an aver¬ 
age velocity for that distance of a trifle 
over 1,600 foot-seconds. Most people are 
prone to jump to the conclusion that the 
muzzle velocity of a rifle indicates the num¬ 
ber of feet the bullet will travel in a sec¬ 
ond and I cite the above facts to expose 
this popular fallacy. 
There are two kinds of chronographs: 
The Boulenge-Breger which consists of a 
weight held up by an electro-magnet. A 
spring-impelled knife blade is held by an¬ 
other magnet in such a way that when re¬ 
leased, it springs out and makes a clean- 
cut mark upon the coating of soot that 
has been previously applied to the weight. 
First a mark is made in the soot on the 
weight at a point directly opposite the 
knife. A screen of wires connected with 
the magnet holding up the weight is placed 
at the muzzle of the gun, and when the 
.bullet, shell or charge of shot passes 
through this screen the circuit is broken 
and the weight starts to fall. At a prede¬ 
termined distance from the muzzle of the 
weapon, say 100 feet, there is a second 
screen of wires connected with the magnet 
that holds back the spring-impelled knife 
blade, and when the bullet breaks this cir¬ 
cuit, the knife flies out and marks the fall¬ 
ing weight. The distance between the first, 
or zero point, and the second mark is then 
carefully measured with a micrometer, and 
as heavy weights fall a short distance al¬ 
ways at the same speed, it is easy to trans¬ 
late the distance between the two points 
into time and so find out how long the bul¬ 
let took to cross the space between the 
two screens. This instrument is particu¬ 
larly useful for measuring the velocity of 
shot charges and shells fired from cannon. 
For measuring the velocity of rifle and 
pistol bullets, a much better and far sim¬ 
pler instrument is the Disk Chronograph 
developed and perfected by the late Dr. F. 
W. Mann, the greatest ballistician America 
ever produced. The device is nothing more 
than a revolving shaft that carries two 
disks of stiff paper placed five or ten feet 
apart. The bullet passes through the first 
revolving disk, crosses the space between 
the two disks, and strikes the second re¬ 
volving disk on a different radius than that 
on which th^ first was struck, on account 
of the second disk having revolved a dis¬ 
tance proportionate to the time consumed 
by the bullet in passing from the first to 
the second disk. Multiply the number of 
revolutions per second the disks are making 
by 360 and you have the speed in degrees. 
Then measure the number of degrees in¬ 
dicated by the bullet holes in the two disks 
and the time of flight is readily determined 
by a simple mathematical calculation. With 
this instrument the velocity of the bullet 
may be actually determined at any point 
during its flight, and the simplicity of the 
device reduces the element of error to a 
minimum. 
(to be continued next month) 
