AMERICAN HOMES AND GARDENS September, rg11 
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RAILWAY EXCHANGE BUILDING--CHICAGO 
D, H. BURNHAM & CO., Architects M. J. CORBOY. Plumbing Contractor 
All Plumbing Goods for this Building were Manufactured by the 
L. Wolff Manufacturing Co. 
Manufacturers of | 
Plumbing Goods Exclusively 
The Only Complete Line Made By Any One Firm 
General Offices: 601 to 627 West Lake Street, Chicago 
DENVER Showrooms 111 N, Dearborn Street, Chicago TRENTON 
National Photo- 
Engraving 
Company 
q Designers and 
Engravers for all 
Artistic, Scientific 
and Illustrative 
Recording Thermometers Sheena: 2 oe 
BRISTOL’S 
For recording outdoor atmospheric tempera- 
tures. 
Recording Instrument installed indoors. 
Sensitive bulb in weather protecting lattice 
bex located outdoors. 
Write for Bulletin No. 124 giving full in- 14-16-18 Reade St, New York 
formation, 
THE BRISTOL COMPANY 
Waterbury, Conn. T ELE) Pat OMNGEs 
Engravers of "American Homes and Gardens" 
knowledge. The frontispiece, entitled 
“General Principles of the Aeroplane,” rep- 
resents a flat-planed affair with two revolva- 
ble planes at the front serving, evidently, 
as a rudder; between them is seated the 
‘“aeronaut.” A steering plane is at the ex- 
treme front, and a queer-looking propeller 
at the rear, just in back of the two rear 
surfaces that are labeled “usually immov- 
able.” What ‘general principle” this is 
supposed to represent is certainly an 
enigma. In the discussion of theoretical 
matter no explanations of the action of 
cambered surfaces or of the movement of 
the center of pressure are given. A typical 
example of the absurdity of the entire book 
is the following: “The system introduced 
by Mr. Chanute of a longitudinal girder 
crossed by two transverse frames support- 
ing the planes is rather fragile when the 
weight is limited as at present, and Lang- 
ley’s frame is but little stronger. In fact, 
the late professor’s man-carrying machine 
came to grief (owing to collapse of guide- 
rails) before flight.” Confusing statements 
of this sort are worse than worthless. An- 
other choice specimen is this: “If a plane 
touches any obstacle during the flight, there 
is almost certain destruction of the whole 
machine. For this reason it seems desirable 
to reduce the speed.” No doubt we shall 
soon have “narrow-gage’ aeroplanes de- 
signed to fly through tight places! A re- 
freshingly amusing paragraph is the fol- 
lowing: “The plane has to carry, in addi- 
tion to its own weight, that of the prime 
mover and the propeller, together with 
other small items, such as aeronauts.” 
The continual use of the word “aero- 
naut” instead of the more usual “aviator” 
is to be condemned. 
Tue Bic GAME oF Arrica. By Richard 
Tjadler. New York: D. Appleton & 
Company, 1910. - 8vo.; 364 pp. “Brice 
$3 net. 
Good books on hunting trips and ad- 
ventures in the “Dark Continent” are 
plentiful. The author’s apology for offer- 
ing to the public “The Big Game of Africa” 
is a desire to comply with the wishes of his 
many friends who have heard his lectures 
on Africa, and have repeatedly asked him 
to issue them in book form. The volume 
is not only a narrative of his own wander- 
ings and experiences in that continent, but 
is also intended to be a guide-book for 
those who are thinking of hunting in 
Africa, and also for those who are expect- 
ing to stalk game with camera or gun. The 
book is made up of the experiences of three 
expeditions in British East Africa, and con- 
tains the most reliable information that it is 
possible to obtain from others who have 
hunted in that wonderful game country, and 
from the natives, who themselves spend 
most of their time wandering among the 
big game of Africa. The book is beauti- 
fully bound and is an addition to any 
library. 
Tue Younc Etectrician. By Hammond 
Hall. New York: The Macmillan Com- 
pany, 1910. 8vo.; 289 pp.; illustrated. 
Price, $1.50 net. 
The author’s aim is to afford “instructive 
_amusement to intelligent boys.” Starting 
with the early discoveries and the first prin- 
ciples of electrical science, he leads the 
reader on through the simple experiments 
of attraction and repulsion, of the elec- 
troscope and the Leyden jar, to such pro- 
cesses as electrotyping and electroplating, 
and to such devices as the telegraph, the 
dynamo, and the necessary equipment for 
wireless telegraphy. 
