CLEVER TRAINED DOG.

Balancing bicycle in stationary position long enough to have his picture taken.

A Dog Cyclist

THE TRAINING OF ANIMALS to perform various feats has reached a high degree of perfection, but very few animals have ever been taught to keep the bicycle upright. It is a fact that the dog pictured herewith will sit upon a wheel, and so adjust himself that while it is moving slowly he will not fall off. He is owned by J. B. Foster, of West Chester, Pennsylvania, who occupied his leisure time for nearly a year in teaching the dog. When the photograph was taken, the bicycle was not supported, but the dog held it in a stationary position long enough for the exposure to be made.

MR. HUGH A. HACKETT, a student in the Electrical Course of the American School, expects to get his degree from Johns Hopkins University next June. In his present studies he is leaning as much as possible to the scientific line, in order that he may take a B. S. degree from Armour Institute of Technology in as short a time as possible.

INVENTIONS-PATENTS

(Continued from Page 424)

an application as early as possible if the reduction to practice has not already been made in a manner susceptible of clear proof. If the application be filed, the actual construction of a specimen, which sometimes is very expensive, may generally be deferred.

If the application be not filed within two years of the first description of the invention in any printed publication, and within two years of the time when it was first in public use or on sale in the United States, no patent can lawfully be granted. Delicate questions sometimes arise as to whether an alleged use of the invention more than two years before was a "public use" within the meaning of the statute, or was merely an experimental use. It is not safe to take any chances in a matter of this sort, merely for the sake of having the term of the patent begin at a later date. When there are two applicants, each claiming a patent for the same invention, the patent is in some countries granted to the one who filed his application first. In the United States it is granted to him who first made the invention; and this, as explained above, means the one who first conceived and proceeded with diligence to reduce it to practice, either actually, or "constructively" by filing an application for patent. He who files the later application may therefore get the patent notwithstanding his tardiness; but in the absence of proof, it is presumed that he who filed first invented first; and he who files later has to sustain the burden of proof. This constitutes an additional reason for filing an application promptly.

Knocking

McGinnis owned a Billy goat,
He purchased in New York,
Which made its meals on shingle nails,
On leather, and on cork;

One day O'Grady came to town
From out the boundless West,
He pressed the little Billy goat,
The buttin' did the rest.

Modern Carpentry, by Fred. T. Hodgson, 256 pages, 230 illustrations, cloth binding. Price $1.00. Practical Uses of the Steel Square, by Fred. T. Hodgson, two volumes, 560 pages, 500 illustrations, cloth binding. Price $2.00.

Modern Estimator and Contractors' Guide, by Fred. T. Hodgson, 250 pages, fully illustrated, cloth binding. Price $1.50. Hodgson's New Hardwood Finishing, by Fred. T. Hodgson, 320 pages, fully illustrated, cloth binding. Price $1.00. Common Sense Stair Building and Handrailing, by Fred. T. Hodgson, 256 pages, 230 illustrations, cloth binding. Price $1.00.

Builders' Architectural Drawing, Self-Taught, by Fred. T. Hodgson, fully illustrated, 14 double plates, cloth binding. Price $2.00,

Swingle's Handbook for Steam Engineers and Electricians, by C. F. Swingle, M. E., 600 pages, hundreds of fine engravings, bound in full leather. Price $2.50.

Modern Wiring, Diagrams and Descriptions, by H. C. Horstman and V. H. Tousley, 160 pages, 200 illustrations, leather binding. Price $1.50.

Electricity Made Simple, by Clark C. Haskins, 220 pages, 160 illustrations, cloth binding. Price $1.00

Dynamo Tending for Engineers, by H. C. Horstman and V. H. Tousley, 250 pages, 100 illustrations, cloth binding. Price $1.50.

Easy Electrical Experiments, by L. P. Dickinson, 250 pages, 200 illustrations, cloth binding. Price $1.00. Practical Telephone Handbook, by T. S. Baldwin, 200 pages. fully illustrated. Price $1.00.

Telegraphy Self-Taught, by Theodore A. Edison, M. A., instructor at American School of Telegraphy, fully illustrated, cloth binding. Price $1.00.

Farm Engines and How to Run Them, by James H. Stephenson and other Experts, 220 pages, 75 illustrations. Price $1.00.

Modern Air Brake Practice, by Frank H. Dukesmith, 303 pages, fully illustrated. Price $1.50.

Modern Blacksmithing, Horseshoeing and Wagon Making, by J. G. Holmstom, 200 pages, fully illustrated. Price $1.00.

Book-Keeping Self-Taught, by P. C. Goodwin, cloth binding. Price $1.00.

Picture Making, by T. S. Baldwin, fully illustrated, cloth binding. Price $1.25.

Publishers of Self-Educational

Books for Home Study,