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HERE are XIX chapters of subjects, carrying you from the fundamental principles of electricity on through the

various branches to a point where the careful student comprehends the complete designing, care and operation

of a dynamo or motor. Each subject is carefully written and to the point. After a student studies a subject. he is questioned on that subject in such a manner as to bring clearly to his mind the points he needs to know regarding same. A DICTIONARY in back of book will enable him to learn the meaning of any electrical word, term or phrase used in this book, as well as hundreds of others in common use. All required tables necessary in the study are in it


$2.00 per Copy-Third Edition 11,000 Copies Sold The offer we make of refunding money if book is

- not satisfactory upon examination is AN UNUSUAL ONE in connection with the sale of a book. But we have no fear of its return. Your decision will be what thousands of others have been. Money would not buy it if it could not be duplicated. We could print testimonials by the hundreds. It is best to order and be your own judge of its merits.

CLEVELAND ARMATURE WORKS, Cleveland, Ohio. AMERICA'S GREATEST REPAIR WORKS. Armatures and Fields Wound-Commutators Filled.

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T This is what one customer has to say

U about the Dies we send out with our I - Pipe Cutting and Threading Machines :

Il We bought our machines

over twenty-five years
ago, and are using some

of the original dies today. Il
(Let us tell you about the lasting qualities
and small repair bills. Our machines are
the Standard. Made in all sizes, for cutting

and threading 14" to 18" pipe. - Bignall & Keller Mfg. Co.

Leclaire, Edwardsville, Illinois

LIFE STORIES-HENRY PHIPPS-(Concluded) negie fortune. But the wisdom of the canny Scotchman came to his assistance. Phipps and Thomas Carnegie knew how to run an iron mill. They had had successful experience. To them went Andrew Carnegie with a proposition. They three would form a company. He would put in his mill, and hold forty per cent of the stock. Phipps and Thomas Carnegie would put in such capital as they possessed and their experience, and hold the remaining stock. The deal was made; also the vast fortune of Andrew Carnegie-potentially, at least.

Phipps ran the finances of the new concern; Thomas Carnegie, the mill proper. And the mill began to pay well. Then Phipps, never satisfied till he knew all about a subject in which he was interested, fussed around the furnaces until he discovered a new process of making pig iron which cut the necessary expense down by a large percentage. That process was kept secret for a long while, and it fairly poured big profits into the coffers of Carnegie, Phipps & Company.

There is'nt any use in going further with this story. If the lesson isn't plain by this time, it never will be.

When the billion dollar "Steel Trust" was formed, Henry Phipps had—next to Andrew Carnegie—the largest interest in it. He had, it is certain, more money than any human being can possibly know what to do with. To-day the little, short, slender, "pony-built" errand-boy of the late fifties, lives in a Scotch castle and in a Fifth Avenue palace, retired from active business. In personal manners he is gentle and retiring. He has given great conservatories to the town where he made his wealth, and in other ways has shown the philanthropic spirit.

There seems to be no good reason why any young man may not follow his example—up to the full limit of his abilities and his opportunities.

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This device applied to Radiator Valves obviates the annoyance caused
by leaky stuffing boxes in soiling carpets, walls and ceilings, and the
constant attention necessary in keeping them tight. Equivalent
results are obtained when applied to Globe and Gate Valves.

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are the standard for accuracy, workmanship, design and

finish. Whether you use tools to earn your daily bread or for amusement and relaxation from a different vocation, it pays to use GOOD tools. You can get a better quality of bread and a good deal more pleasure. Use Starrett Tools.

Send for Catalogue No. 176. 176 pages, illustrated, free
THE L. S. STARRETT CO. Athol, Mass, U. S. A.

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Displacement of Ships

Question: I am taking advantage of your offer, to ask for information through your magazine. I wish some one would kindly give some information as to displacement of boats, and what base it is figured on.-J. P.

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Answer: The displacement of a vessel is the weight of the volume of water which it displaces. For sea water, it is equal to the volume of the vessel beneath the water line in cubic feet, divided by 35, the result being the displacement in tons of 2,240 pounds.

The displacement or gross tonnage is sometimes approximately estimated as follows:

If L denotes the length, in feet, of the boat; B, its breadth in feet; and D, the mean draft in feet, the product of these three dimensions will give the volume of a parallelopipedon, in cubic feet. Putting V for this volume, we have:



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If It's Electric We Have It. We Undersell All.

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Xmas Tree Lamps and Battery .....$ 3.00 Battery Table Lamp .....

3.00 Battery Hanging Lamp............. 10.00 Telephone, complete........

50, 5.95 Electric Door Bells..

1.00 Electric Carriage Lamps .. Electric Lanterns.............

3.00 $8.00 Medical Batteries....... $12.00 Belt, with Suspensory .. 2.50 Telegraph Outfits....

2.00 Battery Motors ......

12.00 Battery Fan Motor ..., Bicycle Electric Lights.

3.50 Electric Railway .,...

3.25 Pocket Flash Lights ....... 1.00 to 2 50 Necktie Lights....... 900, 1.00 and 1.25

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The volume of displacement may then be expressed as a percentage of the volume V, known as the “block coeïficient." This percentage varies for different classes of ships. In racing yachts with deep keels, it may be as low as 22; in modern merchant vessels, it varies from 55 to 75. For ordinary small boats, 50 will give a fair estimate. The volume V, obtained as above, when multiplied by the correct "block coefficient,” will give the actual volume of displacement in cubic feet. Dividing the volume of displacement by 35, as mentioned above, gives the displacement in tons.

In ship construction, more accurate methods are employed than the above. From the plans of the ship, different water lines are determined ; and by means of these curves, together with the crosssections at regular intervals along the ship's length, the displacement can be accurately determined.

Punchings, Castings, Materials

and Blue Prints

for the Franklin Dynamo

Price, $3.50 and up

Output 10 volts, 5 amperes. Write for Circular 7.

PARSELL 2 WEED 129-131 W. 31st St.


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Xmas Tree Outfit


THIS outfit consists of a number of feet of flexible cord with

a regular attaching plug at one end, and branch festoons,

each having eight miniature pendant sockets wired thereon. With the outfit is supplied the neccessary number of Miniature Decorative Lamps, plain and in colors. g To arrange the lighting decoration it is necessary only to screw the attaching plug into the nearest regular lamp socket, drape the wires over the tree, screw the little lamps into the sockets, and the decoration is complete. g The outfit is simple, flexible, thoroughly constructed and perfectly safe. g The first cost is low, considering that the Miniature Lamps are included, and an outfit once purchased will last for years and can be used repeatedly with little trouble and no additional

The outfits will be supplied for eight lamps and multiples of eight; that is 8, 16, 24, etc., lamps. Orders should specify voltage of circuit and type of regular lamp socket used.

The following is a list of the sizes supplied :
Eight Light Outfit ,

. . . . . .
Sixteen Light Outfit

$5.00 . .

• 8.50 Twenty-four Light Outfit .

12.00 Thirty-two Light Outfit :

15.00 Extra festoons (ready for connection) consisting of eight

sockets with extra lamps for increasing size of outfit 4.00 The Twenty-four Light Outfit is the standard size.

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