How Two Boys Made Their Own Electrical Apparatus Part 19

This is a text-book for amateurs, students, and others who want to take up a systematic course of electrical experiments at home or in school.

It will give a practical and experimental knowledge of elementary electricity, and thoroughly prepare students for advanced work. Full directions are given for

TWO HUNDRED EXPERIMENTS.

The experiments and discussions are so planned that the student is always prepared for what follows. Although the experiments may be performed with the apparatus that is usually found in school laboratories, the author has designed a complete set of apparatus for those who want to have their own outfit.

_If you want to take up a systematic course of experiments--experiments that will build a lasting foundation for your electrical knowledge--this book will serve as a valuable guide._

Jan. 1, 1918 STUDENT'S DISCOUNT DISCONTINUED

PRICE TO ALL, $6.25

Owing to greatly increased costs of labor and materials the discount of 65c formerly allowed on this set has been discontinued. Complete sets only now sold. s.h.i.+pping weight on improved sets 10 lbs. securely packed in wooden box. Sent by parcel post if proper postage is included in your remittance; otherwise by express charges collect.

Fun With Magnetism and Fun With Electricity have started more young men upon electrical careers than any other scientific outfits ever placed before the public. The thousands upon thousands that have been sold in all parts of the world have furnished fun and science for people of all ages, and the mere fact that they are listed by the New York Board of Education, and recommend to the pupils and teachers of the New York public and private schools is a guarantee of their value. Were it not for the fact that these are made in such large quant.i.ties and sold by stores, agents and mail-order houses, the price would be much higher.

Don't fail to get these. They have a national reputation.

FUN WITH MAGNETISM

This outfit contains a 32-page book of instructions, with 45 ill.u.s.trations, together with a complete set of apparatus for performing 61 fascinating experiments. It will give you some new ideas about magnetism and start you at the right place in your study of electricity.

Think what that means--to start right!

The book contains experiments with the horseshoe magnet, with bar magnets, with floating magnets, etc., etc., thus giving a practical knowledge of the subject; and it is all done in such an interesting way that one can't help remembering it. Every experiment clinches some fact and every fact is important.

Amusing Experiments.--Something for Nervous People to Try.--The Jersey Mosquito.--The Stampede.--The Runaway.--The Dog-fight.--The Whirligig.--The Naval Battle.--A String of Fish.--A Magnetic Gun.--A Top Upside down.--A Magnetic Windmill.--A Compa.s.s Upside down.--The Magnetic Acrobat.--The Busy Ant-hill.--The Magnetic Bridge.--The Merry-go-Round.--The Tight-rope Walker.--A Magnetic Motor Using Attractions and Repulsions.--And 43 Others.

No. R1--"Fun with Magnetism," Complete Outfit, postpaid $0.35

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FUN WITH ELECTRICITY

The author of this Fun with Science series has spent a great deal of time and money in experimenting to devise apparatus that will do the proper work and be, at the same time, simple and cheap, and in no outfit has he succeeded better than in Fun with Electricity. When you think of an outfit retailing for 50c. and covering the whole subject of "Static Electricity," giving 60 scientific experiments upon its production, conduction and induction, with a 55-page book of instructions with 38 drawings, and a complete set of apparatus of 20 articles for performing these 60 experiments, you will understand why the sales of this outfit have been enormous. As the subject is presented in a fascinating way--and not as mere dry science--every one likes to do the experiments.

No wonder these sets are highly praised by parents and educators in every part of the country!

There is Fun in these Experiments: Chain Lightning.--An Electric Whirligig.--The Baby Thunderstorm.--A Race with Electricity.--An Electric Frog Pond.--An Electric Ding-Dong.--The Magic Finger.--Daddy Long-Legs.--Jumping Sally.--An Electric Kite.--Very Shocking.--Condensed Lightning.--An Electric Fly-Trap.--The Merry Pendulum.--An Electric Ferry-Boat.--A Funny Piece of Paper.--A Joke on the Family Cat.--Electricity Plays Leap-Frog.--Lightning Goes Over a Bridge.--Electricity Carries a Lantern.--And 40 Others.

There isn't an outfit anywhere at any price that gives better value for the money. An ideal present for a boy.

No. R2--"Fun with Electricity," Complete Outfit, postpaid $0.65

FUN WITH PUZZLES

Here is an outfit that every boy and girl should have, for it is amusing, instructive and educational. It is real fun to do puzzles and to puzzle your friends, and this book contains some real brain-teasers that will make you think. The book contains 15 chapters, 80 pages, and 128 ill.u.s.trations, and measures 57-1/2 inches. If you can't do any particular puzzle you will find its solution in the "key," which is bound with the book. If you want to win prizes by doing the puzzles in the magazines, you will find this book of four hundred puzzles a regular school of puzzles that will give you a thorough training for this kind of work. The book alone is well worth the price, to say nothing of the outfit of numbers, counters, pictures, etc.

Contents of Book: Chapter (1) Secret Writing. (2) Magic Triangles, Squares, Rectangles, Hexagons, Crosses, Circles, etc. (3) Dropped Letter and Dropped Word Puzzles. (4) Mixed Proverbs, Prose and Rhyme. (5) Word Diamonds, Squares, Triangles, and Rhomboids. (6) Numerical Enigmas. (7) Jumbled Writing and Magic Proverbs. (8) Dissected Puzzles. (9) Hidden and Concealed Words. (10) Divided Cakes, Pies, Gardens, Farms, etc. (11) Bicycle and Boat Puzzles. (12) Various Word and Letter Puzzles. (13) Puzzles with Counters. (14) Combination Puzzles. (15) Mazes and Labyrinths.

Secret Writing is explained in this book, and it shows how you can write letters to your friends and be sure that no one can read them unless they are also in the secret. This one thing alone will give you a great deal of enjoyment. Get this outfit and have some fun.

No. R3--"Fun with Puzzles," Complete Outfit, postpaid $0.35

FUN WITH SOAP-BUBBLES

Fancy Bubbles and Films are not easily blown without special apparatus, and even with the proper outfit one must "know how." That's why we furnish a 16-page book with every set to show just how to do it. With the aid of the 21 ill.u.s.trations and the directions you can produce remarkable results that will surprise and entertain your friends. A child can do it as well as a grown person.

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Soap-Bubble Parties using these outfits create real sensations. Why not be the first in your town to give a "Fun with Soap-Bubbles Party?" Just write and ask about the price for any special number of them--say six or a dozen.

Contents of Book: Twenty-one Ill.u.s.trations.--Introduction.--The Colors of Soap-Bubbles.--The Outfit.--Soap Mixture.--Useful Hints.--Bubbles Blown with Pipes.--Bubbles Blown with Straws.--Bubbles Blown with the Horn.--Floating Bubbles.--Baby Bubbles.--Smoke Bubbles.--Bombsh.e.l.l Bubbles.--Dancing Bubbles.--Bubble Games.--Supported Bubbles.--Bubble Cl.u.s.ter.--Suspended Bubbles.--Bubble Lamp Chimney.--Bubble Lenses.--Bubble Basket.--Bubble Bellows.--To Draw a Bubble Through a Ring.--Bubble Acorn.--Bubble Bottle.--A Bubble Within a Bubble.--Another Way.--Bubble Shade.--Bubble Hammock.--Wrestling Bubbles.--A Smoking Bubble.--Soap Films.--The Tennis Racket Film.--Fish-net Film.--Pan-shaped Film.--Bow and Arrow Film.--Bubble Dome.--Double Bubble Dome.--Pyramid Bubbles.--Turtle-back Bubbles.--Soap-Bubbles and Frictional Electricity.

"There is nothing more beautiful than the airy-fairy soap-bubble with its everchanging colors." This outfit gives the best possible amus.e.m.e.nt for old and young.

No. R4--"Fun with Soap-Bubbles," Complete Outfit, postpaid $0.35

Three extra packages of prepared soap, postpaid .10

FUN WITH SHADOWS

No wonder shadow-making has been popular for several centuries! What could give keener delight than comical shadow-pictures, pantomimes, entertainments, etc.? Professional shadowists use wires, forms, and various devices to aid them, and that is why they get such wonderful results on the stage. Do you want to do the same thing right in your own home and entertain your friends with all kinds of fancy shadows? You can do it with this outfit, for the book contains 100 ill.u.s.trations and diagrams with directions for using the numerous articles included in the box. You will be surprised to see how easily you can make these funny shadows with the aid of the outfit. Better get one now and make shadows like a professional.

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The Outfit contains everything necessary for all ordinary shadow pictures, shadow entertainments, shadow plays, etc. The following articles are included: One book of Instructions called "Fun with Shadows"; 1 Shadow Screen; 2 Sheets of Tracing Paper; 1 Coil of Wire for Movable Figures; 1 Cardboard Frame for Circular Screen; 1 Cardboard House for Stage Scenery; 1 Jointed Wire Fish-pole and Line; 2 Bent Wire Scenery Holders; 4 Clamps for Screen; 1 Wire Figure Support; 1 Wire for Oar; 2 Spring Wire Table Clamps; 1 Wire Candlestick Holder; 5 Cardboard Plates containing the following printed figures that should be cut out with shears; 12 Character Hats; 1 Boat; 1 Oar-blade; 1 Fish; 1 Candlestick; 1 Cardboard Plate containing printed parts for making movable figures.

No. R5--"Fun with Shadows," Complete Outfit, postpaid $0.35

FUN WITH PHOTOGRAPHY

Popular Pastimes are numerous, but to many there is nothing more fascinating than photography. The magic of suns.h.i.+ne, the wonders of nature, and the beauties of art are tools in the hands of the amateur photographer. If you want to get a start in this up-to-date hobby, this outfit will help you. You will enjoy the work and be delighted with the beautiful pictures you can make.

The Outfit contains everything necessary for making prints--together with other articles to be used in various ways. The following things are included: One Ill.u.s.trated Book of Instructions, called "Fun With Photography"; 1 Package of Sensitized Paper; 1 Printing Frame, including Gla.s.s, Back, and Spring; 1 Set of Masks for Printing Frame; 1 Set of Patterns for Fancy Shapes; 1 Book of Negatives (Patented) Ready for Use; 6 Sheets of Blank Negative Paper; 1 Alphabet Sheet; 1 Package of Card Mounts; 1 Package of Folding Mounts; 1 Package of "Fixo."

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Contents of Book: Chapter I. Introduction.--Photography.--Magic Suns.h.i.+ne.--The Outfit.--II. General Instructions.--The Sensitized Paper.--How the Effects are Produced.--Negatives.--Prints.--Printing Frames.--Our Printing Frame.--Putting Negatives in Printing Frame.--Printing.--Developing.--Fixing.--Drying--- Tr.i.m.m.i.n.g.--Fancy Shapes.--Mounting.--III. Negatives and How to Make Them.--The Paper.--Making Transparent Paper.--Making the Negatives.--Printed Negatives.--Perforated Negatives.--Negatives Made from Magazine Pictures.--Ground Gla.s.s Negatives.--IV. Nature Photography.--Aids to Nature Study.--Ferns and Leaves.--Photographing Leaves.--Perforating Leaves.--Drying Leaves, Ferns, etc., for Negatives.--Flowers.--V.

Miscellaneous Photographs.--Magnetic Photographs.--Combination Pictures.--Initial Pictures.--Name Plates.--Christmas, Easter and Birthday Cards.

No. R6--"Fun with Photography," Complete Outfit, Postpaid $0.65