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The Boy Mechanic: Volume 1 700 Things for Boys to Do online

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correspond to those given in Fig. 10. Drill a 1/8-in. hole, A, in
this piece, and cut a slot, B, from one side of the piece into
this hole, and a second slot, C, along the center of the piece as
indicated in the figure. Considerable care should be exercised in
cutting the slot C, so that its breadth is exactly equal to the
diameter of the piece of steel wire fastened on the end of the
couple. Also make sure to get the sides of this slot perfectly
smooth. Cut from some 1/8-in. brass a disk having a diameter of
1/2 in., and solder it to the end of the needle. The dotted line
in Fig. 10 indicates the proper position of the disk. Now drill a
hole, D, through the disk and needle, of such a diameter that
considerable force must be applied to the steel shaft you have
already made, in order to force it through the hole. Force the

[Illustration: Shaft for Needle and Needle]

through this hole until the needle is exactly in the center of the

The parts of the thermostat thus far made can now be assembled.
Place the steel shaft in its bearings and see that it turns
perfectly free. Then place the steel pin, on the end of the
couple, in the slot C, and fasten the

[Illustration: Wiring Diagram for One and Two Bells]

other end of the couple, by means of two machine screws, to the
support made for the couple. Increase or decrease the temperature
of the thermostat and note the results. If everything is working
all right, the end of the needle should move when the temperature
of the thermostat is changed. The amount the end of the needle
moves can be easily changed by moving the support or the couple
toward or away from the shaft supporting the needle, which changes
the position of the steel pin in the slot C. The nearer the steel
pin is to the shaft supporting the needle, the greater the
movement of the end of the needle due to a given change in

A small piece of white cardboard can be mounted directly under the
end of the needle by means of small brass strips, that in turn can
be attached to the lower ends of the main mounting holes D, Fig.
4. A scale can be marked on this piece of cardboard by noting the
position of the needle corresponding to different temperatures as
determined by a thermometer. When this scale has been completed,
you can use the thermostat as a thermometer.

Two contacts may be mounted, one on each side of the needle, in a
manner similar to the method suggested for mounting the cardboard.
These contacts should be so constructed that the end of the needle
will slide over them with little friction, and so that their
position with respect to the end of the needle may be easily

[Illustration: Assembled Thermostat]

Both contacts must be insulated from the remainder of the
thermostat, and may or may not be connected together, depending on
how the thermostat is to be used.

It would be advisable, if possible, to have the part of the needle
that touches the contact points, as well as these points, of
platinum, as the arc that is likely to be formed will not destroy
the platinum as easily as it will the brass. A small wooden
containing case can now be made and the thermostat is complete.
There should be a large number of holes drilled in the sides, ends
and back of the case so that the air inside may be always of the
same temperature as the outside air.

In adjusting, testing, or calibrating your thermostat, make sure
that it is in the same position that it will be in when in use.

The connections of the thermostat for ringing one bell when the
temperature rises or falls to a certain value, are shown in Fig.
11. The connections of the thermostat for ringing one bell when
the temperature rises to a certain value and another bell when the
temperature falls to a certain value, are shown in Fig. 12. The
complete thermostat is shown in Fig. 13.

** A Tailless Kite [458]

The frame of a 3-ft. kite is made of two sticks, each 3 ft. long.
These are tied together so that the cross stick will be at a
distance of 15 per cent of the full length of the upright stick,
from its end, or in this case 5.4 in. The sticks may be made of
straight grained pine, 3/8 in. square, for small kites, and larger
hardwood sticks, for larger kites.

The cross stick is bent into a bow

[Illustration: Plan and Dimensions for Kite]

by tying a strong cord across from end to end. The center of the
bend should be 4-1/2 in. above the ends. The bend is shown in the
sketch. Connect all four ends or points with a cord, being careful
not to pull the bend of the cross stick down, but seeing that it
remains straight across the kite. When this is done the frame is
ready for the cover.

The cover will require 2-1/2 sheets of tissue paper, 20 by 30 in.,
which should be pasted together as the sketch indicates. Cut out
the paper, allowing 2 in. margin for lapping over the cord on the
frame. Place the frame on the cover with the convex side toward
the paper and paste the margin over the cord, allowing the paper
to bag a little to form pockets for the air to lift the kite. The
corners should be reinforced with circular pieces of paper pasted
over the ends of the sticks.

The flying cord is attached to the points A and B of the frame.
There is no cross cord. The kite will fly at right angles to the
flying cord. It is easily started flying from the ground by laying
it with the head toward the operator and pulling it up into the
- Contributed by Chas. B. Damik, Cooperstown, N. Y.

** The Levitation - A Modern Stage Trick [459]

This illusion has mystified thousands of the theater-going public,
in fact, it has been the "piece de resistance" of many illusion
acts. The ordinary method of procedure is as follows: The person
who is to be suspended in the air, apparently with no
support - usually a lady - is first put in a hypnotic (?) sleep. She
is placed on a couch in the middle of the stage, and in most cases
the spotlight is brought into play. The performer then takes a
position close to the couch and with dramatic

[Illustration: Raising the Subject in Midair]

effect makes a few hypnotic passes over the subject. She then
slowly rises from the couch until she has attained a height
varying from 4 to 5 ft. above the stage, as shown in Fig. 1. The
couch is then taken a way and a hoop is passed over the floating
lady. The performer now causes the lady to float back to the couch
or board that she may have been resting on, after which the
so-called hypnotic spell is withdrawn.

In spite of the claims that the illusion owes its origin to Hindoo
magic, it is nothing more nor less than a clever mechanical
contrivance, the construction of which will be readily understood
by a glance at the accompanying illustrations.

The bottom of the couch, if one is used, contains a cradle-like
arrangement which fits the recumbent form of the lady and is
connected to a heavy sheet of plate glass by means of a rod, D,
Fig. 2, attached to one end, and running parallel to the side of
the cradle. When the glass is lifted, the body of the subject is
also raised, seemingly at the will of the performer. This is
accomplished by the aid of an assistant beneath the stage floor.
The plate of glass, E, Fig. 3, passes perpendicularly through the
stage down to a double block and tackle. The end of the cable is
attached to a drum or windlass and the plate glass held steady
with guides at the sides of the slot in the stage floor, through
which it passes. The winding up of the cable naturally forces the
plate glass and cradle up, causing the lady to rise.

Some illusionists place the lady on a board on two ordinary
trestles and cause the board to rise with the lady

[Illustration: Direction the Hoop Takes In Passing over the Board]

on it, as shown in the illustration, thus obviating the use of
heavy paraphernalia as in the cradle attachment. The cradle
attachment is also generally accompanied by a 2-in. iron bar, used
in the place of the plate glass, the performer or operator
standing at the rear of the couch to conceal the bar as it comes
from beneath the stage. However, the method illustrated is the one
generally used.

The solid hoop is passed over the body in the following manner:
Start at the end, B, Fig. 2, passing the hoop as far as C with the
hoop on the outside of the back horizontal rod. The side of the
hoop toward the audience is then turned and swung clear around
over the feet at A and entered between the rod and board on which
the lady rests. The hoop is then carried as far as it will go back
toward the end B. Then the side nearest the operator is passed
over the head of the body apparently the second time and passed
off free at the feet. Thus to the closest observer the impression
is given that the hoop has encircled the lady twice. The
illustrations give in detail the working of the illusion above the
stage floor. No set rule is used for the tackle and drum below the


Accelerometer, Simple 93
Acid Burns, Treating 126
Acetylene Gas Generator, Homemade 57
Acetylene Lamp, Lighting 401
Aerating Water in a Small Tank 241
Aeroplane, Paper, How to Make 329
Aeroplanes, Model, Equilibrator for 11
Alarm, Burglar, How to Make 368
Alarm, Callers' Approach 87
Alarm Clock Chicken Feeder 79
Alarm Clock to Pull Up Furnace Draft 107
Alarm, Electric 94
Alarm, Electric, Door Bell and 114
Alarm, Electric Fire, How to Make 430
Alarm, Electric, That Rings Bell and Turns On Light 337
Alarm, Electric Time 433
Alarm, Fire 47, 359
Aluminum Polish 428
Aluminum, Satin Finish on 198
Aluminum Wire, Insulating 306
Ammeter, How to Make 49, 203
Amusement-Boys Representing the Centaur 173
Amusement Device - Merry-Go-Round Thriller 209
Amusement Device - Merry-Go-Round, To Build 359
Amusement Device - Teeter Board. Revolving 297
Anesthesia, Electric 445
Animals, Small, Trap for 82
Annealing Chisel Steel 362
Annunciator, How to Construct 57, 416
Aquarium, How to Make 64, 210
Arbor, Grape, How to Build 73
Arc Lamp, Homemade 132
Arc Searchlight, Self Lighting 9
Arms and Armor, Imitation:
Part I 235
Part II 242
Part III 248
Part IV 263
Part V 271
Part VI 279
Part VII 284
Arms, Drip Shield for 258
Arrowhead, Flint, How to Make 23
Asbestos Table Pads, Homemade 212
Athletes, Weights for, How to Make 274
Atomizer, How to Make 158
Automobile, Boys' Homemade 402, 430
Automobile Engine, Cooling Water for 236
Automobile, Greasing the Front Wheels of 320
Automobile Headlights, Adjusting 217
Automobile, Painting 357
Automobile with Sails 326
Axle, Cart without 291

Babbitt Ladle, Emergency 264
Babbitt, Ladle for Melting 173
Bag, Changing, for Plate Holders 212
Bag, Sewing, How to Make 386
Bags, Paper, Use for 19
Balloon Ascension Illusion 300
Balloon, Pilot, How to Make 118
Balloons, Paper, How to Make 215
Barometer, Homemade 151
Barometer, How to Make 188
Barrel Stave Hammock 75
Barrel Stave Sled 383
Baseball, Playing with a Pocket Knife 250
Baseball Throwing Practice, Device for 312
Bath. Shower, To Make 15
Bathtub Stopper, Substitute 429
Batteries, Connecting Up to Give Any Voltage 93
Batteries, Dry, To Obtain Cheaply 410
Batteries, Dry, To Renew 369, 378, 401
Batteries, Gravity, Why Fail 115
Battery Binding Posts, Wire Loop Connections for 449
Battery Cell. Dry, Making 160
Battery Connections, Wire Terminals for 168
Battery, Grenet, How to Make 83
Battery Motor, Controller and Reverse for 72
Battery Motor, Reversing 405
Battery, Non-Polarizing, How to Make 151
Battery Rheostat 80, 445
Battery, Small Storage, How to Make 121
Battery Switch 99
Battery, Thermo-Electric, How to Make 59, 140
Battery Voltmeter 153
Battery Zincs, Old, To Use 87
Bed Warmer. Electric, How to Make 338
Beeswax, Substitute for 129
Bell, Cracked, Restoring Tone to 71
Bell, Return Call, with One Wire 101
Bell Ring Register 316
Bell, Ringing by Touching a Gas Jet 403
Belt, Eyelets for 432
Belt Lace Caution 239
Belt, Round, To Make without Ends 243
Bench Lathe Made of Pipe Fittings 316
Bicycle Catamaran 145
Bicycle Coasting Sled, How to Make 231
Bicycle Frame, Enameling 385
Bicycle, Runners on 157
Bicycle, To Attach a Sail to 425
Bicycle, Trailer for 397
Bicycle Trouser Guards for Sleeve Bands 283
Bicycle. Water, How to Make 335
Bill File Made of Corkscrews 315
Bind Magazines, To 40, 56, 406
Bird House, Proper Design for 201
Bird Houses, Clay Flower Pots Used for 277
Bit, Gouge Used as 411
Blotter Pad, Corner Pieces for 8
Blotting Pad, Desk 17
Blowpipe, Homemade 428
Blueprint Lantern Slides, How to Make 120
Blues, prussian and Chinese 401
Boards, Joining 268
Boat-Bicycle Catamaran 145
Boat-Canoe, How to Make 451
Boat-Catamaran, Cruising 423
Boat, Ice, How to Build 357, 382
Boat, Paddle, How to Make 100
Boat, Paper, How to Make 321
Boat-Punt, Homemade 123
Bobsled, Homemade Yankee 408
Bolts, Rusted 151
Book Cover, Paper, How to Make 126
Book Holder 32
Book, Removing Grease Stains from 230
Book Rest 292
Bookcase Doors, To Keep Closed 377
Bookmark 379
Bookmark, Brass 18
Bookmark, Paper Clip 241
Books. How to Carry 409
Boomerangs, How to Make 4, 202
Bore a Square Hole, How to 179
Boring Holes In Cork 8
Bottle, Cutting Thread inside of 179
Bottle, Diving 331
Bottle, Inverted, Withdrawing Paper from Under 33
Bottle, Photographing Man in 74
Bottle Pushing on the Ice 409
Bottles, Round End. Base for 29
Bottle Stopper, New Way to Remove 224
Bowl, Copper, How to Make 185
Box Cover. Sliding, Fastener 256
Box, Fishhook 379
Box, Magic 7
Box, Water Color 257
Boxes, Rustic Window 30
Bracket Saw, Cheap, How to Make 42
Brass Bookmark 18
Brass, Cleaning 407
Brass Flag, Ornamental, How to Make 266
Brass Frame In Repoussé 237
Brass Furnace, How to Build 115
Brass, Piercing Punch for 19
Brass Plaques, Photo Silhouette, Making 217
Brass Surface, Flat, Polishing 229
Brass Work-Candlestick, How to Make 325
Bread, Loaf, Cutting 36
Bronze Liquid 329
Brooder for Small Chickens 343
Broom Holder 13
Broom Holder Made of a Hinge 33
Broom, Old, Crutch Made of 352
Brush, Counter, for a Shop 419
Brush, To Keep from Spreading 367
Brushes, Paint, Care of 267
Bulb on a Glass Tube, To Make 324
Bunsen Cell, How to Make 206
Burglar Alarm, Simple, How to Make 368
Burning Inscriptions on Trees 45
Burns, Carbolic Acid 126
Button, Changing into a Coin 234
Button. Removing from Child's Nostril 237
Buttonhole Trick 234

Cabinet for Pot Covers 16
Cabinet for Phonograph Records 483
Cabinet, Music, How to Make 77
Cabinet, Phonograph Disk Cabinet 79, 433
Calendar, Handy 196
Calliope, Steam, How to Make 418
Camera, Box, Repairing 379
Camera, Enlarging from Life in 111, 117
Camera, Homemade Kits for 159
Camera, Making Light proof 58
Camera, Practical, for Fifty Cents 365
Camp Stool, How to Make 222
Camp, Tin Drinking Cup for 379
Camper's Lantern, Makeshift 266
Camps and How to Build Them 341
Camps, Keeping Food Cool in 21
Can Covers, Tool for Lifting 352
Candle Shade, How to Make 191
Candlestick, How to Make 240, 281, 325
Candlestick, Water 406
Cane Chairs, How to 259
Cane in Furniture, Tightening 230
Cannon Balls, 36, Removing from Handbag 256
Cannon, Gas 197
Cannon, How to Make 42
Cannon, Lead, How to Make 338
Cannon, Toy, To Discharge by Electricity 59
Canoe, How to Make 451
Canoe, Sailing, How to Make 199
Cans, Tomato, Irrigating with 450
Canvas Cot, Folding, How to Make 154
Canvas, Waterproofing 146
Carburetor Difficulties 208
Card Trick, Rising 256
Card Trick with a Tapered Deck 70
Cardboard Spiral Turned by Heat 226
Cardboard Squares. Gun for Throwing 269
Cardcase, Lady's, How to Make 350
Cards, Mechanical Trick with 63
Carpenter's Gauge 19
Carpenter's Vise, Homemade 36
Carpet Sweeper Wheels, New Tires for 266
Cart, Dog 60
Cart without an Axle 291
Catamaran, Bicycle 145
Catamaran, Cruising 423
Catapult, Fourth of July 447
Cats, Shocking, Device for 411
Cell, Bunsen 206
Cell, Daniell 252
Centaur. Boys Representing 173
Centering, To Make Unnecessary 319
Chain Made from a Match 377
Chair, Child's Footrest on 453
Chair Legs. Rubber Tip for 229
Chair, Porch Swing 128
Chair Rockers, Safety Tips on 429
Chair Sleighs 383
Chairs, Balancing on 131
Chairs, To Cane 259
Checker Board Puzzle 189, 233
Cheese box Cover, Tea Tray 18
Chemicals. Protecting Fingers from 283
Cherry Seeder 29
Chicken Coop. Keeping Rats from 352
Chickens, Drinking Trough for 454
Chickens, Feed Box for 292
Chickens. Small, Brooder for 343
Chisel, Ice 61
Chisel, Steel, Annealing 362
Chopping Board 19
Christmas Tree Decorations, Repairing 11
Churn, Homemade Small 192
Clamp, Magazine, How to Make 435
Clamping a Cork 33
Clamps, Homemade Soldering 137
Cleaner for Gloves 302
Cleaner for White Shoes 239
Cleaning Brass 407
Cleaning Discolored Silver 344
Cleaning Furniture 185
Cleaning, Glass, Solution 31
Cleaning Jewelry 353
Cleaning Leather on Furniture .13
Cleaning Silver 305
Cleaning Walls 375
Cleaning Woodwork 315
Cleats, Insulating, Substitute for 348
Clock, Electric, How to Make 268
Clock, Homemade Novelty 446
Clock, How to Clean 119
Clock, Novelty, for the Kitchen 360
Clock, Old, Use for 367
Clothes Rack 14
Clothesline, Double, Support for 318
Coaster, Roller, Illusion 298
Coaster, Trolley, How to Make 387
Coasters and Chair Sleighs 383
Cock, 'l'hree Way, for Small Model Work 50
Coil. Jump Spark 113
Coils, Forming to Make Flexible Wire Connections 443
Coin and Card on the First Finger 175
Coin and Tumbler Trick 378
Coin, Changing Button Into 234
Coin, Disappearing 176, 193
Coin In a Wine Glass Trick 167
Coin, Moving under a Glass 214
Coin Purse, How to Make 354
Coin, Sticking against Wall 176
Coin, Sticking to Wood by Vacuum 287
Coins, Display Rack Shows Both Sides of 220
Coins, Sending by Mail, Safe Method of 287
Compass, Mariner's 170
Compass Needle, Floating 160
Compass, Substitute for 289
Compressed Air Phenomenon 111
Concrete Kennel 23
Concrete Swimming Pool 178
Conservatory, Window 103
Controller for a Small Motor 42
Cook Fish, One Way to 206
Copper Bowl, How to Make 185
Copper, Hardening 206
Copper Picture Frame, Etched, How to Make 414
Copper Trays, How to Make 180
Copper Work - Corner Pieces for a Blotter Pad 8
Cord. Buttoned 427
Cork, Boring, Holes in 8
Cork, Clamping 33
Cork Extractor 300
Corks, How to Fit 368
Corkscrews, Bill File Made of 315
Corner Pieces for a Blotter Pad, How to Make 8
Cot. Canvas, How to Make 154
Counter Brush for a Shop 419
Crossbow and Arrow Sling, How to Make 339
Crutch. Homemade 369
Crutch Made of an Old Broom 352
Crystallization, Instantaneous 288
Cup and Saucer Rack, How to Make 105
Cup, Tin Drinking, for the Camp 379
Current Reverser 107, 111
Curtain Roller 419
Curtain Roller Spring, How to Tighten 79

Dance, Miniature War 255
Darkroom Lantern, Homemade 14, 340
Darkroom, Photographic, Building 26
Demagenetizing a Watch 166
Desk Blotting Pad 17
Developing Box, How to Make 220
Developing Tray, Cracked Composition, To Repair 260
Developing Tray. Photographic 269
Dish Holder, Hot 7
Dogcart, Homemade 160
Dog, How to Chain 257
Dog's Bark, Drowning with Water 435
Dogs, To Drive Away 106
Door Bell and Electric Alarm 114
Door Lock, Secret 6
Door Opener, Electric 78
Door Opener for a Furnace 83
Door, Sliding, Electric Lock for 89
Dovetail Joint 29
Dovetail Joint Puzzle 236
Draft Opener, Automatic 102
Draftsman. Spline for 406
Draftsmau's Ink Bottle Cork, Steel Pen Used In 117
Drawers, Several, Locking with One Lock 314
Drawing, Aid In 270
Drawing Instrument-Wondergraph, How to Make 436
Drawing, Landscape, Made Easy 449
Drill Gauge, Handy 252
Drill, Hand, How to Make 444
Drinking Cup, Tin, for the Camp 379
Drinking Trough for Chickens 454
Drip Shield for the Arms 258
Dry Batteries, Another Way to Renew 378
Dry Batteries, Cheap, How to Obtain 410
Dry Batteries, Old, To Renew 401
Dry Batteries, Renewing 367
Dry Battery Cell, How to Make 160
Duplicator for Box Cameras 363
Duplicator, Homemade 240

Easel, How to Make 415
Egg-Beater, How to Make 291
Eggshell Funnel 93
Eggshells, How to Preserve 288
Elderberry Huller, Homemade 323
Electric Alarm 94
Electric Alarm, Door Bell and 114
Electric Alarm That Rings a Bell and Turns On a Light 337
Electric Anesthesia 445
Electric Apparatus-Ammeter, How to Make 49, 203
Electric Apparatus-Annunciator, Homemade 57
Electric Apparatus-Annunciator, How to Construct 416
Electric Apparatus-Batteries, Connecting Up to Given Any Voltage 93
Electric Apparatus-Battery Rheostat 80
Electric Apparatus-Battery Voltmeter 153
Electric Apparatus-Bell, Return Call, with One Wire 101
Electric Apparatus-Cats, To Shock 411
Electric Apparatus-Cell, Daniell 252
Electric Apparatus-Circuit Breaker for Induction Coils 101
Electric Apparatus-Controller and Reverse for Battery Motor 72
Electric Apparatus-Controller for a Small Motor 42
Electric Apparatus-Current Reverser 107, 111
Electric Apparatus-Galvanometer, Tangent 150
Electric Apparatus-Induction Coil, How to Make 138
Electric Apparatus-Induction Coils, Mercury
Make and Break Connection for 187
Electric Apparatus-Jump Spark Coil 113
Electric Apparatus-Medical Induction Coil, How to Make 63
Electric Apparatus-Motor, Single Phase Induction 124
Electric Apparatus-Motors, Direct Connected Reverse for 60
Electric Apparatus-Rheostat, Lead Pencil 145
Electric Apparatus-Shocking Machine 139
Electric Apparatus-Thermo Battery, How to Make 59
Electric Apparatus-Thermostat, Small 455
Electric Apparatus-Transformer, 110-Volt 439
Electric Apparatus-Voltammeter, Pocket 330
Electric Battery Massage, Homemade 144
Electric Bed Warmer, Homemade 338
Electric Bell, Relay Made from 94
Electric Blue Light Experiment 47
Electric Clock, Homemade 268
Electric Charges, Detector for 281
Electric Door Opener 78
Electric Engine 276
Electric Experiment, Interesting 377
Electric Experiment, Reversing Switch for 92
Electric Fire Alarm, How to Make 430
Electric Furnace Regulator, How to Make 388
Electric Furnace, Small, How to Make 48
Electric Heat Regulator, Automatic 344
Electric Horn, How to Make 218
Electric Hydrogen Generator 54
Electric Illusion Box 135
Electric Indicator for a Wind Vane 348
Electric Lamp Experiment 53, 120, 131
Electric Lamp Sockets, Miniature, How to Make 270
Electric Lamps, Miniature 434
Electric Lamps, Testing 314
Electric Light Circuit, Experiments with 50
Electric Lighting, Miniature 104
Electric Lights, Turned On and off from Different Places 205
Electric Lock 60, 110
Electric Lock for Sliding Door 89
Electric Lock, Simple 60
Electric Locomotive, Miniature, How to Make 165
Electric Motor 401
Electric Motor, Novel 395
Electric Motor, Small 214, 222, 345
Electric Pendant Switch, How to Make 310
Electric Piano, How to Make 247
Electric Plug, Homemade 430
Electric Postcard Projector 195
Electric Rat Exterminator 358
Electric Shock, To Give While Shaking Hands 133
Electric Shocker for Garbage Cans 94
Electric Stove. Homemade 31, 273
Electric Terminals, Varnish for 376
Electric Time Alarm 433
Electric Toaster, How to Make 37
Electric Walking Stick 413
Electric Wires, Flexible, Adjuster for 386
Electricity, To Discharge Toy Cannon by 59
Electricity; To Explode Powder with 53
Electricity, Writing with 74
Electrodeposition, Copies Made from Wax Molds by 157
Electrolytic Rectifier, How to Make 197
Electromagnet, Floating 152
Electroplating, Easy Method of 88
Electroscope, How to Make 103
Electrostatic Illumination 299
Emery Wheel Arbors, Washers for 359
Enameling a Bicycle Frame 385
Engine, Electric 276
Engine, Gasoline, How to Make 207
Engine, Model Steam 1
Engine, Steam, Made from Gas Pipe and Fittings 184
Engine, Toy Steam, How to Make 73
Engine, Turbine, How to Make 355
Equatorial, Homemade 204, 253
Equilibrator for Model Aeroplanes 11
Experiment, Center of Gravity 302
Experiment, Electric 377
Experiment, Electric Blue Light 47
Experiment, Heat and Expansion 124
Experiment, Phonograph 105

Online LibraryPopular Mechanics Co.The Boy Mechanic: Volume 1 700 Things for Boys to Do → online text (page 52 of 54)