INDEX TO VOLUME 91
��Page Why a Sidewalk Was Built on the Top of a Storm- Sewer Tunnel 746
Building a Park Around the Debris of a Burned- Down Schoolhouse 722
Two Billion Paving Bricks a Year 855
Measuring the Flow of Rivers 867
ELECTRICITY
Electrified Street Directions 33
An Effective Burglar Alarm 49
Cooling a Room with Cold Water 62
An Electric Machine for Cutting Uniforms 71
Newspapers in the Sky 104
A Telephone Attachment Which Performs the Ser- vices of a Watch Dog . . . . 105
Seal Your Letters by Electricity 114
Applying Insulation to Splices Made in Electric
Wires 147
A Simple and Easily Made Electric Battery Motor 147
Rebuilding Worn-Out Dry Battery Cells. 148
Method of Insulating Secondary "Pies" in Trans- formers 1 49
Steadying Voltage of Dynamo Driven by Gasoline
Engine 150
Increasing the Voltage of a Dry Battery 150
Keyless Lamp Socket for Switching Electric Cur- rents , 151
The Effect of Electricity and Music on the Human
Organism 152
A Rain Alarm Made of a Broken Electric Globe . . 152 Protect Yourself Against Highwaymen with an
Electrified Cane 191
An Electric, Self- Winding Clock 222
A Light for Luring Fish 233
The First Life-Long Flashlight 240
A Flashlight Attached to Your Razor 251
An Electric Cord for the Sash Curtain 280
Simple Oscillograph to Record Current Alternations 284 Reversing Rheostat for Controlling a Small Motor 309
A Drip-Pan Alarm for the Ice-Box Drain. 311
The Electric Stevedore 328
Telephoning from a Trolley-Car 353
The Ben Franklins of Today 363
The Electric Manicurist 400
Increasing England's Crops by Electricity 421
The Price of This Kiss Was Death 432
A Method for Recharging Dry Cells 442
His Lighting Bill Is Twenty-five Cents a Month. . 536 "Do It Electrically" Also Applies to the Barber. . 538 Using Resistance in Field Wiring on Automobile
Dynamo 606
Connecting a Spot Light in an Automobile Dynamo
Circuit 613
Electric Lamp Attached to a Spoon for Tongue
Depresser 618
This Electric Heating Faucet Has No Switch or Coils 668 An Electric Wire in the Street Ignites a Balloon. . 670 Using an Electric Heater to Dry the Glue on En- velopes 672
Announcing the Election Returns by Telephone . . 740 Making Telephones and Phonographs Clearer.... 745 Click! Click! Go These Electrically Operated
Scissors 748
Telegraphing by Typewriter 756
Automatic Cut-Outs for Charging Storage Cells . . 789
A Practical Electric Vacuum Cleaner 791
Making an Electric Furnace for the Laboratory . . 792 Testing Electric Wires for High Tension Currents . 797 Resistance in Circuit to Make Double Tone Auto- mobile Horn 797
Making a Selenium Cell for the Laboratory 799
A New Way of Oiling Machinery by Electiicity. . 825
Illuminated Muffs 881
Combining an Electric-Elevator with the Shoe- Shining Chair 888
Applying the Principle of the Phonograph to the
Telegraph Sounder 889
Reducing Packing Costs in Handling Telephone Sets 908 A Telephone Conversation May Be Almost "Pri- vate" Nowadays 913
Telephone Conversation Made Easy by a New De- vice 919
Charging Storage Batteries with Direct Current . . 947
Simple Method of Making Storage Cells 947
Auto-Transformer in Headlight Circuit on a Mag- neto 952
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Making a Good Outdoor Ground to a Pipe 952
Finding the Combined Value in Parallel Resistances 959 Heating a Soldering Iron with an Electric Arc. . . . 960
HOUSEKEEPING MADE EASY
Save Your Bottles. A Shortage of Jars and Cans
Is Threatened 37
Not Even the Space Underneath This Desk Is
Wasted 37
A Machine for Ironing Stockings 49
Household Appliances 52-53
A Tea-Making Machine 66
Using Your Player Piano as a Vacuum Cleaner. . . 72 Changing the Apartment Telephone into a Pay- When- You-Call System 86
Alarm Which Tells You When Your Bathtub Has
Been Filled to Whatever Depth You Desire ... 87 Combining a Strainer with the Bung of a Barrel . . 90 Making the Kitchen Range One Hundred Per Cent
Efficient Ill
A Clever Bottle-Opener 1 90
Co-operative Kitchens to Solve the "High Cost"
Problems 198
Children May Write on" These Walls Without Fear
of Punishment 204
An Electric Fan Runs Without Electricity 217
Household Appliances 238-239
Keeping Out Flies When You Open the Door. . . . 260 Household Bookless Bookkeeping on the Poker- Chip Principle 267
Put Your Flowers Outdoors on this Adjustable
Window Shelf 271
Hanging Backing Cloth for Wall Paper 283
A Double Deck Revolving Clothes Hanger for a
Yard 287
Iceless Refrigerator Using Evaporation for Cooling 289 Sterilization Is the Essential Factor in Canning
Vegetables 290
The Burlap Cooler 351
Scrub Your Walls by Machinery 360
Housekeeping Made Easy 372 -3
An Approved Smoker's Kit 410
A New Attachment to Hold the Trousers in Place 420
A Handy Clothes Closet for Your Vacation 424
The Clam-Shell as a Decoration 43 5
That Bit of Butter Left on Your Plate— What
Becomes of It? 519
This Vacuum Cleaner Is Used Like an Ordinary
Broom 519
Housekeeping Made Easy 552-553
Fountain Spot-Remover Works Like a Scrubbing
Brush 568
An Owl with Eyes of Scissors and Backbone of Paste 576 You Can Roll This Can Without Spilling the Gar- bage , 593
A Wooden Lighthouse Candlestick and How It Is
Made. 600
Sending the' Wash to the Laundry Through a Glass- Lined Chute 664
The Full Dinner Pail 669
An Accommodating Gas Stove 670
What to Do with That Dripping Umbrella 671
Keeping Your Neckties Smooth 672
New Can-Opener Which Does Not Destroy the Can 679
Housekeeping Made Easy 694-695
A Necktie Rack 702
Cook Over the Gas Lamp 72 I
Making a Window Seat Out of the Radiator 725
Dry Your Fruits and Vegetables at Home 736
Carry Your House Key in Its Own Bag ........ 736
The Kitchen Cabinet Up-to-Date 742
The Temperature Alarm 747
Keeping the Shampooing Soap Suds Out of Your
Eyes 804
Storing Needles and Thread in the Handles of
Scissors 828
Solving Kitchen Problems Electrically 830
Abolishing the Garbage Can 833
Rocking the Baby Fore and Aft ... 842
New Shoe-Polishing Kit 857
Improved Office Appliances 870
Electric Fish-Sealer 873
Baby's Wheeled Dressing Table 877
Housekeeping Made Easy 890-91
A Pelican in Your Wardrobe to Hold Your Coat. . 904 Want to Go to the Attic? Just Pull Down the Stairs 912
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