INDEX TO VOLUME iH 



CHEMISTRY Page 



Tobacco as a Cleanser 67 



Making Paper from Crass 3 



"German Silver" Is Silver in Name Only 11/ 



Mixture to Make a Strong Waterproof Clue 126 



Explosives Are Simpler Than They Seem 166 



Softening Water by Filtering It 236 



Killing the Boll-Weevil with a Deadly Gas 261 



Fire-Fighting Suit of Asbestos Cloth 325 



Invention of New Steel Like Military Victory. 325 



Unlimited Heat— But How Use It? 344 



America Needs Potash 362 



What Imitation Leather Is 380 



Varnish and Varnishing 402 



We Are Making Our Own Indigo Now 400 



Honey of Crapes 432 



This Regulator Will Keep Your Apparatus at a 



Constant Temperature 569 



Wood that Gives a Wonderful Fluorescence to 



Water • •. 576 



Detecting Glucose in Jellies, Jams and Kindred 



Confections 577 



Wash In the By-Products of Garbage 58/ 



Kerosene Can be "Cracked" to Produce Gasoline 593 



A Chemical Preparation to Preserve Cut Flowers 601 



Making Animals Transparent 678 



The Making of Watches 693 



Why Bricks Are Made with Straw 703 



Chemicals and Machines Supplant Men inThisWar 744 



Laundrymen and War Conditions 754 



Less Risk in Kerosene Than Gasoline 758 



The Process of Making Parchment Paper 806 



Making Soap from Table Refuse 837 



Inexpensive Aluminum Polish 923 



CIVIL ENGINEERING 



A Roller for Concrete Roads 51 



Waste Boot Leather for Road Making 66 



Launching a Bridge-Pier Caisson 89 



Spraying Asphalt by Hand 101 



Building Eiffel Towers in the Philippine Jungle 204 



A Bridge Having a Single Row of Supporting Posts 229 



Rolling Roads with Gaspipe 379 



What Is Mean Sea Level? 408 



Trapeze Artists Among Telephone Poles 414 



Cost of Placing Roadway Stone Reduced by Simple 



Spreader 52i 



ELECTRICITY 



If You Value Your Life Be Careful with Electricity 4 



Clap ! Let There Be Light 26 



An Electric Blanket 33 



Warming an Aquarium Electrically 65 



Light Your Gas with Electricity 95 



The Electric Floor-Scrubber 96 



One Man. with an Electric Monorail. Does the 



Work of Ten Men with Trucks 108 



A Homemade Electric Lantern for a Dry-Battery 



Cell 149 



Electrical Devices and How They Work. 151 



An Electric Torch Made of Bottle and Bichromate 



Solution I 56 



All Kinds of Commotion at Theater: Electric Signs 



Cause It .203 



Removing a Fuse from the High-Tenaion Mains 



Without Danger of Shock 229 



At Lastl A Noiseless Telephone 247 



A New Portable Electric Light for Manhole Work 248 



The Electric Stevedore Distributes the Mail 265 



Drawing Twenty Shades at Once 274 



A Trolley Hoist for Handling Coal 278 



Constructing a Dry Cell Which Can Be Renewed. 308 

 How to Make an Electric Laboratory Furnace . . 309 

 Finding the Polarity of Electric Wires with a Potato 3 1 

 A Spark Plug Tester with an Inclosed Spark Gap 310 

 Electrical Devices and How They Work 311 

 Making a Wet Battery from Ordinary Dry Cells. . 312 

 The Normal Running Temperature of Electric Ma- 

 chines 316 



The Secret of Those Curly Locks 323 



Pushbutton Lamp-Switch 364 



Thr Thief's "Hands-Upl" Is Answered by the Tele- 

 phone's "Helpl" 424 



Look Into the Mysterie* of • Mold with an Electric 



Trowel 431 



Playing Chimes by Electricity 435 



An Electric Lantern Which Will Stand Rough Use 440 



Page 



Drying Shoes with Heat from an Electric Globe . . 455 



How to Make a Flashlight of Dazzling Brilliancy 466 



An Electric Bell Signal to Indicate Falling Snow. 467 



Electric Toaster to Operate on Dry Batteries 468 



Electrical Devices and How They Work 469 



The Sleeper Must Get Up to Stop the Alarm 471 



Making Small Generators from Telephone Mag- 

 netos 472 



An Improved Design for a Grounding Switch 474 



Electric Blasting Without Blasting Machine 487 



Teaching High School Pupils How to Read the 



Gas and Electric Meters . . 504 



Electricity Makes the Winding of Bandages Easier 548 



Oh, Henry — What Makes Those Things Go 'Round 553 



Electricians Should" Wear Straw Hats at Work. . 582 



Electric Alarm Signal for Transmission Ropes. . . . 627 



Changing the Tone of an Electric Bell by Sawing It 628 



Tightening Electric Wires Under Wood Cleats . 628 



Electrical Devices and How They Work 629 



A Small Storage Battery Made with a Sponge. . . 631 



A Keyless Electric Lock for Use on a Panel Dooi . 640 



Don't Let Your Baby Suck the Telephone Cord! . . 670 



An Electrical Cooker for the Kitchenette. ...... 673 



Cleaning Billiard Tables by an Electric Brush. . . 685 



Staircase Burglar Alarm 688 



New Uses for Blue Electric Bulbs 696 



Fish at Night with an Electric Light on Your Line . 735 

 Static Electricity Drawn from Paper by Alternat- 

 ing Charge 748 



Telephone and Telegraph Service Held Up 753 



An Electrically-Heated Inhaler 792 



Ignition Hookup for Use on Automobile Circuits. . 792 



Electrical Devices and How They Work 793 



Interesting and Artistic Electric Battery Tester . . . 795 



Permanent Base for Small Battery Switches. . . 800 



Opera Hat with Enclosed Electric Light for a Sign . fiOO 



Electric Sparks Peel the Tomatoes 897 



Saving Time in Insulating Electric Cables 918 



What Is the "Dead" Lamp on a Series Circuit? 920 



Cleat for Holding Temporary Electric Wires 947 



An Electrically Driven Toy Tank That Goes 



"Over the Top" 947 



Durable Terminals for Electrical Conductor Cords 948 

 Shocking Device That Works on the Commercial 



Current 948 



Locating and Repairing Short-Circuited Armature 



Coils 948 



Electrical Devices and How They Work 949 



Combined Electric Night-Bell and Flash-Light . . . 952 



Self-Translating Telegraph Line for Amateurs. . . . 952 

 Interesting Method of Learning the Telegraph 



Code 954 



Home-Made Electric Furnace for Heating with Arc 



Light 955 



Simple Way of Cutting Mica V-Rings to Fit on an 



Armature 955 



Holding Clip for Making Tests on Spark Plugs ... 956 



Controlling an Oil Cup with an Electromagnet . . 956 



HOUSEKEEPING MADE EASY 



The Bachelor's Coffee Brewer 7 



Cut Your Ice Silently and Easily with a Needle . 12 

 Sharpen Your Own Shears and Save Your Time and 



"Temper 27 



Housekeeping Made Easy 40-41 



Household Appliances 53 



A New-Old Cooker 68 



One Movement, and Up Goes This Sturdy. Collaps- 

 ible Ironing Board 88 



A Needle That You Can Easily Thread in the Dark 99 



Here's a Quick Device for Extracting Corks 109 



Turn the Switch and You'll Have All the Hot 



Water You Will Need 110 



You Can Attach This Humidifier to Your Radiator I I 7 

 Cook a Breakfast for Six on One Fourth of a Cent 224 



A Coal Stove Within Your Furnace 228 



The Bag Within the Garbage Can 253 



Housekeeping Made Easy 258-259 



Adjustable Chair for the Bathtub 327 



Housekeeping Made Easy 360 361 



Sleeping in Your Library Table 587 



A Metal Bottle-Cover That Never Wears Out . 407 



Pasteurizer and Ice-Box Combined 420 



Adjustable Player-Piano Seat and Record Holder. 431 



Cook with Acetylene on the l-'urni 434 



Safety Bottle lor Poisons 504 



Housekeeping Made Easy 522-523 



