INDEX TO VOLUME 89 



Page 



Timing an Automobile Race 753 



Backing an Automobile into a Moving Garage . . . 755 



Constructing a Sidecar for a Bicycle or Motorcycle 765 



Fillers for the Pedal Slots of Automobiles 783 



Lubricating Automobile Spring Shackles and Bolts 783 

 Estimating the Speed of Passing Automobiles. . . . 784 

 Making a Sediment Pocket in Feed Line to Car- 

 buretor 784 



Caring for Storage Batteries on Automobiles 792 



Novel Method of Drive for Light Cycle-Cars. . . . 806 



Timing Automobile Speed Demons 806 



A Wonderful New Glass Which Cannot Be 



Shattered 811 



An Automatic Safety Fender Sets the Brakes .... 836 



A Floating Road for Automobiles 864 



The Intelligent Motor Milk-Wagon 869 



Twelve Cylinders or Six in One Car 872 



Plowing Snow with Your Automobile 882 



Automobiles, Motor-Trucks and Accessories . 888 — 891 



An Automobile Pump Drive from the Rear Wheel 895 



The Tiniest Motorcycle to Be Used in the Army . . 896 



Preaching the Gospel from an Automobile 906 



Tank Trucks as Tenders to Submarines 906 



Testing the Strength of an Ostrich 907 



A British Motor-Bus Run on Coal Gas 912 



A Motor-Driven Brake 914 



Wire Wheels for Automobiles 915 



Combination Lamp and Horn for the Motorcycle . . 920 



Automobile Carbureter for Heavy Fuel Oils 936 



BOATING 



Your Mainsail and the Wind 49 



Forty Miles an Hour on the Water 83 



How to Run a Motor-Boat 112 



CHEMISTRY 



Asphyxiating a Fire with Sulphur 884 



Producing the Coldest Cold 916 



A Quickly Made Silver-Plaiing Powder 937 



How to Handle Sulphuric Acid with Safety 945 



CIVIL ENGINEERING 



The Destruction of the Exposition City 8-11 



A Ticklish Moment 29 



"Ironing Out" Earthquake Wrinkles in San 



Francisco 31 



An Inverted Steam Hammer for Drawing Piles. . . 53 



Saving Hours in Handling New York Subway Dirt 54 



An Excavator Which Walks 61 



Electrifying the Clam-Shell Bucket 87 



Making Water Pump Itself 98 



A Damaged Lock Gate Repaired by Its Own Water 234 



Lowering a Bridge Without Blocking the Traffic. . 240 



Uncle Sam's New Dam at Elephant Butte 259 



A Substantial Cablcway Built from Scrap Material 327 



The Senators' Subway 328 



Bagging Rivet Heads with a Butterfly Net 333 



Blowing Concrete into Place 411 



Safeguarding the Sand Blaster 418 



Building a Bank Around a Bank 485 



Holding the Hudson at Bay 537 



Road Construction Facts by the Wayside 544 



Solving New York's Freight Problem 546 



Ten Millions to Save Four Miles 553 



Transforming a Beauty Spot into a Public Utility 574 



A Bridge Five and One Half Miles Long 583 



Strenuous Search for Durable Roads in a St. Louis 



. Park 672 



Giant Slabs of Marble to Commemorate Abraham 



Lincoln 689 



Meerschaum as a Building Material in Spain 689 



Boring Straight by Photography 720 



Quebec's Disastrous Bridge 728 



Cleaning Sewers from the Street 838 



The Old-Fashioned Heavy Paving-Block Gives 



Place to a New Form 844 



Taking the Temperature of a Dam 866 



ELECTRICITY 



Wcldinif Soft Metal to Hard 17 



The Voice Typewriter 65 



An Exciter for Electroscopes 135 



Interference of Lighting Circuit bv Static F.lec- 



tricity 135 



Rejuvenating Electric Lamps. . .135 



A Wet Bottery from a Dry One .135 



Electric Striking Mechanism for Mission Clocks . 137 



Page 

 An Electrically Operated Device for Lighting Gas 141 



How to Make an Attachment-Plug 142 



A Model Electrical Hammer |42 



How to Make an Electric Shaving-Mug 1 43 



Testing Electric Lamps Quickly ] 44 



Using Cartridge Shells for Electrical Contacts. ... 144 



A Hoop with a Guiding Hub | 52 



Perfuming and Cooling the Air with An Electric 



Fan .■■■.■■. '75 



The King of New York s Lighting Spectacles 177 



A Tool for Buffing. Drilling and Grinding Metal 



Surfaces 192 



Toying with High Tension Currents 248 



A Home-Made Edison Battery 276 



A Clever Window Display 277 



Five Examples of Alarm Work 279 



Rectifying Alternating Current 283 



Making an Electric Fire Alarm 284 



Cutting Glass-Tubing by Electricity 311 



A One-Eyed Mechanical Stenograptier 335 



Why You Could Not Get Your Man on the Wire. . 371 



An Electric Motor-Chair 412 



A Convenient Arrangement for Turning on the Hall 



_ Light 442 



Wiring the Ford for Magneto and Battery 442 



A Simple Way to Construct a Ten-Ampere Shunt . . 443 

 Controlling Temperature and Humidity at the 



Same Time 444 



Electric Substitute for the Latch-key 444 



Making an Induction Coil 446 



Magnet Winder 446 



Dry Cells and Their Voltage 446 



Utilizing Broken Marble Pieces 446 



How to Rid Your Yard of Cats 447 



To Stop the Milk Thief 447 



A Simple Primary Coil 452 



A Heat-Resisting Socket for High Wattage Lamps 51 1 



Pocket-Flashlight Distress-Signals 520 



A Hand-Magnet That Lifts Fifteen 'Times Its Own 



Weight 536 



The Czar of the Power-House 555 



A New Electric Cloth-Cutter for Small Shops ... 564 

 The Electrical Scrub-Woman — Brainless but Effi- 

 cient 566 



Small Electric Pump for Draining Seepage from a 



Cellar 567 



A Voting Machine for Congress 5B2 



Flood Lighting Niagara 584 



The Nic:ht Eyes of the Coast Artillery 586 



A Warning to Fishermen 590 



A Photographic Printing-Box for Use with Electric 



Current 601 



A Simple Tracing Method for Electrical Draftsmen 606 



Tapping Field Telephone Wires 622 



Tracing Initials on Tools with Electricity 632 



Saving the Picture Show with a New Rheostat. . . 633 

 A Combination Front and Back Door Alarm-Bell . 634 

 Electric Burner for Making Storage-Battery Con- 

 nections 634 



To Change a Gas Lamp into an Electric Light. . . 635 



Lighting an Oil-Stove with an Alarm-Clock 635 



A Simple Electrical Device for Purifying Water. . 6?H 

 Lifting Street Cars with a Powerful Electric Hoist 67' 

 Electric Hand Lantern Costs Less than a Kerosene 



Burner - 68 ! 



Electric Ranges Are Becoming Popular 681 



Electrolytic Extraction of Gold from Black Sand. . 68() 

 Look Outt Perhaps the Man You're Talking to 



Wears a Detectaphone 687 



Protecting the Telephone Operator 706 



Telegraphing Through the Ocean 711 



Toys That Obey Your Voice 718 



Miniature Magnet-Propelled Ships 757 



Hearing Your Voice Through Your Bones '42 



Manhole Ventilated with Electric Fan 74H 



Reducing the Furnace Man to a Mere Push-Button 75 ■ 

 A Magic Wand Which Changes Cold Water into 



Hot Almost Instantly 7^- 



The Electric Thief-Catcher - • • ■ J^*' 



How Electricity and Temperature Affect • Watch 761 



A Hallowe'en Chamber of Horrors 77/ 



An Improvised Coil Winder for Electrical Ap- 

 paratus 787 



A Home-Made Fuse for a Small Battery Current. /'M 



Amateur Trench FJcctricians ' * 



A Danger Signal Used to Direct Attention '•> 

 Overhead Perils ^^'' 



