XVI 



INDEX TO VOLUME 88 



Page 



An Emergency Tire Made Simply of Rope 587 



Vulcanizing Tires with Exhaust Heat 593 



A Trouble-Proof Tire 593 



An Oil Cup for Auto Springs 593 



An Anti-CIogging Oil-Gage 593 



A New Way of Driving a Bicycle with a Motor . . 702 

 Converting an Automobile into an Apartment. . . . 719 

 The Chair Car — the Latest Development in Stage- 

 coaches /i" 



A Tomahawk Grease Gun 731 



Device Prevents Automobiles from Being Stolen. . 731 

 How a Second-Hand Automobile Made a Railroid 



Pay 732 



New Automobile Alarm Calls for Help 753 



This Grease Cud Keeos Your Hands Clean 75 5 



Converting a Motor-Cycle Into a Tricycle 757 



To Keep Your Foot Always on the Accelerator 



Pedal .., 757 



A Lamo for the Motorist's Glove 758 



Improving Automobile S^ri.igs 768 



Hints to the M jtor-Cyclist 770 



Fools Automobile Thieves 780 



An Automobile- Bed for the Tourist 870 



A New Ford Folding Bed 870 



Some Ingenious New Accessories for the Touring 



Car 870 



A Glass Hood for Autonnobiles 87 1 



A Handy Automobile Grease-Gun 871 



Rain Protector for Automobile Wind-Shield 871 



An Electric Automobile Built Like a Drop of Oil 896 



What Shall We Do for Gasoline? 904 



Curing a Noisy Automobile Hood 917 



BOATING 



The TroIIey-Car Boat for Bathers 725 



A Wheel-barrow for Canoes 744 



The Ozark Float-Boat 747 



How to Build and Sail a Small Boat 765 



Navigating a River Boat by Sound 90S 



How to Build and Sail a Small Boat 929 



CIVIL ENGINEERING 



Twelve Million Dollars for Twenty Minutes Train 



Time 7 



An Excavation for a Road Leaves House on Brink 17 



Two Biidges with but One Approach 20 



A Vast Tank with a Park on Top 20 



A Really Greater New York 60 



The Longest Pipe Line in America 93 



A Gigantic Steel Bridge- Beam 166 



Niagara on Tap 180 



Lifting a House Over Trees: Sentiment vs. Cost. . 247 



The Giant Task of the Subway Diggers 326 



Three Slender Wires Form a Bridge 342 



A Circular Bridge on Stilts 377 



The Bridge that Telephones Built 403 



An Elevated Road that Tried to Outstrip a Town. 421 



Digging Away the Slides at Panama 492 



Amputating Pittsburgh's "Hump" 532 



Workmen Shot from Tunnel Through the Bed of a 



River 643 



Rocking a Three-Hundred Foot Tower ^vith Your 



Hand 645 



Spraying Concrete 665 



New York's Submarine Subway and How It Was 



Built 70S 



Making Money Out of Waste Land with a Stream 



of Water 720 



Panama's Locks Guarded by Chains 745 



Using Ice to Lower Heavy Stones 774 



A Hint for Draftsmen 793 



ELECTRICITY 



Band Conceits from an Electric Light Bulb 71 



Brightening the Baby's Path 92 



Saving Steps at Target Practice 95 



An Electric Flat Iron Float 95 



Electric Heater Resembles Desk Telephones 104 



Winter Uses for the Electric Fan 109 



Electric Toaster Eliminates Burnt Fingers 110 



Electric Candles on a Nine-Story Birthday Cake. . 169 



A Sleeping Nest with an Electric Elevator 185 



Signal Lights for Traveling Cranes 228 



Power from a Floating Water Power Plant 234 



Testing Shrapnel Shells in Electric Ovens 254 



Something Is Wrong with This Unemotional 



Phonograph Fire Alarm 337 



Page 



How to Photograph Electrical Sparks 348 



Trimming Veneered Edges by Electricity 348 



An Owl Darkens the Town 369 



Typewriting Eight Telegrams Over a Single Wire. 374 

 Can Battery Explosions on Battery Submarines Be 



Prevented? 394 



A Top That Never Stops Spinning 401 



What Makes an Electric Lamp-Bulb Glow? 401 



The Electric Dog and How He Obeys His Flash- 

 lamp Master 426 



Finding the Positive Wire 454 



How to Prolong the Life of Battery Cells 454 



Springless Electric Bell 454 



A Simple but Powerful Arc-Light 455 



Making a Master Vibrator for Automobiles 461 



Electric Door-Opener for a Garage 470 



A Metal-Vapor Light That Is White 529 



T elegraphing with the T elephone 563 



Detecting Flaws in Steel by X-Ray 577 



Storage Battery Hints 652 



An Electric Soldering Iron 626 



Construction of Unipolar Dynamos 624 



The Electromagnetic Hand for Armless Veterans. 657 



An Electrically-Lighted Clock 699 



A Socket Protecting Knot 73 I 



An Electric Fan Suspended by lis Own Wire 736 



Lamp Resistance for Charging Storage Fatteries 781 



Recharging Worn-out Dry Batteries 781 



Autorratic Dead-End Switch 785 



Making Coils of Resistance Wire for a Small Elec- 

 tric Stove 788 



How to Make an Electric Horn 788 



Repaiiing a Burnt-Out Fuse 788 



Changing a Telegraph Sounder Into a Relay 789 



Substituting a Flashlight for a Door Fell 789 



Teleohone Line Test Clips Easily Made 789 



A Current Reverser for Srrall Motors 789 



Making Over the Lighting S\ stem 795 



Healing Magic of the Electric Arc 818 



Illuminating a Highway with Pockets of Light. . 905 



Bird Protection for Electric Lines 907 



Making a Simple but Efficient Flasher 939 



For Those Midnight Serenaders 939 



A Musical Electric Door-Bell 940 



Connecting Dissimilar Telephone Lines 941 



Connecting Wires with Tinfoil 941 



An Efficient Spark-Plug Tester 941 



The "Ideal" Battery .■ • ^45 



The Construction of an Automatic Battery Circuit- 

 Breaker 947 



How to Make a Rural Mail Box Alarm 947 



Electrical Lighting Device for the Gas-Range. . . . 948 



An Electric Weather-Vane Indicator 948 



GEOLOGY 



The Devil's Post Pile I 78 



Natural Cannonballs I 78 



Natural Stadium Which Holds One Hundred and 



Thirty Thousand 248 



What Wind and Rain Can Do 530 



Fake Gypsum Claims 573 



Rock Folded Like Cardboard 814 



Strange Mineral Spring Deposit in a Nevada 



Desert 897 



A Strange Spongelike Rock 903 



Are Metals Alive? 912 



GAMES, PUZZLES. AND OUTDOOR 

 SPORTS 



Ice Dynamited So Yale Crew May Row 658 



Playing Golf on the Roof 669 



Ten-Net — -An Indoor-Outdoor Game 705 



Outdoors Yet Indoors '26 



HOME CRAFTSMAN 



An Extra Diainboard for the Kitchen Sink 



To Lengthen the Life of a Necktie 



Wood Box Arrangement Saves Many Steps from 



the Dining-Room 



Broom Closet Utilizing Waste Space 



A Cheap Septic Tank 



A Craftsman Desk Chair 



A Serviceable Hot Water Heater Which Can Be 



Made at Home 



How a Course Dinner Can Be Served Without a 



Maid 



Connecting Block for Bell Wires 



113 

 113 



113 

 114 



114 

 115 



118 



no 



