Popular Science Monthly 



INDEX 



Volume 90 — January -June, 1917 



AERONAUTICS . Page 



Rutb Law Makes Record Flight ... 106 



Dangling 'Twixt Earth and Sky from • Zeppelin. . 185 



The^Jiglt Mail 369 



The Motor Goose 370 



A Bird-like Airplane 375 



Ruth Law's Triplane 378 



The Cavalry Horse of the Air 397 



Making the Airplane Tire a Hundred Per Cent 



Efficient 414 



Searchlights Watching for Airplanes 490 



Shooting at Bird-Men with the New French Guns 512 



Why ZepF>elins Are Frightful 518 



The Aerial Taxicab 542 



An Airplane Propeller Made of Lacquer 671 



How Aviators Land Safely at Night 680 



Torpedoing from an Airplane 690 



A Twelve-Cylinder Airplane Engine 696 



A Shock-Absorbing Airplane Wheel. 855 



Adding the Motorcycle to Airplane Equipment. . . 864 



AGRICULTURAL SCIENCE 



Tempering the Wind to the Farm with Tree*. ... 30 



Farming in Your Cellar 55 



How the Forest Service Gathers Pine Seeds 67 



Making the Automobile Do the Chores 119 



A Knitting Needle Used for Testing Milk 146 



Growing Chrysanthemums 169 



Shipping Day-Old Chicks Is Profitable at Both Ends 1 90 



A Spinal-Column Harness for the Workman ... 194 



Growing Potatoes on the Roots of a Tomato Plant 203 



Taking Care of Honey Bees During the Winter. . . 206 



Wall Street Goes a-Farming 233 



Comfortable Cork Brick Flooring for Cattle 255 



New Cream Separator Governor Is Based on Novel 



Principles 423 



Mothering Orphaned Animals with a Make- Believe 



Nipple 437 



Modern Conveniences on the Farm 444 



The Amount and Distribution of Water on a Farm 451 



Modern Squabhouse Construction 453 



A Bulletin Board for Making Sales of Farm Produce 463 



A Method of Keeping a Rabbit's Cage Clean .... 464 



Stimulating a Plant's "Digestion" by ELIectricity . . 510 



Making Hogs Grind Their Own Grain Food 511 



Quarteiing Potatoes for Seed with a New Double- 

 Blade Cutter 596 



Converting an Automobile into a Farm Workhorse 598 

 An ELasily Constructed Pan for Sterilizing Dairy 



Utensils 617 



A Combined Waterpot and Hoe 728 



Portable Saw and Pump Outfits 746 



Grow Potatoes in Window-Boxes 746 



Coaxing Birds to Your Garden 756 



Making a Small Colony Poultry House 776 



Planting Strawberries by Machine 870 



Plowing the Farm by Automobile 881 



Enveloping Trees in Freezers to Study Tempera- 

 ture Effects 882 



Entertaining the Crow 892 



Picking F^uit from Tall Trees While Standing on 



the Ground 897 



An Improvised Tree Sprayer and Fire Engine 



Combined 909 



Rain When the Farmer Wants It 913 



Killing the Insect Pests of Trees with Poisonous 



Gas 915 



ARCHITECTURE 



Curing an Auditorium of Echoes 24 1 



A German Village on American Soil 424 



A Million-Dollar Schoolhouse 496 



Page 



A Thousand-Dollar Playhouse 498 



Liberty's Torch 552 



A Hollow Waterproof Tile Building Block 679 



A World's Fair Skyscraper 716 



A "Crazy Patch" House 807 



Reducing Fire Hazards 868 



Protecting Canal Zone Buildings with an Oil 



Moat for Insects 882 



A Tree That Served as a Home and Is Now a Band- 

 stand 902 



A Five-room Bungalow 93 1 



ASTRONOMY 



The Most Wonderful World in the Universe 264 



Is Space Itself Luminous? 271 



Prospecting the Skies 903 



CHEMISTRY 



Chemistry — An Important Factor in Criminology 42 

 Making Imitation Leather from Paper Preparations 1 13 



A Mixture for Cleaning Paint 121 



Chemically Hardening and Dust-Proofing Floors . 302 



A Vest-Pocket Sterilizer 400 



Potash from Seaweed — An Industry in the Making 575 



How Paints Are Made 593 



Goggles to Be Used When Making Chemical Ejipe- 



riments 610 



Oxidizing Iron with Fumes from.Acids 612 



Try Artificial Milk 680 



Dried Vegetables 698 



Another Outcome of the Wai — The American 



Evaporated Vegetable 727 



Writing Paper Made from Spinach Stems 742 



Making Artificial Cream that Rivals the Original . . 749 



The Wonders of Coal Tar 874 



A Convenient Method of Handling Dangerous 



Acids 929 



Making a Paint That Will Stand Washing 930 



CIVIL ENGINEERING 



Laying Pipes in a New Zealand River 40 



Endangering Your Life for an Imaginary Line ... 99 



A Wooden Boulevard Over the Desert 1 16 



Suppose New York's Harbor Were Drained 164 



France Completes the World's Largest Tunnel. . . 197 



Protecting San Francisco's Beach 259 



Widening a River with a Steam Shovel 343 



How the Office Adding Machine Is Employed in 



Surveying 348 



The Spaulding Dam 507 



Traffic Highways Under the Hudson River 508 



A Grass Bridge. A Remarkable Feat in Civil 



Engineering 564 



How Baltimore Protects Newly Paved Streets and 



Saves Time and Trouble 596 



It's Sheer Weight That Keeps a Pier in Place 600 



Surveying Wagon 645 



As a Lineman He Has Climbed Elight Hundred 



Miles 665 



Hammering Road-Beds to Make Them Even. . . . 733 



Making Floods Work 738 



Measurements of the Valleys of the Deep 748 



One of the Longest Tunnels in the World Is Planned 



for New York 750 



ELECTRICITY 



Seeing the Sounds That You Sing 29 



An EJectric Light Attachment for Eye-Shades. ... 30 

 Finding the Keyhole at Night 60 



