ToC
POPULAR MECHANICS
| Mirrors—help deaf children learn to talk | 79 |
| Money—air driers speed output of | 96 |
| Moving Pictures | |
| camera and projector take pictures on paper | 89 |
| of birds and insects teach flying secrets | 55 |
| waves made with boxes | 48 |
| Museum—Philadelphia art, millions spent on curves that fool the eye | 32 |
| Navy—U.S., breaking the world's big gun record | 66 |
| Occupations—the most dangerous jobs | 49 |
| Ocean—Monaco, home of its story | 97 |
| Oil—search for, leads to sea on California coast | 113 |
| Orchids—grown under glass rival tropic kin | 49 |
| Pansy—four-inch blossoms | 58 |
| Playground Apparatus—fire escape as child's slide | 25 |
| Police—models help teach street location | 39 |
| Radio—short waves cast shadows | 1 |
| Radio—Aerials—ball antenna kit | 124 |
| Radio—Applications—voice starts and stops train | 112 |
| Radio—Batteries | |
| five dollars builds A-battery and charger | 121 |
| homemade fuses on cable | 124 |
| snap terminals on leads | 130 |
| testing kink | 131 |
| Radio—B-Eliminator—resistance C-bias for B-eliminator | 133 |
| Radio—Condensers—fixed midget easy to wire | 133 |
| Radio—Installation—efficient radio ground | 134 |
| Radio—Pictorial | 125 |
| Radio—Receivers | |
| bunched leads for sharp tuning | 132 |
| controlling tone and volume | 133 |
| selectivity feature of aero-dyne six | 127 |
| superheterodyne kink | 132 |
| Radio—Repairs—trouble-shooting kinks | 134 |
| Radio—Tubes | |
| light-sensitive | 136 |
| new tube is self-neutralized | 135 |
| output impedance for power tube | 131 |
| power tubes used as detectors | 132 |
| Razor—safety, blade moves like mower's | 10 |
| Reindeer—herds of Alaska to supply future meat | 102 |
| Rubber | |
| longer life for, seen in new treatment | 78 |
| as upholstering substitute for springs | 114 |
| Saws—motor bone, saves work for butcher | 120 |
| Seasickness—gas latest cure | 4 |
| Sewage Gas—as fuel to drive electric generator | 94 |
| Shale—makes concrete light without strength loss | 114 |
| Sharks—ship hunts sea terrors to make shoes | 108 |
| Shaving Accessories—lather bulb replaces brush | 33 |
| Ships and Shipping | |
| running a seagoing hotel | 18 |
| speed boat to cross Atlantic in four days | 8 |
| when a ship is arrested | 65 |
| Siphon—employs bulb to start and stop | 71 |
| Skin—registers emotions | 79 |
| Skyscrapers—have they reached their limit? | 34 |
| Sled—with roller runners speeds over bare ground | 74 |
| Slippers—paper, given to hotel guests | 45 |
| Smokers' Accessories—pipe cleaning set in holder carried like pen | 113 |
| Smokestack | |
| kept dark to protect birds | 46 |
| outline hidden with steel framework | 57 |
| Snowflakes—icy jewels of winter storms | 116 |
| Statue—Lincoln shown as lawyer | 89 |
| Steel—better and cheaper, by new process | 103 |
| Sugar | |
| from wood | 99 |
| used as medicine in early ages | 88 |
| Swimming | |
| bathers' push wheel adds sport to | 88 |
| spinning wheel adds sport | 33 |
| Taxes—aerial maps cut city | 17 |
| Television—fashion designs by radio | 42 |
| Tires—faults revealed by superspeed photos | 81 |
| Tongs—to remove clinkers save coal and dirt | 14 |
| Toothbrush | |
| rotary, aids dental hygiene | 39 |
| with replaceable head, cleans between teeth | 100 |
| Towels—hotel, are popular souvenirs | 120 |
| Toys | |
| endless track for train, novel window display | 107 |
| miniature castle doll house | 17 |
| Traffic—street guide, at curve, saves extra police | 94 |
| Trousers—protected from storms by waterproof covers | 86 |
| Tunnel—ten-mile under-sea (Japan) | 16 |
| Typewriting—chart to teach, saves students' time | 112 |
| Umbrella—growing handles | 45 |
| Vacuum Cleaner—hand-size, simplifies housework | 99 |
| Voice—defects in speech recorded to aid speakers | 8 |
| Volcano—model is feature of exhibit | 25 |
| Washbasin—for industrial plant, pedal saves time and water | 57 |
| Washer—has even grip to defeat vibration | 53 |
| Wasps—raised to fight codling moth | 42 |
| Water Pipes—why hot freeze more readily than cold | 119 |
| Weather—insects are prophets | 107 |
| Weather Vane—grasshopper, honors business man | 64 |
| Whales—tagged to aid study of habits | 80 |
| Wood—walnut trees grafted for beautiful grain | 86 |
| Workers—produce more today despite shorter hours | 46 |
| Zoo | |
| animals' health guarded by special weather | 74 |
| sailors' pets form collection | 99 |
| sight-seeing bus for small boys | 80 |
AMATEUR MECHANICS | |
| Aquarium—top for | 153 |
| Automobiles | |
| eliminating alcohol odors | 152 |
| locking Ford windows | 151 |
| Automobiles—Driving—natural gas for starting | 142 |
| Automobiles—Repairs—lamp for locating short circuits | 141 |
| Baby Chair—non-tipping | 141 |
| Bicycle—with auto steering wheel | 156 |
| Clock—how to level | 156 |
| Clothes Hanger—moth-proof | 151 |
| Clothesline—detachable reel | 148 |
| Door—silencer for sick room | 151 |
| Kitchen—filing cabinet aid in | 152 |
| Latches—for outside cellar doors | 150 |
| Lath—spraying speeds work | 155 |
| Mirror—campers' shaving | 152 |
| Paste—to squeeze from rubes | 140 |
| Photography—loading box aids field work | 153 |
| Rat Trap—simple way of deodorising | 141 |
| Ship Models—"Flying Cloud" | 143 |
| Skating—skate-sailing is thrilling sport | 137 |
| Sled—barrel stave | 151 |
| Snowslides—prevented by wire loops | 155 |
| Soap Bubbles—blowing giant | 142 |
| Valve Springs—uses for old | 155 |
| Wool-how to shrink darning | 141 |
SHOP NOTES | |
| Aluminum | |
| etching on | 175 |
| how to mend with zinc | 174 |
| Automobiles | |
| double wheels conquer soft dirt | 158 |
| packing for Ford window glass | 163 |
| Automobiles—Repairs—restoring contact of third generator brush | 175 |
| Automobiles—Tires—vulcanizing inner tubes | 173 |
| Belting—softening hard leather | 176 |
| Coal—easily built portable bin | 175 |
| Commutator—tool for cleaning | 164 |
| Crankcases—machine for lapping | 162 |
| Crucible—improvised electric | 170 |
| Draftsmen | |
| accurate perpendiculars with a 2-foot rule | 169 |
| a timesaver for | 159 |
| reading glass for | 163 |
| Drawings—protected from being soiled | 161 |
| Drilling—vertical holes without drill press | 163 |
| Dumb-Waiter—how to build | 171 |
| Eave Trough—combination hanger | 164 |
| Fertilizer—continuous for the garden | 161 |
| Furnace—easy way to fill water pan | 163 |
| Garage—Equipment and Supplies small crane | 173 |
| Gaskets—renovating copper asbestos | 173 |
| Handle—to operate two cocks | 162 |
| Hay—baled, dolly for handling | 169 |
| Iron—drilling chilled cast | 169 |
| Lathe—fitting, to do job requiring larger swing | 175 |
| Paints—effective tool for stirring | 160 |
| Pipe | |
| unscrewing thin tubing | 174 |
| well, removing driven | 170 |
| Piston—ring compressor | 162 |
| Pliers—have stop for bending wire | 161 |
| Potato—better plants | 174 |
| Pump—old, making new | 165 |
| Sandpaper—using in plane | 161 |
| Saw Frame—farm, uses for | 160 |
| Saws and Sawing—case for the tool chest | 174 |
| Tank—hot-water, insulating | 157 |
| Vegetables—handy containers for store | 159 |
| Wire—coiled by aid of copper pipe | 172 |
