INDEX TO VOLUME 88 



Page 



An Oil Trav Made VC'ithout Solder 294 



To Face Left-Hand Nuts 439 



A Spirit-Level for Use in Dark Places 439 



The Flap-lock Envelope 440 



Home-Made Motion Picture Camera 440 



An Electrically-Operated Screwdriver 441 



How to Make a Self-Honing Razor Strop 441 



A Simple Air Pump 442 



Barrel for Holding Sacks 443 



Gage for Duplicate Hole Drilling 443 



Sawing Difficult Angles on Small Stock 443 



An Emergency Pipe-Cutter 444 



Handling Small Brads 444 



A Lathe Polishing Kink 444 



A Simple Bit-Gage 444 



Tapping Blind Holes 444 



Using Ice in Masonry 444 



Whistle on Engine of Motor Boat 444 



How to Build an Aero Ice-Racer 445 



An Emergency Drill Press 449 



A Handy Chuck for a Small Lathe 449 



A Simple Gas-Pressure Regulator 449 



To Adjust a Light-Cord 450 



The Thermos Bottle as a Stove 450 



Utilizing Empty Cartridges 450 



Cutting Brass *462 



An Oil-Proof Cement 508 



Sandpapering Made Easy 568 



A Method of Packing Barrels 568 



Deep Center-Punching 586 



A Useful Gage for Motorists 597 



How Betsy Ross Made a Five-Pointed Star With 



One Cut 597 



Making and Using a Small Drill 598 



Straightening Kinlced Wire 598 



How to Construct a Simple Cyclecar Starter. . . . 399 



Removing Tires with a Clothes-Pin 599 



Bunsen Burner and Blow-Torch Combined 600 



Brass Tube Cleans File Teeth 600 



Cutting Glass Bottles and Tubes with Oil 600 



A Coarse File for Soft Metals 600 



A Trousers-Hanger 600 



A Piece of Furniture of Many Uses 601 



Washing Blueprints and Bromide Enlargements. . 601 



Save Fuel for Oil-Burners 602 



A Speedometer Light for Ford Cars 602 



Driving Piles into Quicksand 602 



Making a Kite-Camera 603 



Turning Out Large Sheave Wheels Without a Lathe 604 



A Two-Jaw Chuck 605 



How to Wind Springs Easily 605 



Using an Electric Iron as a Stove 606 



How to Make a Leveling-Board 606 



A Handy Drawer-Catch 606 



A Paint Brush Hook 606 



To Bore Endwise in Wood 606 



Filtering Mercury 607 



A Simple Bit Gage 607 



Blacking Box Inside Brush 607 



Razor Blade Floor-Scraper 607 



A Novel Polishing Pad 607 



A Handy Drawing Table 608 



Acid Engraving on Steel in Your Own Hand- 

 writing 608 



Lighting Your Pipe in the Wind 608 



Attaching an Index Plate 609 



A Candle Motor 609 



An Emergency Vise Repair 609 



A Trick in Sawing 609 



An Electric Alarm Operated by a Clock 610 



Protecting Labels on Bottles 610 



Workbench Made from Old Piano 610 



A Library Paste Which Does Not Dry Up 610 



Handling Small Bolts Easily 610 



Catching Rats Wholesale 611 



A News Stand and Blueprint Washer Combined 611 



Laying Out Angles with a Two-Foot Rule 612 



A Simple Way of Making Facsimile Rubber 



Stamps 612 



Making a Bench Shear 753 



A Drill Made from a Needle 753 



Making a Handy Power-Bench 760 



Construction of a Revolving Drawing-Board 761 



The Construction and Use of a Safe Driving-Box 



Lifter 761 



Making Dies of Difficult Outline 762 



A Set of Jaws for Counter-Boring and Facing . . . 762 



Uncouoling Pipes 764 



Rounding Washers in a Speed Lathe 768 



Making Shrinkers 769 



Page 



An Easy Way to Punch Holes in Clock-Spring Steel 770 



An Improvised Pipe- Wrench 770 



Improving a Drawing-Ink Bottle 770 



A Bow-Drill for the Work Shop 771 



Non-Upsetting Holder for Drawing Inks 772 



Inside Counter-Boring in a Miller 773 



How to Improve a Pocket Spectroscope 773 



A Lathe Polishing Kink 774 



Tapping Blind Holes 774 



How to Cut Metal and Not Cut Yourself 774 



Handling Small Brads 774 



Whistle on Engine of Motor-Boat 774 



An Emergency Pipe-Cutter 774 



An Automatic Pressure-Gage Alarm 780 



How to Make an Electric Horn 788 



Soldering German Silver 792 



Non-Irritating Skin Cleanser 794 



Detachable Blades for Hatchets 813 



Measuring Cloth in the Roll 827 



Paraffin Protects the Labels of Chemical Bottles. . 878 



Adjustable Light-Holders for Factory Illumination 880 



Oiling the Vs on a Lathe 880 



Slow-Setting Plaster of Paris 887 



A Long-Handled Screwdriver 910 



Driving Screws in Inaccessible Places 918 



A Home-Made Ice-Mold 918 



How to Etch a Water-Set 918 



Making an Electric Lantern from a Flashlight ... 918 



Drilling Holes in Sheet Metal 919 



Grinding Out Dies 919 



A Home-Made Scalpel for Trappers 919 



How to Make a Reamer 919 



A Hose Connection Guaranteed Water-Tight .... 920 



How to Mend a Broken Casting 920 



Silver-Plating Glass 920 



How to Protect the Surface of a Laboratory Table 924 



A Mission Stain 924 



A Cheap Beam-Compass 925 



Gaging the Stack Draft 925 



A Safe Way of Bending Pipes 925 



How to Make a Polariscope to be Used as a Micro- 

 scope 926 



To Stop a Lathe Quickly 926 



Cutting Tile at Any Angle 927 



A Substitute for a Soldering Iron 927 



Taking the Squeak Out of a Sign 927 



Handling Fine Screws 928 



A Home-Made Thumb-Screw 928 



How to Make a Barometer 928 



Making a Long Distance Shot with a Shotgun . . . 928 



Oiling Hammer Handle 928 



RADIO COMMUNICATION 



Impedance of Oscillation Circuits in Wireless 



Telegraphy 1 43 



Recent Radio Inventions 146 



A Multiple Point Switch 149 



Radio Stations in Alaska I 50 



Radio Club News 1 54 



What Radio Readers Want to Know 155 



A New Aerial Supporter 157 



A Simple Changt-Over Switch 157 



A Condenser's Power 157 



Aeroplanes, Wireless and the War 295 



Duplex Wireless Telegraphy 297 



Recent Radio Inventions 298 



Crystal Detec'tor Hints 301 



Antenna Circuits in Radio Telegraphy 302 



Edison's Railroad Wireless 305 



A Roof Insulator 305 



International Conference at Washington 305 



Radio Has Velocity of Light 305 



The Static Coupled Receiving Tuner 306 



A Mexican Radio Station 307 



Radio Club News 308 



A Variable Condenser 308 



What Radio Readers Want to Know 309 



Safeguarding Vessels by Radio 451 



The Earth's Conductivity 433 



The Obligation to Secrecy 454 



Photographic Records Still Impracticable 454 



The Wireless Idea Is More Than Seventy Years Old 455 



Recent Radio Inventions 456 



An Improved Crystal Detector Stand 460 



Loose-Coupler Switch Arrangement 460 



A Motor-Operated Aerial Switch 463 



Free and Forced Oscillations in Radio Telegraphy 464 



Making a Simple Alternating Current Rectifier. . . 468 



Radio's First Rescue 468 



