o, How to Make 225
Portieres, Japanese, How to Make 265
Postcar Holder, How to Make 363
Postcard Projector, Electric 195
Postcard Rack 25
Postcards, Photograph 453
Postcards, Unreadable, Key Card for Writing 35
Pot Cover, Closet 16
Pot Covers, Homemade 297
Pottery Kiln, Homemade 62
Poultry, Feed Box for 292
Poultry Feeder, Alarm Clock 79
Powder, to Explode with Electricity 53
Propelling Vehicle, How to Make 402
Pulley, Grooved, Made from Sheet Tin 412
Pump, Rotary, How to Make 81
Punch. Piercing, for Brass 19
Punching Bag Platform, Adjustable 267
Punt, Homemade 123
Purse, Coin, How to Make 354
Putty, Blacking 376
Putty for Iron Castings 269
Putty Grinder 191
Putty, Painting over 136
Putty, To Preserve 121
Puzzle, Checker Board 189, 233
Puzzle, Dovetail Joint 236
Puzzle, Photographic Jig Saw 361
Puzzle, Wire 378
Pyro-Carving, Library Set in 407

Q
Quartz Electrodes Used in Receiving Wireless Messages 170
Querl, Versatile 28
Quilting Frames, Folding 258

R
Rabbit Trap, Homemade 233
Rabbit Trap, Self Setting, How to Make 158
Rabbits, Trap for 395
Rack, Bent Iron Pipe 305
Rack, Clothes 14
Rack, Cup and Saucer 105
Rack for Displaying Coins 220
Rack, Postcard 25
Rack, Shoe 146
Radium Affects Glass 116
Rain Gauge, How to Make 64
Rat Exterminator, Electric 358
Rat Traps 290, 395
Rats and Mice, Killing 293
Rats, Keeping from a Chicken Coop 352
Ray Filter, Substitute for 120
Reel, Kite 156
Relay Made from an Electric Bell 94
Rheostat, Battery 80, 445
Rheostat, Lead Pencil, How to Make 145
Rheostat, Water 78
Rheostat, Water, How to Make 43
Ring, Finger, How to Make 39
Ring, Tight Fitting, Removing from Finger 361
Roller Coaster Illusion 293
Roller Skates, Homemade 386
Rope Grills, How to Make 277
Rubber Bands in Kite Balancing Strings 270
Rubber Stamps, How to Make 393
Rubber Tip for Chair Legs 229
Rule and Hammer, Experiment with 106
Ruler, Fountain Pen Used as 319

S
Sack Trick 251
Sail, To Attach to a Bicycle 425
Sailomobile, How to Make 326, 415
Sails, Boat, Revolving a Wheel with 152
Sails for Skaters 381
Salad Dressing, Aid in Mixing 16
Sandpaper, To Keep from Slipping 376
Saw, Bracket, How to Make 42
Saw, Homemade Scroll 11
Sawing Sheet Metal 389
Scissors, Removing from a Card 175
Scissors, Sharpening 419
Sconce, How to Make