A Brush Shield Made of a Rubber Washer

Ornamental Fern Basket Made in Lattice Work.. 131

Perforating Paper Sheets with Sharpened Cog

Points

Finishing a Rough Stick to Imitate Burnt Bamboo

Novel Arrangement for an Iceman's Sign.

A Method of Loosening Tight Nuts or Bolts.

Masking Device for a View Finder on a Camera

Simple Design for Sheet Metal Working.

Making a Shirt-Waist Box with Inclosed Tray.

Chemical Action Apparently Changes Wine Into

Water.

Handy Portable Fence Built in Sections.

Paper Stencil for Painting a Bicycle Head

Blocking the Skeleton Key in an Ordinary Lock.

Temporary Repair on a Boat Engine Shaft..

Treating a Clothes-Line to Prevent Its Stretching

Child's Play Tent Made Out of Awning Covers.

An Efficient Substitute for an Auto Jack.

Making a Round Cement Cover for a Cistern.

The Economical Use of Gasoline in Autos

130

Put On These Sandals and Swim Like a Duck..

Bumping the Bumps for the Fun and the Exhilara-

tion It Gives

94

113

131

Open Canoe Cruising..

126

131

WAR MECHANICS

132

132

Changing Engines Like a Suit.

132

133

136

136

137

How the British "Tanks" Received Their Name.

Ornamental Identification Rings for Fighters.

Finding U-Boats in the Depths of the Sea.

The Cost of Enrolling a Soldier in the Army

Let the Torpedo Go Under the Ship.

Vermin-Proofing Soldiers' Undergarments

7

27

27

29

30

35

137

138

138

This "Trojan Horse" Is Patient in Training Boys.

Dogs Are Trained for Service on the Battlefront

Tommies Use Bottles for Windows.

37

37

39

138

Anti-Aircraft Range-Finder.

39

139

139

Teaching Artillerymen to Man Big Guns.

Blocking the Zeebrugge Harbor.

41

42

A Sammy Wears Nine Pairs of Shoes a Year.

Making Believe with Paint and Brush at the Front

Cooking Underground for Soldiers..

The Cargo-Carrying Tank

Smoke Cloud to Screen the Movements of Troops.

Soldiers Use "Duck Boards" to Avoid Mud Baths

Bullet-Proof Shield to Protect Riflemen in the Field

French Fort, Like Anthracite Mine, Has Artificial

Ventilation

Naming Trenches After Manhattan's Streets.

The Self-Sacrificing Engineers of the Army..

How We Look in Arabic

Here's the Near-Auto

Which Is Gertrude, Which Is Grace and Which Is

Genevieve?

Newspaper Used as Socks for Horses.

Spectacles That Furnish Their Own Light

How Children May Be Taught to Hold the Pen

Correctly

45

47

49

58

63

75

82

99

108

117

MISCELLANY

15

567

24

155

Chalk Holder for Wood Worker's Beam Compasses 157

A Light Two-Wheeled Luggage Carrier for the

Camper.

The Flashlight Makes It Easy to Dip Up Goldfish

Combined Watch and Cigar Čutter.

26

29

Convenient Cuff Links.

48

157

The Swinging Target Is Not Difficult to Hit

Emergency Repair on a Broken Oil Pipe

158

Miniature Warships Aid Liberty Loan.

49

158

Aiding the Liberty Bond Sale.

52-53

A Simple Wind-Proof Lamp Used by Lumbermen. 158

Centrifugal Whirler Offers a New Water Sport.

A Heat Test That Shows Quality of Wrought Iron 160

A Fence Stock Guard for an Automobile Road. 160

A Signal Light Connection for a Telephone Receiver 160

RADIO COMMUNICATION

159

Jewel Perfume Trickler in a Finger Ring.

Talking Gloves for the Deaf and Blind.

61

65

Live Fish Used to Advertise Fresh Fish Dinners

Side-Tracking a Flood by Means of a Gully.

Run It Along the Map and Then Read Off the

Inches on a Dial

75

81

83

Here's a Dizzy Pruning Job.

89

Taller Towers at Nauen Station Increase Sending

Range

Great Sums to Be Spent for Roads

89

149

Throw the Life Preserver Overboard and It In-

Wireless Work in Wartime.

94

97

Spectacles to Help You See Under Water

98

Spineless Cactus Leaves as Sign-Boards.

105

SHIPS AND SHIP BUILDING

Novel Traps for Exterminating the Rat.

Canvas Shield for the Iceman.

110-111

114

Building a Fence to Keep Out the Old Newspapers 115

How to Gather the Wipings of the Dripping

Varnish Brush.

117

POPULAR SCIENCE MONTHLY is issued monthly. Yearly subscription in the United States $1.50. Canada, $2.00
Foreign, $2.50. SINGLE COPY, 15 cents.

POPULAR SCIENCE MONTHLY may be had at all news stands in the United States and Canada; also from the Interna-
tional News Company, Breams Bldg., Chancery Lane, London, E. C., and at Brentano's, 37 Avenue de l'Opera. Paris.
Forms close the twentieth of the second month preceding date of publication. Advertising rates on application.

Entered as second class matter at the New York Post Office, under the act of Congress of March 3, 1879. Entered as

second class matter at Post Office Department, Canada.

The contents of this Magazine are copyrighted and must not be reprinted without permission. H. J. Fisher

President; R. C. Wilson, Vice-President; O. B. Capen, Secretary and Treasurer.

Popular Science Monthly

!

MAR 27 1319 93

P235

CONTENTS FOR AUGUST-Continued

Page

309

313

313

313

314

Repairing Leaks in Aluminum Ware with Rivets 308
Electrical Devices and How They Work.
How to Make a Ventilating Potato Bin..
How to Make a Simple Wardrobe for the Camp.
Using an Egg Beater to Mix Dry Color in Paint
How to Make a Thatched Emergency Lean-to.
Inexpensive Method of Charging Storage Batteries 317
Cleaning the Surfaces of Celluloid Articles.
Homemade Ambulance for the Automobile.
How to Tell if Copper Is Used in Canned Goods.. 318
Cleaning Dirt and Grease Marks from Tracings.. 318
Screening Gravel When Loading into Dump Wagons 318
New American Ball Game Using the Inflated Ball 319
Porch-Swing Support Made of Pipe and Fittings. 320
Repairing a Speedometer Shaft with a Nail..

RADIO COMMUNICATION

170-71

172-73

174-75

Wireless Work in Wartime. ......

176-77

178-79

RAILWAYS

180

317

318

320

315

Trinidad Chocolate.

Queer Head Coverings Worn in Malta and Korea 181

How the Gentle Art of Camouflaging Is Taught 182-83

Building Imitation Alps of Rocks and Concrete 262-63

PRACTICAL WORKERS' DEPARTMENT

Practical Camp Stove for the Tourist.

Solution for Re-inking Typewriter Ribbons.

Starting Induction Motors When Coils Fail

Injecting Water to Make Pumpkins Grow Fast..

Drying Potatoes Instead of Storing Them..

Old Buggy Wheels Used for Training Vines.

Underslung Rack for Hauling Green Corn Fodder 283

Removing Static Charges from a Moving Belt.. 283

Making Transparent Varnish of White Shellac.. 283

Mounting Seaweeds on Cardboard for a Collection 284

Novel Door Check That Holds the Door...

Dash Fastener for the Driving Reins...

Pointers on the Care of Tools to Prevent Rust

Applying a Coat of Ivory to Make It Look Like

Silver..

281

281

281

282

282

How a Big Tanker Was Salvaged

210

282

Electric Dubbing" Machine..

211

A Collapsible Boat for a Submarine's Use.

The Labor-Saving Sail-Raiser.

261

271

Compact Air Pump for Your Launch..

274

Submarine Decoy Made of an Old Cedar Log.

How to Pull Fence Posts by Horse Power Easily. 286

A Substitute for a Paint Striping Brush...

An Effective Ant Trap Made of Pie Tins.

Convenient Method of Keeping Brads and Screws 287

Saving Undersize Bushings and Liners by Plating 287

Silver Plating That Will Not Scale When Burnished 288

Compressed Air Manifold for Boiler Shops..

Simple Garbage Incinerator for Camp Use,

Simple Designs for Sheet Metal Working..

How to Make a Hand-Operated Crane for the Shop

Stanchion for Holding Hogs While Ringing...

An Ingenious Grinding Rig for Steel Knives.

A Coating for Drawings to Preserve the Lines.

Photographic Plates Used for Mounting Pictures 295

Automobile Engine for Driving Machinery.

New Type of Carpenter's Saw Horse..

WAR MECHANICS

286

287

287

Yearly subscription in the United States $1.50. Canada, $2.00

POPULAR SCIENCE MONTHLY may be had at all news stands in the United States and Canada; also from the Interna-

tional News Company, Breams Bldg., Chancery Lane, London, E. C., and at Brentano's, 37 Avenue de l'Opera. Faris.

Forms close the twentieth of the second month preceding date of publication. Advertising rates on application.

Entered as second class matter at the New York Post Office, under the act of Congress of March 3, 1879. Entered as

second class matter at Post Office Department, Canada.

The contents of this Magazine are copyrighted and must not be reprinted without permission.

President; R. C. Wilson, Vice-President; O. B. Capen, Secretary and Treasurer.

H. J. Fisher

POPULAR SCIENCE MONTHLY is issued monthly.

Foreign, $2.50. SINGLE COPY, 15 cents.

Yearly subscription in the United States $1.50. Canada, $2.00

POPULAR SCIENCE MONTHLY may be had at all news-stands in the United States and Canada; also from the Interna-

tional News Company, Breams Bldg., Chancery Lane, London, E. C., and at Brentano's, 37 Avenue de l'Opera, Paris.

Forms close the twentieth of the second month preceding date of publication. Advertising rates on application.

Entered as second class matter at the New York Post Office, under the act of Congress of March 3, 1879. Entered as

second class matter at Post Office Department. Canada.

The contents of this Magazine are copyrighted and must not be reprinted without permission.

President; R. C. Wilson, Vice-President; O. B. Capen, Secretary and Treasurer.

H. J. Fisher