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Table of Contents

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PREFACE

INVENTIONS OF THE GREAT WAR

CHAPTER I The War in and Under the Ground

UNDERGROUND VILLAGES

HIDING RAILROADS IN DITCHES

PERISCOPES AND "SNIPERSCOPES"

STEEL BRIER PATCHES

MINES AND COUNTER-MINES

CHAPTER II Hand-Grenades and Trench Mortars

HAND-ARTILLERY

LONG-DISTANCE GRENADE-THROWING

STRIKING A LIGHT

MINIATURE ARTILLERY

GIANT PEA-SHOOTERS

THE STOKES MORTAR

CHAPTER III Guns that Fire Themselves

A DOCTOR'S TEN-BARRELED GUN

A GUN AS A GAS-ENGINE

GETTING RID OF HEAT

EFFECT OF OVERHEATING

USING THE BULLET TO FAN THE GUN

THE BROWNING MACHINE-GUN

THE MACHINE-GUN IN SERVICE

MACHINE-GUN FORTS

CHAPTER IV Guns and Super-Guns

SHOOTING AROUND THE EDGE OF THE EARTH

BEYOND THE EARTH'S ATMOSPHERE

WAYS OF INCREASING THE RANGE

A GUN WITH A RANGE OF A HUNDRED AND TWENTY MILES

THE THREE-SECOND LIFE OF A GUN

ELASTIC GUNS

HOW BIG GUNS ARE MADE

GUNS THAT PLAY HIDE-AND-SEEK

THE FAMOUS FORTY-TWO-CENTIMETER GUN

FIELD-GUNS

GUNS THAT FIRE GUNS

CHAPTER V The Battle of the Chemists

POURING GAS LIKE WATER

WAITING FOR THE WIND

WHEN THE WIND PLAYED A TRICK ON THE GERMANS

FREEING THE BRITISH TRENCHES OF RATS

GAS THAT MADE ONE WEEP

THE SNEEZING-SHELL

GAS-MASKS

GLASS THAT WILL NOT SHATTER

BATTLING WITH LIQUID FIRE

THE "FIRE BROOM"

CHAPTER VI Tanks

CHAPTER VII The War in the Air

EYES IN THE SKY

AIR SCOUTS AND THEIR DANGERS

THE SELF-HEALING GASOLENE-TANK

GIANTS OF THE SKY

HOW FAST IS A HUNDRED AND FIFTY MILES PER HOUR?

SHOOTING THROUGH THE PROPELLER

FIGHTING AMONG THE CLOUDS

THE FLYING TANK

AMERICA'S HELP

A BIRTHDAY PRESENT TO THE NATION

FLYING BOATS

THE AUTOMATIC SEAPLANE

AIRPLANES AFTER THE WAR

CHAPTER VIII Ships that Sail the Skies

THE WEIGHT OF HYDROGEN

ZEPPELIN'S FAILURES AND SUCCESSES

RIGID, SEMI-RIGID, AND FLEXIBLE BALLOONS

KEEPING ENGINES CLEAR OF THE INFLAMMABLE HYDROGEN

THE ZEPPELIN'S TINY ANTAGONISTS

SUSPENDING AN OBSERVER BELOW THE ZEPPELIN

A BALLOON GAS THAT WILL NOT BURN

AMERICAN CHEMISTS TO THE RESCUE

CHAPTER IX Getting the Range

SPREADING THE EYES FAR APART

GETTING THE OBSERVER OFF THE GROUND

MAKING MAPS WITH A CAMERA

CORRECTING THE AIM

MINIATURE BATTLE-FIELDS

SPOTTING BY SOUND

CHAPTER X Talking in the Sky

THE AUDION

TALKING FROM NEW YORK TO SAN FRANCISCO

SIMPLE EXPLANATION OF RADIOTELEGRAPHY

TALKING WITHOUT WIRES

RADIOTELEPHONES FOR AIRPLANES

TELEGRAPHING TWELVE HUNDRED WORDS PER MINUTE

DETECTING RADIO SPIES

THE WIRELESS COMPASS

PILOTING SHIPS INTO PORT

CHAPTER XI Warriors of the Paint-Brush

HIDING IN PLAIN SIGHT

MATCHING THE SKY

GETTING THE RANGE FOR THE TORPEDO

MAKING STRAIGHT LINES LOOK CROOKED

A JOKE ON THE PHOTOGRAPHER

SEEING BEYOND THE HORIZON

THE BRITISH MYSTERY SHIPS

CAMOUFLAGE ON LAND

A PAPER HORSE

FOOLING THE WATCHERS IN THE SKY

HIDING BIG GUNS

ROADS THAT LED NOWHERE

SHADOWLESS BUILDINGS

THE PHOTOGRAPHIC EYE

A CALL FOR THE PHYSICIST

MAKING SHIPS VISIBLE

CHAPTER XII Submarines

CONSTRUCTION OF THE U-BOATS

PUTTING HOLES IN A TANK TO KEEP IT FULL

ENGINES THAT BURN HEAVY OIL

FAT MEN NOT WANTED

THE BLINDNESS OF THE SUBMARINE

THE TORPEDO

GUNS ON SUBMARINES

A STEAM-DRIVEN SUBMARINE

A SUBMARINE THAT MOUNTS A TWELVE-INCH GUN

CHAPTER XIII Getting the Best of the U-Boat

SUBMARINE-CHASERS

A HINT FROM NATURE

A GAME OF HIDE-AND-SEEK

DEATH-DEALING "ASH CANS"

EYES IN THE SEA

TRAILING U-BOATS BY SOUND

CHAPTER XIV " Devil's Eggs "

THE MINE THAT DOES ITS OWN SOUNDING

PICKING INFERNAL MACHINES OUT OF THE SEA

FLOATING MINES

EGG-LAYING SUBMARINES

PARAVANES

PENNING IN THE U-BOATS

A WALL OF MINES

MINE RAILROADS ON SHIPS

CHAPTER XV Surface Boats

MOTOR TORPEDO-BOATS

THE SEA TANK

THE AWKWARD "EAGLES"

SEAPLANE TOWING-BARGES

THE "HUSH SHIPS"

MOTHER-BOATS FOR AIRPLANES

TORPEDO-PROOF MONSTERS

AN ELECTRICALLY STEERED MOTOR-BOAT

CHAPTER XVI Reclaiming the Victims of the Submarine

IN THE DEPTHS OF THE SEA

A SUBMARINE GRAVEYARD

DIFFERENT WAYS OF SALVING A WRECK

RAISING A SHIP ON AIR

SALVING THE U. S. SUBMARINE F-4

A HUMAN SODA-WATER BOTTLE

A SUBMARINE REST-CHAMBER

CUTTING METAL UNDER WATER WITH A TORCH

EXPLORING THE SEA BOTTOM IN A DIVER'S SLED

ARMORED DIVING-SUITS

THE SALVOR'S SUBMARINE

FIGHTING THE WAVES WITH AIR

INDEX

Inventions of the Great War

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