49--A SERIES-WOUND DYNAMO 50--A SHUNT-WOUND DYNAMO 51--A COMPOUND-WOUND DYNAMO 52--ONE OF EDISON'S FIRST DYNAMOS 53--A DYNAMO MOUNTED ON THE TRUCK OF A RAILWAY CAR 54--FIRST ELECTRIC LOCOMOTIVE 55--FIRST EDISON ELECTRIC LOCOMOTIVE 56--EDISON'S FIRST PASSENGER LOCOMOTIVE 57--FIRST COMMERCIAL ELECTRIC RAILWAY 58--EDISON, AMERICA'S GREATEST INVENTOR, AT WORK IN HIS LABORATORY 59--EDISON'S FAMOUS HORSESHOE PAPER-FILAMENT LAMP OF 60--FIRST COMMERCIAL EDISON ELECTRIC-LIGHTING PLANT; INSTALLED ON THE STEAMSHIP "COLUMBIA" IN MAY, 61--A TELEGRAPH SOUNDER 62--MORSE'S FIRST TELEGRAPH INSTRUMENT 63--A TELEGRAPHIC CIRCUIT WITH RELAY AND SOUNDER 64--A SIMPLE TELEGRAPHIC CIRCUIT 65--FIRST TELEGRAPH INSTRUMENT USED FOR COMMERCIAL WORK 66--HOW TWO MESSAGES ARE SENT OVER ONE WIRE AT THE SAME TIME 67--HOW TWO MESSAGES ARE SENT OVER ONE WIRE AT THE SAME TIME. BRIDGE METHOD 68--FIRST BELL TELEPHONE RECEIVER AND TRANSMITTER 69--A TELEPHONE RECEIVER 70--TWO RECEIVERS USED AS A COMPLETE TELEPHONE 71--CARBON-DUST TRANSMITTER 72--THE PHONAUTOGRAPH, A FORERUNNER OF THE PHONOGRAPH 73--EDISON'S FIRST PHONOGRAPH AND A MODERN INSTRUMENT 74 to--THE FOUR-CYCLE GAS-ENGINE 78--TWO-CYCLE GAS-ENGINE. CRANK AND CONNECTING-ROD ARE ENCLOSED WITH THE PISTON 79--SELDEN "EXPLOSION BUGGY," FORERUNNER OF THE MODERN AUTOMOBILE 80--SOME EARLY LOCOMOTIVES 81--HOW A LOCOMOTIVE WORKS 82--HERO'S ENGINE 83--AN UNDERSHOT WATER-WHEEL WITH CURVED BLADES 84--AN OVERSHOT WATER-WHEEL 85--DE LAVAL STEAM-TURBINE 86--A MODERN STEAM-TURBINE WITH TOP CASING RAISED SHOWING BLADES 87--DIAGRAM OF TURBINE SHOWN IN FIG. 88--A STEAM-TURBINE THAT RUNS A DYNAMO GENERATING 14,000 ELECTRICAL HORSE-POWER 89--BRITISH ARMY AIR-SHIP "NULLI SECUNDUS" READY FOR FLIGHT 90--BASKET, MOTOR, AND PROPELLER OF THE BRITISH ARMY AIR-SHIP "NULLI SECUNDUS" 91--A ZEPPELIN AIR-SHIP 92--COUNT ZEPPELIN'S "DEUTSCHLAND," THE FIRST AIR-SHIP IN REGULAR PASSENGER SERVICE 93--THE BALDWIN AIR-SHIP USED IN THE UNITED STATES ARMY 94--IN FULL FLIGHT 95--WRIGHT AIR-SHIP IN FLIGHT 96--HOW THE WRIGHT AIR-SHIP IS KEPT AFLOAT 97--THE SEAT AND MOTOR OF THE WRIGHT AEROPLANE 98--THE BLÉRIOT MONOPLANE 99--THE "PLUNGER" 100--U. S. SUBMARINE "SHARK" READY FOR A DIVE 101--FIRST SUBMARINE CONSTRUCTED IN THE UNITED STATES. IT WENT TO THE BOTTOM WITH SEVEN MEN, WHO WERE DROWNED 102--HOW MEN IN A SUBMARINE SEE WHEN UNDER THE WATER 103--A TOP THAT SPINS ON A STRING 104--A CAR THAT RUNS ON ONE RAIL 105--MANUFACTURING DIAMONDS--FIRST OPERATION 106--MANUFACTURING DIAMONDS--SECOND OPERATION 107--MANUFACTURING DIAMONDS--THIRD OPERATION