HORSE-OPERATED CHAIN PUMP USED IN GREECE 32 MULTIPLE SPINDLE DRILL IN A MOTOR CAR FACTORY 33 BUCKET OF A GIANT DREDGE WITH ITS JAWS WIDE OPEN 64 GOLD DREDGE EATING ITS WAY THROUGH RIVER SANDS 65 SUCTION DREDGE EXCAVATING A CHANNEL AND BUILDING NEW LAND 65 AIR LOCK OF A PNEUMATIC CAISSON 96 SUBAQUEOUS TUNNEL SHOWING THE SHIELD IN THE BACKGROUND 97 WHARF PROTECTED BY A PNEUMATIC BREAKWATER 128 SUN-POWER PLANT IN EGYPT 129 CLOSE-UP OF ONE OF THE REFLECTORS OF A SUN-POWER PLANT 129 GIANT CAPRONI HYDROAEROPLANE 160 CONCRETE STEAMSHIP “FAITH” 161 “VIRGINIAN,” THE LARGEST LOCOMOTIVE IN THE WORLD 161 LOOM PROVIDED WITH A JACQUARD ATTACHMENT 224 BATTERY OF MULE SPINNING FRAMES 225 JACQUARD ATTACHMENT FOR LOOM 225 DIGGING A TRENCH WITH A MACHINE OF THE CHAIN TYPE 256 MULTIPLE PLOWING ON A WESTERN WHEAT FIELD 257 SAWING LOGS OF PULPWOOD INTO 16-INCH LENGTHS 288 HEATER IN A PULP MILL WHERE THE WOOD PULP IS MIXED WITH CLAY 288 MODERN FOURDRINIER PAPER-MAKING MACHINES 289 MOLTEN METAL FROM A BLAST FURNACE 320 BESSEMER CONVERTER BLOWING AIR THROUGH A MASS OF MOLTEN IRON 320 STEEL BEAM PASSING THROUGH THE FINISHING ROLLS 321 COMPOSITOR AT WORK ON A LINOTYPE MACHINE 352 THE OPTOPHONE, WHICH ENABLES THE BLIND TO READ PRINT 353 BLIND MAN READING WITH HIS EARS 353 CHAPTER I TOOL-MAKING ANIMALS WHEN we review the marvelous achievements of modern civilization we are quite willing to agree with the ancient psalmist that man is “little lower than the angels.” But at the other end of the scale our complacency is liable to receive a rude shock; apparently the boundary between man and beast is not so very easy to draw.