_Showing the complicated character of the motion (common to most earthquakes), and also the course of a point at the centre of disturbance._ Table of Temperatures 115 Mr. E. G. Acheson, One of the Pioneers in the Investigation of High Temperatures 125 The Furnace-Room, where Carborundum is Made 131 "_A great, dingy brick building, open at the sides like a shed._" Taking Off a Crust of the Furnace at Night 135 _The light is so intense that you cannot look at it without hurting the eyes._ The Interior of a Furnace as it Appears after the Carborundum has been Taken Out 143 Blowing Off 147 "_Not infrequently gas collects, forming a miniature mountain, with a crater at its summit, and blowing a magnificent fountain of flame, lava, and dense white vapour high into the air, and roaring all the while in a most terrifying manner._" Side View of the Solar Motor 155 Front View of the Los Angeles Solar Motor 159 The Brilliant Steam Boiler Glistens in the Centre 163 The Rear Machinery for Operating the Reflector 167 Trees Growing in Water at Professor Nobbe's Laboratory 187 Experimenting with Nitrogen in Professor Nobbe's Laboratory 191 Mr. Charles S. Bradley 198 Mr. D. R. Lovejoy 199 Eight-Inch 10,000-Volt Arcs Burning the Air for Fixing Nitrogen 200 Machine for Burning the Air with Electric Arcs so as to Produce Nitrates 201 Marconi. The Sending of an Epoch-Making Message 206 _January 18, 1903, marks the beginning of a new era in telegraphic communication. On that day there was sent by Marconi himself from the wireless station at South Wellfleet, Cape Cod, Mass., to the station at Poldhu, Cornwall, England, a distance of 3,000 miles, the message--destined soon to be historic--from the President of the United States to the King of England._ Preparing to Fly the Kite which Supported the Receiving Wire 213 _Marconi on the extreme left._ Mr. Marconi and his Assistants in Newfoundland: Mr. Kemp on the Left, Mr. Paget on the Right 217 _They are sitting on a balloon basket, with one of the Baden-Powell kites in the background._ Marconi Transatlantic Station at Wellfleet, Cape Cod, Mass. 229 At Poole, England 231 Nearer View, South Foreland Station 235