Milling cutters executing curves 101 Emery wheels 102 Carborundum wheel edges 102 Rolls to reduce steel in thickness 104 Gourd-shaded vessel, Arkansas 108 Gourd and derived pottery forms 109 Pomo basket 109 Bilhoola basket 110 Bilhoola basket, a square inch of 111 A free-hand scroll: same as woven 111 Yokut basket bowl 112 Sampler on cardboard 115 Bark vessel and derived form in clay 115 Vase from tumulus, St. George, Utah 116 Wooden tray. Clay derivative 116 Shell vessel. Earthen derivative 116 Electric lamps in candle shapes 117 Notre Dame de Bonsecours, Montreal 118 NEW AMSTERDAM THEATER, NEW YORK _facing_ 118 Cinders large and small on hearth 120 Cube subdivided into 8 cubes 121 Cube built of 27 cubes 122 Two rubber strips, varying as one and three in dimensions, compared in sag 127 Air bubbles rising in oil 128 Dvorak sound-mill 132 Beam of light deflects dust 133 DR. CARL FREIHERR AUER VON WELSBACH _facing_ 156 Boivin burner for alcohol 157 Alcohol lamp with ventilating hood 158 Welsbach mantle 159 Tantalum lamp 160 Tungsten lamp of Dr Kuzel 160 Hewitt mercury-vapor lamp 161 SECTIONS PEARLITE AND STEEL _facing_ 164 CLEANING CARS BY THE “VACUUM” METHOD _facing_ 164 Open hearth furnace 165 PROFESSOR ERNST ABBE _facing_ 182 Bliss forming die 184 Bliss process of shell making 184 Mandolin pressed in aluminium 185