Pressed seamless pitcher 185 Barrel of pressed steel 185 Range front of pressed steel 186 Pressed paint tube and cover 186 Norwegian cooker 189 Aladdin oven 190 Mayer’s floating magnets 193 Alum crystal, broken and restored 194 Marble before and after deformation by pressure 195 PROFESSOR ERNEST RUTHERFORD _facing_ 202 PROFESSOR A. A. MICHELSON _facing_ 214 Michelson interferometer 215 Light-wave distorted by heated air 216 Ancient Egyptian balance 219 Rueprecht balance 220 Earnshaw compensated balance wheel 223 Riefler clock 224 Photometer 227 Compass needle deflected by electric wire 230 Compass needle deflected by electric coil 231 Maxwell galvanometer 231 Weston voltmeter 232 Micrometer caliper measuring 1/1000 inch 236 Plug and ring for standard measurements 237 Two lenses as pressed together by Newton 237 Newton’s rings 238 Flat jig or guide 239 Deciduous cypress 247 Deciduous cypress, hypothetical diagram 248 Section of pipe or moor grass; of bulrush 251 Human hip joint 252 Valves of veins 252 Built-up gun 253 Achromatic prisms and lens 255 Three levers 256 Arm holding ball 256 Beaver teeth 258 Narwhal with twisted tusk 259 Lower part of warrior ants’ nest, showing dome 260 Wasp using pebble as hammer 260 Cuban firefly 263 DR.