Luxfer prism 74 Fresnel lens 74 Lamp and reflector a unit 75 Inverted arc-light 75 Sacramento perch totally reflected in aquarium 77 Diagram illustrating total reflection 78 Holophane globe, sections 79 Holophane globe, diffusing curves 80 Holophane globe, three varieties 80 Holophane globe, and Welsbach mantle 81 Wire shortened while original direction is resumed 81 Four mirrors reflect a ray in a line parallel to first path 82 Prisms for Zeiss binocular glasses 82 Sections for Zeiss binocular glasses 83 Tools for producing optical surfaces 84 Bi-focal lens for spectacles 85 Canadian box-stove 86 Canadian dumb-stove 86 Tubing for radiator 87 Gold’s electric heater 87 Stolp wired tube for automobiles 87 Corrugated boiler 88 Pipe allowing contraction or expansion 88 Carving chisels and gouges 90 Lathe cutters 90 Ratchet bit brace 90 Eskimo skin scraper 91 Double tool drill cutting boiler plate 91 Common drill compared with ring drill 92 Twist drill 93 How a tool cuts metal 94 Dacotah fire-drill 94 Lathe, with parts in detail 95 Compound slide rest 96 Blanchard lathe 96 Turret lathe, with side and top views 97 Ericsson’s Monitor 98 Iron planer 99 Iron shaper 99 Milling machine 100 Milling cutters with inserted teeth 100