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1 The Short Mayo Composite Aircraft 2 The Flying Triangle 3 The Westland Hill Pterodactyl 4 Sealed Flying Suit 5 Detecting Unsen Enemies 6 The Queen Mary at Southampton 7 The Gyro Stabiliser 8 The Bathysphere 9 All Electric Signal Box 10 Desert Motor Service 11 The Dynasphere 12 Modern Fire Escape 13 Gigantic Steam Roller 14 The Gyrotiller 15 Giant Electric Shovel 16 The World's Longest Bridge 17 America's Largest Concrete Arch 18 The Boulder Dam 19 Monster Canal Lift 20 A 500,000 Volt Flash 21 The Ignition Tube 22 High Power Grid Glow Tube 23 Million Volt X Ray Tube 24 High Voltage Test House 25 Gigantic Electric Lamp | 26 Cleaning Air by Electricity 27 Magnet That Lifts 46 Tons 28 Huge Electro Magnet 29 The Stroboglow 30 Welding At 7,000 Degrees Fahrenheit 31 Benzol Recovery Plant 32 Huge Triple Expansion Pumping Engine 33 6,000 Ton Forging Press 34 Huge Vertical Boring Mill 35 Pair of Giant Motors 36 200 Inch Mirror 37 Greenwich's Largest Telescope 38 Giant Plate Glass Polishing Machine 39 30 Ton Treasury Door 40 Modern Cinema Operating Box 41 Automatic Telephone Exchange 42 The Speaking Clock 43 Television Studio 44 Micro Ray Wireless Station 45 Super Calculating Machine 46 Weighing the Earth 47 Eye Prints 48 Slot Machine which Plays Bridge |