- No.99: The Hourglass
- No.98: Telescope
- No.97: Educating a Mason
- No.96: Streamline
- No.95: Superconductors
- No.94: The Black Box
- No.93: Telephone Use
- No.92: Occam's Razor
- No.91: Liberty Ships
- No.90: Cantor
- No.89: Lighthouses
- No.88: A Concern about
Reality
- No.87: Roebling
- No.86: Oxygen
- No.85: Helicopter
- No.84: Sopwith
- No.83: Beach's Subway
- No.82: Roads, Canals, &
Railways
- No.81: Titanic and Great
Eastern
- No.80: Women
- No.79: A Car for Ann Boleyn
- No.78: The Bicycle
- No.77: Napoleon and Iron
- No.76: About Alchemists
- No. 75: Lighter than Air
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No.74: Germs
No.73: Evariste Galois
No.72: First Clocks
No.71: Guillotine
No.70: Famous and Unfamous
People
No.69: Steam Engines in
England
No.68: A Question of Size
No.67: XP-75
No.66: Long Flights
No.65: Summary
No.64: Diesel
No.63: Systems
No.62: Russian Air Records
No.61: Tall Buildings
No.60: Submarine
No.59: A Transatlantic Cable
No.58: Crossing the English
Channel
No.57: The Samurai Sword
No.56: Einstein
No.55: Names of Machines
No.54: Indian Telegraph
No.53: Alexandria
No.52: Man the Measure
No.51: Tunnels
No.50: The Paige Compositor
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