Which list puts these Slovak inventions in the correct order of time: Kempelen's Turk, the Petzval lens, Bahýľ's helicopter, the Banič parachute?
Answer and explanation
Correct answer: D. Turk, Petzval lens, helicopter, parachute
- Step 1: Kempelen's chess-playing Turk dates from 1770, the Petzval lens from 1840, Bahýľ's helicopter from the early 1900s and Banič's parachute from 1913. Step 2. Arranged from the earliest to the latest this gives the Turk, the Petzval lens, the helicopter and the parachute. Answer: Turk, Petzval lens, helicopter, parachute. Why not the others: The other lists put the helicopter before the lens, the parachute before the helicopter, or the lens before the Turk.
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