Q: What Elmer A. Sperry invented?

1. Gyrocompass
2. Hydroplane
3. Magnetic compass
4. Hydraulic turbine

Q: What Thomas Davenport invented?

1. Chesterfield
2. Electric streetcar
3. Screw propellor
4. Sleeping (railway) car

Q: What George Westinghouse invented?

1. Refrigerator
2. Railway air brakes
3. Electric razor
4. Light bulb

Q: What J. B. Dunlop invented?

1. Pneumatic rubber tire
2. Automobile wheel rim
3. Model airplanes
4. Rubber boot

Q: What Galileo invented?

1. Thermometer
2. Microscope
3. Pendulum clock
4. Barometer

Q: What Sir Isaac Newton invented?

1. Microscope
2. Reflecting telescope
3. Chronometer
4. Spectacles

Q: What James Watt invented?

1. Rotary steam engine
2. Diving bell
3. Hot air balloon
4. Steam boat

Q: What Elisha Otis invented?

1. Elevator
2. Jet engine
3. Escalator
4. Turbine

Q: Benjamin Franklin was a prolific inventor. He invented the lightning rod, the Franklin stove, studied electricity, discovered the Gulf Stream, started the first library, and on and on. Among his many other inventions, what musical instrument did he invent?

1. Clarinet
2. Oboe
3. Banjo
4. Harmonium

Q: What George Pullman invented?

1. Airship
2. Air brakes
3. Sleeping (railway) car
4. Box car (railway)

Q: What Benjamin Franklin invented?

1. Radio
2. Hygrometer
3. Barometer
4. Bifocal spectacles

Q: What Henry Bessemer invented?

1. Steel rolling mill
2. Electroplating
3. Aluminum
4. Steel Converter