Q: What Elmer A. Sperry invented?

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

Q: What Thomas Davenport invented?

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

Q: What George Westinghouse invented?

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

Q: What J. B. Dunlop invented?

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

Q: What Galileo invented?

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

Q: What Sir Isaac Newton invented?

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

Q: What James Watt invented?

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

Q: What Elisha Otis invented?

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

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. Harmonium
2. Clarinet
3. Oboe
4. Banjo

Q: What George Pullman invented?

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

Q: What Benjamin Franklin invented?

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

Q: What Henry Bessemer invented?

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