A crescograph is a device for measuring growth in plants. It was invented in the early 20th century by Sir Jagadish Chandra Bose
This African-American woman physical therapist worked with soldiers disabled in World War II. She invented a device that helped the disabled to eat by delivering food through a tube to a mouthpiece.
Which French scientist invented the first satisfactory revolving light for use in lighthouses, and has a type of theatre light named after him?
What device, invented by Peter Cooper Hewitt in 1902 and obsolete by 1975 with the introduction of devices such as the silicon diode and thyristor, converts alternating current to direct current by means of putting electricity through vapor?
