Inventors and Scientific Discoveries

Zacharias Janssen is widely credited with the invention of the first compound microscope in the late 16th century.

Elisha G. Otis invented the safety elevator (lift) in 1852, which prevented the car from falling if the hoisting rope broke.

Charles H. Townes is credited with the development of the maser and subsequently the laser, for which he shared the Nobel Prize in Physics.

Correct answer is (3). 

Jean-Pierre Blanchard is credited with the first successful parachute jump from a balloon. While others like Da Vinci conceptualized it, Blanchard is the historical figure associated with its practical demonstration.

King Camp Gillette is famous for inventing the safety razor with disposable blades. This revolutionized personal grooming in the early 20th century.

Correct answer is (2). 

Walter Hunt invented the modern safety pin in 1849. He reportedly created it in a few hours to pay off a debt.

Sir Charles Parsons invented the steam turbine in 1884, which was subsequently used to power ships, most famously the Turbinia.