Evangelista Torricelli,  Italian physicist and mathematician who invented the barometer.He did this in in 1643.

Penicillin, the first true antibiotic, was discovered in 1928 by Alexander Fleming, Professor of Bacteriology at St. Mary’s Hospital in London.

A crescograph is a device for measuring the growth in plants. It was invented in the early 20th century by Sir Jagadish Chandra Bose.