The Crookes tube is a sealed glass tube that exhibits fluorescence in it after voltage is passed through the electrodes inside. It was invented in 1875 by Sir William Crookes.
Lee De Forest invented vacuum tubes.
1897.
in 1919..by John A.Fleming
The first barometer that was invented was the MERCURY barometer. a mercury barometer consists of a glass tube open at the bottom end and partially filled with mercury. (:
John Flamsteed invented the first test tube.
Lee De Forest invented the electron tube in 1906.
The cathode ray tube was invented in 1897 by Ferdinand Braun.
1946
The Crookes tube is a sealed glass tube that exhibits fluorescence in it after voltage is passed through the electrodes inside. It was invented in 1875 by Sir William Crookes.
In 1907 American inventor Lee De Forest invented the three-electrode vacuum tube
In 1907 American inventor Lee De Forest invented the three-electrode vacuum tube
Lee De Forest invented vacuum tubes.
alexander bios
1897.
In 1850 dr.Washington
Craid Burnham