موسوعة العلمـاء و المخترعين .. المخترعون بالترتيب حسب اسم الشهرة .. الحرف ٢_د

Encyclopedia of Scientists and Inventors..the inventors in order according to their nickname..the letter 2_d

⏹ Deringer, Henry

American arms manufacturer (from the nineteenth century)
Famous for making small firearms
He invented a short-barreled pistol that could be carried in the pocket and named after him a Derringer pistol (with the third letter repeated) Derringer.

⏹ Desaglieh Theophile
Desaguliers, Theophile

French mechanical engineer (1683 - 1744)
He was interested in the manufacture of mechanical machines that generate movement and added a number of improvements to them.
Desaglieh invented the piston or the metal piece called the piston, which developed its role so that it moved as a result of the explosion of the mixture of gas and air, and the movement was transmitted by the process of piston to the axis of movement.

⏹ Diesel, Rudolf

German engineer and inventor (1858-1913)

Diesel invented the internal combustion engine that uses heavy petroleum fuel and registered it in his name in 1892. And the advanced type of this engine, which is now known as the diesel engine, is the result of the efforts of many engineers and technicians who followed the work of Diesel.
The first diesel engine in 1897.

⏹ Digges, Leonard Digges, Leonard

English mathematician (? - 1571)
He is credited with participating in the manufacture of the telescope - he invented the “theodolite” (the device used in observation in surveying operations), whose idea was spread by his son, also the mathematician and military man Thomas (? - 1595).
Twenty years after the date of the invention.

⏹ De Forest, Lee

American engineer and inventor (years 1873 - 1961)
De First can be called the father of radio. He studied at Yale and the Chicago Institute of Technology and worked for the Western Electric Company. But he established his own laboratories in California. He has many inventions in the field of wireless (radio) communications. He was the first to use alternating current generator and transmitter.
In the electric valves, enter the grid grid ·
De First invented an audio amplifier, as well as the quartet valve (electrodes). Since 1921, he focused his efforts on television, image and sound transmission, and his inventions in these applied fields are very numerous (see Baird).