Cronbachâs alpha Cronbachâs alpha is most commonly used to measure internal consistency reliability, such as the reliability of a 10-item questionnaire. However, it can also be used to measure inter-rater reliability if the judges used an interval-or ratio-scale dependent variable.
1 1232: The Chinese who invented gunpowder (black powder) first used it in a weapon-gunpowder filled tubes aka rockets. 2  1364: First recorded use of a firearm-shooter lit wicks by hand that ingnited gunpowder that was loaded into the gun barrel. 3  1400s: Matchlock guns-first mechanically firing of guns.
1879 - Lee box magazine patented. 1892- Advent of automatic handguns. The first automatic pistol was created by Joseph Laumann in 1892. But the Borchardt pistol of 1893 was the first automatic with a separate magazine in the grip, and this remains the defining feature of the breed.More automatics came in rapid succession, including Browning, Luger, Mauser, and Colt models.879 - Lee box magazine patented. 1892- Advent of automatic handguns. The first automatic pistol was created by Joseph Laumann in 1892. But the Borchardt pistol of 1893 was the first automatic with a separate magazine in the grip, and this remains the defining feature of the breed.