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Vector series laser rangefinder 7×42 binoculars can measure distance and angles and also features a 360° digital compass and class 1 eye safe filters German U.D.F. 7×50 blc U-boat binoculars (1939–1945) [82] Binoculars have a long history of military use.
Ritchie thought they could be improved upon, and by 1860 had received a U.S. patent for the first successful and practicable liquid-filled marine compass suitable for general use, [10] [11] a development that has been described as the first major advance in compass technology in several hundred years. [12]
The compass was invented in China during the Han dynasty between the 2nd century BC and 1st century AD where it was called the "south-governor" (sīnán 司南) or "South Pointing Fish" (指南魚). [3] The magnetic compass was not, at first, used for navigation, but for geomancy and fortune-telling by the Chinese.
Elmer Ambrose Sperry Sr. (October 12, 1860 – June 16, 1930) was an American inventor and entrepreneur, most famous for construction, two years after Hermann Anschütz-Kaempfe, of the gyrocompass and as founder of the Sperry Gyroscope Company. [3]
Ignazio Porro (25 November 1801 – 8 October 1875) was an Italian inventor of optical instruments. Porro's name is most closely associated with the prism system which he invented around 1850 and which is used in the construction of Porro prism binoculars. He also developed a strip camera in 1853 for mapping, which was one of the earliest such. [1]
David Pearsall Bushnell (1913–2005) was an American entrepreneur who founded the Bushnell optics company in 1948. Bushnell made precision binoculars affordable to middle-class Americans for the first time through a strategy of importing from manufacturers who provided optics to his patented specifications.
As William Ainsworth Inc., production of the Pocket Transit continued; the same basic design remains in production today, in numerous versions and configurations.. In 1970, the company introduced the Brunton Cadet, a simplified evolution of the Pocket Transit incorporating a compass and clinometer, intended for use in training students in the fields of geology, forestry, mining, and surveying. [9]
The system included a mechanism synchronizing the aiming direction of the receiving antenna with a compass-like indicator; it also included a means of rejecting false signals. Although the Telemobiloscope could not directly indicate range, a separate patent (DE 169154) was granted 2 April 1906, showing a method of using two vertical ...