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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 liquid compass is a design in which the magnetized needle or card is damped by fluid to protect against excessive swing or wobble, improving readability while reducing wear. A rudimentary working model of a liquid compass was introduced by Sir Edmond Halley at a meeting of the Royal Society in 1690. [88]
Cammenga lensatic compass The M-1950 U.S. military lensatic field compass with self-luminous lighting (designated the Model 3H by Cammenga) is fitted with self-luminous tritium vial lighting. Under U.S. military specification (MIL-SPEC) performance criteria, ten pre-production samples of the M-1950 are required to meet a battery of performance ...
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]
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Benjamin Tyler Henry patents the Henry rifle, a 16-shot .44 caliber rimfire breech-loading lever action tubular magazine model, predecessor of the Winchester. [ 12 ] Edward Samuel Ritchie , considered to be the most innovative instrument maker in nineteenth-century America, receives a U.S. patent for the first successful and practicable liquid ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 15 February 2024. Finnish manufacturer of compasses, dive computers and sports watches Suunto Oy Suunto's headquarters and production facilities in Vantaa, Finland Company type Subsidiary Industry Measuring instruments Founded 1936 ; 89 years ago (1936) Founder Tuomas Vohlonen Headquarters Vantaa ...
Owing to its clamshell design—the first in a portable computer—some historians credit the original Compass as the first ever laptop. [5] This original model of Compass lacked an internal battery compartment, requiring AC power from the wall. [5] Grid sold the succeeding model, the Compass II, in 1984 with an optional external battery unit.