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The surveyor adjusts the instrument's level by coarse adjustment of the tripod legs and fine adjustment using three precision levelling screws on the instrument to make the rotational plane horizontal. The surveyor does this with the use of a bull's eye level built into the instrument mount.
The Y level or wye level is the oldest and bulkiest of the older style optical instruments. A low-powered telescope is placed in a pair of clamp mounts, and the instrument then leveled using a spirit level, which is mounted parallel to the main telescope. The term dumpy level (also builder's level) endures despite the evolution in design. They ...
The plate level is then used, rotating it 90 degrees between readings to level the instrument more precisely. The Fell All-Way precision level, one of the first successful American made bull's eye levels for machine tool use, was invented by William B. Fell, Rockford, Illinois prior to World War II in 1939. [1]
Sokkia level. Sokkia Co., Ltd. was founded in 1920 as Sokkisha in Japan. It makes measurement instruments for the surveying, construction and industrial measurement industries. In 2008 Sokkia was acquired by Topcon, but still maintains a separate brand. [1]
TOPCON was established in September 1932 [4] based the merger of the surveying instruments division of K. Hattori & Co., Ltd. (now known as Seiko Holdinge Corporation) in order to manufacture the optical instruments for the Japanese Army.
The Fell All-Way precision level, one of the first successful American made bull's eye levels for machine tool use, was invented by William B. Fell of Rockford, Illinois in 1939. [2] The device was unique in that it could be placed on a machine bed and show tilt on the x-y axes simultaneously, eliminating the need to rotate the level 90 degrees.
Peco InspX is a global manufacturer of fill level monitoring, X-ray inspection and related industrial systems. The company is headquartered in Burlingame, CA. Peco InspX specializes in the area of precision instruments for industrial use in the food, beverage and pharmaceutical industries.
Leica Geosystems produced, in continuation of Wild Heerbrugg, the geodetic instruments and is the global market leader in this sector as part of the new parent company Hexagon AB. The brand name "Wild Heerbrugg" is still in use for stereo microscopes [5] and precision level measuring such as the WILD Heerbrugg N3 Level. [6]
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