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Economy designs were supplied to the government, some with Norris's patent adjustment device. On some later low-angle planes with pin-and-hole iron adjustment, the 1913 patent number was used without the 13 suffix. Second patent; Under no. 199,198 of 22 June 1923 Thomas J. Norris patented modifications to his patent adjustment device.
A few years later, Lie-Nielsen moved into a 384-square-foot (35.7 m 2) workshop on the farm, and started production on his second plane, the skew-angle block plane. In 1988, as business grew, Lie-Nielsen bought an 8,000-square-foot (740 m 2 ) building in the town of Warren, Maine, which the company still occupies.
To find the angle of a rotation, once the axis of the rotation is known, select a vector v perpendicular to the axis. Then the angle of the rotation is the angle between v and Rv. A more direct method, however, is to simply calculate the trace: the sum of the diagonal elements of the rotation matrix.
T bevel with protractor and dividers In use. A sliding T bevel, also known as a bevel gauge or false square [1] is an adjustable gauge for setting and transferring angles. . Different from the square, which is fixed and can only set a 90° angle, the sliding T bevel can set any angle and transfer it on anoth
It is common practice to design the linkage system so that the movement of all of the bodies are constrained to lie on parallel planes, to form what is known as a planar linkage. It is also possible to construct the linkage system so that all of the bodies move on concentric spheres, forming a spherical linkage .
The complete unit is normally mounted on a tripod, and the telescope can freely rotate 360° in a horizontal plane.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.
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