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The circular bubble is used to roughly level the instrument in two dimensions. 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 ...
If the bubble housing has graduated divisions, then the sensitivity is the angle or gradient change that moves the bubble by one of these divisions. 2 mm (0.079 in) is the usual spacing for graduations; on a surveyor's level, the bubble will move 2 mm (0.079 in) when the vial is tilted about 0.005 degree.
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 ...
IEEE 802.15.4-2006 (low-level protocol definitions corresponding to the OSI model physical and link layers. Zigbee, 6LoWPAN, etc. build upward in the protocol stack and correspond to the network and transport layers.) Thread (network protocol) UWB; Wireless USB; Zigbee; ANT+; MiraOS a wireless mesh network from LumenRadio
Some of these many camera angles are the high-angle shot, low-angle shot, bird's-eye view, and worm's-eye view. A viewpoint is the apparent distance and angle from which the camera views and records the subject. [2] They also include the eye-level shot, over-the-shoulder shot, and point-of-view shot. A high-angle (HA) shot is a shot in which ...
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