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2. Spirit level - Wikipedia

   en.wikipedia.org/wiki/Spirit_level

   Machinist's precision level. Early tubular spirit levels had very slightly curved glass vials with constant inner diameter at each viewing point. These vials are filled, incompletely, with a liquid — usually a colored spirit or alcohol — leaving a bubble in the tube. They have a slight upward curve, so that the bubble naturally rests in the ...

3. Bull's eye level - Wikipedia

   en.wikipedia.org/wiki/Bull's_eye_level

   A bull's eye level showing a level position A bull's eye level showing an unlevel position Machinist bulls-eye level. A bull's eye level is a type of spirit level that allows for the leveling of planes in two dimensions — both the 'pitch' and 'roll' in nautical terms. Standard tubular levels only consider one dimension.

4. Levelling - Wikipedia

   en.wikipedia.org/wiki/Levelling

   Precise level designs were often used for large leveling projects where utmost accuracy was required. They differ from other levels in having a very precise spirit level tube and a micrometer adjustment to raise or lower the line of sight so that the crosshair can be made to coincide with a line on the rod scale and no interpolation is required.

5. Level (optical instrument) - Wikipedia

   en.wikipedia.org/wiki/Level_(optical_instrument)

   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 ...

6. Spirit level (disambiguation) - Wikipedia

   en.wikipedia.org/wiki/Spirit_level_(disambiguation)

   A spirit level is an instrument used to determine whether a surface is exactly horizontal or vertical. Spirit level can also refer to: Engineer's spirit level, a specialised instrument used to level machinery; Spirit Level, Australian record label; The Spirit Level (poetry collection), 1996 poetry collection by Seamus Heaney

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8. Sine bar - Wikipedia

   en.wikipedia.org/wiki/Sine_bar

   Angles are measured using a sine bar with the help of gauge blocks and a dial gauge or a spirit level. The aim of a measurement is to measure the surface on which the dial gauge or spirit level is placed horizontally. For example, to measure the angle of a wedge, the wedge is placed on a horizontal table. The sine bar is placed over the ...

9. Pendulum clock - Wikipedia

   en.wikipedia.org/wiki/Pendulum_clock

   A spirit level or watch timing machine can achieve a higher accuracy than relying on the sound of the beat; precision regulators often have a built-in spirit level for the task. Older freestanding clocks often have feet with adjustable screws to level them, more recent ones have a leveling adjustment in the movement.