spirit level

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spirit level

a device for setting horizontal surfaces, consisting of an accurate block of material in which a sealed slightly curved tube partially filled with liquid is set so that the air bubble rests between two marks on the tube when the block is horizontal
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Spirit level

A leveling instrument used for testing the horizontal or vertical position of any structural member.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

spirit level

[′spir·ət ‚lev·əl]
(civil engineering)
level
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

spirit level

A closed glass tube of circular cross section, usually set in a device or instrument; nearly filled with liquid, so that a bubble is formed, the centering of which is used to determine true horizontal or vertical directions; a level.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Caption: Incorporating a bubble level into your sighting system will prevent you from canting your bow; all that needs to be vertical are your sight pins (or sight bar if you're using a slider).
How to Use Your Sight's Bubble Level
The bubble level also is 40 percent larger than others.
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It holds a DSLR with a big lens and includes a ball head with a quick-release plate and four bubble levels.
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It has an internal bubble level and Springfield Optics reticle for hands-free rangefinding out to 700 yards.
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With an ETX sitting on a flat, horizontal surface, level the tube by using a bubble level as a gauge.
Tips for happy slewing: just because you have a "Go To" telescope doesn't mean it'll always go where you want it to. Follow these suggestions to ensure trouble-free slewing to the sky's many wonders
All of the scopes are waterproof, fogproof, have multicoated lenses and are guaranteed ".50-caliber Shockproof." All are backed by a lifetime warranty, and all have an extremely unusual feature that I really admire: an internal bubble level at the bottom of the field of view that tells you whether you've mounted the scope 100 percent straight and, more important for long-range shooting, tells you if you're canting the rifle.
Springfield Scopes
* Tilt sensor: This device is an electronic version of a carpenter's bubble level, a horizontal tube with a bubble of air inside marked with a center line.
Bring on the 'bots
They include an "Assessment for Disabled Access Form," available through your state's ADA compliance office (or call ADA Technical Assistance at [800] USA-ABLE); a tape measure (we find that an 8-foot tape is the most useful); door pressure gauges; and either a bubble level specifically designed to measure ADA compliant slopes or an angle finder.
Disabled access survey tools
Your post must be perfectly vertical, and you can check this with a carpenter's bubble level.
Making the summer sundial
Both units feature six-digit LCD displays and out-of-range indicators, data-logging output, spindle control, speed control with eight rpm settings, bubble level and height adjustment.
New rheometers & test instruments emerge at recent shows
It comes with a bubble level and a pushbutton three-position light.
This sight's a Shocker[TM]

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