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Clinometer

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clinometer [klə′näm·əd·ər]
(engineering)
A hand-held surveying device for measuring vertical angles; consists of a sighting tube surmounted by a graduated vertical arc with an attached level bubble; used in meteorology to measure cloud height at night, in conjunction with a ceiling light, and in ordnance for boresighting. Also known as Abney level.
A device for measuring the amount of roll aboard ship.
clinometer
An instrument for measuring vertical angles.
Clinometer 

a very simple geodetic instrument that is used to measure the slope angles of a terrain. A typical clinometer (see Figure 1) consists of a circular metal casing (1) and a sighting tube (2) that is fastened to the casing. The casing contains a graduated disk (3) on a spindle; attached to the disk is a weight that hangs

Figure 1. A clinometer

plumb, keeping the disk in a constant position. Other forms of clinometers are also available. The precision with which slope angles are determined by means of a clinometer does not exceed 0°.2.
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The compass I always keep in my pocket has a little clinometer attached, and I use that to determine the angle to the target.
Shoot accurately in the mountains by Ulmer, Randy / Bowhunter
Finally, they used a tape measure to walk 100 feet away from a typical tree, then peered at its crown through a device called a clinometer to estimate the height of the stand.
Cruising a timber classroom by The Register-Guard (Eugene, OR)
Some students were unsure about how to measure angles in a practical context like this so I also had to show them how to operate a clinometer.
Trigonometry from a different angle by Cavanagh, Michael / Australian Mathematics Teacher
 
 
 
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