A sextant, possibly.
A protractor.
Means a device which measures the angle of the boom relative to horizontal. Enable to determine measurements to a precision degree.
The device that astronomers use to find the angle between the horizon and stars in the sky is called a sextant.
boom stop
clinometer is the device which measures angle w.r.t to gravity
Such a device is known as a protractor.
A sinometer, or inclinometer, is a device used to measure angles of slope or tilt. To use it, place the sinometer on the surface you want to measure and adjust the device until it indicates the desired angle. You can then take a reading of the angle displayed on the sinometer.
Conduction angle refers to the portion of the cycle in which a device, such as a semiconductor switch or diode, conducts current. It is typically expressed as a percentage of the total cycle time. For example, a conduction angle of 60% means the device conducts for 60% of the cycle time. This parameter is important in power electronics applications to control the amount of power delivered to a load.
consider a right angle triangle ABC with AB is the base BC is the height , assume that BC is the height of the hillfind the length ABfind the angle BACuse the above equationBC= (tan BAC) * ABso BC is the height of the hill
stokes basket stretcher
A protractor is a device for measuring the angle between two intersecting lines.http://en.wikipedia.org/wiki/ProtractorIt is a half circle and (most) have a pointer in the middle to help you see the angle you are going to use .