lightweight angle-measuring instrument to calculate heights
- Wheel size: 13cm diameter
simplicity and accuracy for measuring the angle of elevation required to find heights or depths of buildings, hills or valleys. Having found the angle of elevation, the actual height of the object viewed may be found by scale drawing or by application of simple trigonometry. This Clinometer, by its simplicity, brings such an exercise within the scope of the junior school and yet is sufficiently accurate for sixth-form work.
OPERATING INSTRUCTION
The Clinometer should be held like a target pistol with the arm outstretched (elbow straight – not bent), with the forefinger on the trigger. It should be pointed at the top of the object to be sighted and the trigger pressed, and held pressed, until the graduated disc becomes stationary. The trigger is then released and the Clinometer can then be brought down from the aim position and the angle of elevation can be read. Care should be taken not to touch the trigger again or the reading will be affected. The whole operation takes only a few seconds. The only possibility of inaccuracy is in the operator’s steadiness in ‘shooting’. For this reason, it is recommended that a check reading should be made. An inaccuracy of one or two degrees can make quite a difference to the final answer.