10
INSTRUCTIONS FOR USE
Readings are usually taken with the right eye. Owing to differences in the keenness of
the sight of the eyes and because of personal preferences the use of the left eye is
sometimes easier. It is of prime importance that both eyes are kept open. The
supporting hand must not obstruct the vision of the other eye.
The instrument is held before the reading eye so that the scale can be read through
the optics, and the round side-window faces to the left. The instrument is aimed at the
object by raising or lowering it until the hairline is sighted against the point to be
measured. At the same time the position of the hair line against the scale gives the
reading. Owing to an optical illusion the hair line (crosshair) seems to continue
outside the frame and is thus easily observed against the terrain or the object.
The left-hand scale gives the slope angle in degrees from the horizontal plane at eye
level. The right-hand scale gives the height of the point of sight from the same
horizontal eye level, and it is expressed in per cent of the horizontal distance.
The following example illustrates the procedure:
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