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Les langues disponibles
Reading the graduated scales
First read the hub scale and note the full 1 degree graduation being beyond the index. Then read
the micrometer value. Depending on the sector of the main scale being used proceed as follows:
In the positive sector simply add the micrometer value (min. arc.) to the value
of the main scale.
In the negative sector read the micrometer, calculate the number of min. of arc.
missing up to 60 min. of arc., add the calculated figure to the reading of the main
scale.
Applications
To measure an inclination:
Place the Clinometer properly on the object. Disengage the gear drive and rotate the hub until
the vial is approximately horizontal. Carefully re-engage the gear drive. Rotate the micrometer
until the vial is centred. Assure that the last correction is made by turning the micrometer in the
direction of raising scale. Read the inclination from main scale and micrometer.
To inspect an angle:
The Clinometer may be set to the required angle before placing the same on the object.
Provided the tolerance required is close, use the graduations of the vial to read the deviation
present.
To adjust an object to a predetermined inclination:
Set the Clinometer to the required angle. After placing the Clinometer on the object, adjust the
same until the bubble of the vial is centred.
Precautions:
The Clinometer actually measures inclinations in respect of the physically defined point
"centre of gravity of the Earth". Be aware that the alignment of the instrument on the measuring
object is important as the Clinometer will not naturally indicate the inclination of an object, but will
indicate the inclination of a line parallel to the axis of the Clinometer which may represent a
compound angle.
This means that it is of utmost importance to set the instrument well aligned on an inclined
surface in order to prevent measuring errors.
Measurements conducted at temperatures considerably different from standard metrology
temperature may be affected by thermal expansion of the materials used in the instrument.
To eliminate errors in this case, two readings, one in the falling direction and one in the raising
direction should be taken. Using the average of the two readings will offset the error due to
different thermal expansion of housing and worm shaft.
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