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COMPENDIUM INCLINATION MEASUREMENT
WYLER AG, WINTERTHUR / SWITZERLAND

6.4.3 FLATNESS MEASUREMENT / FURTHER PRINCIPLES FOR MEASURING INCLINATIONS

MEASURING DIRECTION
To ensure accurate measurements, it is important to:
• Always move the instrument toward the cable from left to right or from front to back
• Touch the instruments only by using the handle (temperature)
Reference
instruments

Measuring direction
transversal

Measuring direction
longitudinal

Measuring
instruments Toward cable
THE SUPPORTING POINTS OF A SURFACE PLATE ACCORDING TO BESSEL ( BESSEL POINTS)
Friedrich Wilhelm Bessel (1784 – 1846) was a German mathematician, astronomer, and systematizer of
the Bessel functions (which were discovered by Daniel Bernoulli). He was a contemporary of Carl Gauss,
also a mathematician and astronomer.
In simplified terms, it can be said that a measuring and control plate that is placed on three supports
bends the least when the supports are placed at 22% of the length or width.

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