2.7 Tomlinson Surface meter | Explained

#Tomlinson_Surface_meter
Construction-
The diamond stylus on the surface finish recorder is held by spring pressure against the surface of a lapped steel cylinder.
The stylus is also attached to the body of the instrument by a leaf spring and its height is adjustable to enable the diamond to be positioned conveniently.
The lapped cylinder is supported on one side by the stylus and on the other side by two fixed rollers.
The stylus is restrained from all motions except the vertical one by the tensions in coil and leaf spring.
The tensile forces in these two springs also keep the lapped steel cylinder in position between the stylus and a pair of fixed rollers.
A light spring steel arm is attached to the horizontal lapped steel cylinder and it carries at its tip a diamond scriber which bears against a smoked glass.
Working-
Any vertical movement of the stylus caused by the surface irregularities causes the horizontal lapped steel cylinder to roll.
By its rolling, the light arm attached to its end provides a magnified movement on a smoked glass plate.
The smoked glass trace is then, further projected at x50 or x100 magnification for examination.
This instrument is comparatively cheap and gives reliable results.

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