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Journal of Scientific Instruments | Vol.18, Issue.8 | | Pages 167
An improved spherometer
A spherometer is described which is fitted with a device for indicating the point of contact. A plunger passes up the centre of the screw and, on contacting the surface to be measured, rises relatively to the screw. The upper part of the plunger carries a small glass disc which, when it rises, touches a convex glass surface fixed to the screw and so produces Newton's rings. The spherometer can be used for measuring finely ground or opaque surfaces.
Original Text (This is the original text for your reference.)
An improved spherometer
A spherometer is described which is fitted with a device for indicating the point of contact. A plunger passes up the centre of the screw and, on contacting the surface to be measured, rises relatively to the screw. The upper part of the plunger carries a small glass disc which, when it rises, touches a convex glass surface fixed to the screw and so produces Newton's rings. The spherometer can be used for measuring finely ground or opaque surfaces.
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