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like this can be placed in any artist.
Perhaps I could make the examination, at least with the assistance of an intelligent engineer. I know by experience , that a knife-edge may be bent by the pressure of the screns, so much as materially to affect its rate. Several forms of pendulums were prepared by Mr. Baily
which are now in possession of the R. Astronomical Society: these might he examined.
When you are engaged in the experiment perhaps would not he difficult to try both the invariable and the convertible forms.
I am, my dear Sir Yours very truly
GB Airy
