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Remarks on Mr Jacobs Obſervations. 255 the arms either downward or forward. Mr Jacob is indeed ſo far in the right in his aſfertion, as a difh of the wheel requires a2 taper of the arm, in order to gain thoſe advantages which are Ppropo- ſed by the diM.

But diſhed wheels may be uſed with cylindrical arms, and in this caſe the arms muſt neither be bent downwards

nor forwards; for, if they were, the

wheels would preſs violently inwards.

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