Modern Antiques. 69 radius of the wheel, at which moment the advantage of the wheel to surmount the obstacle is a minimum or zero. The advantage of a wheel to overcome any obstacle of a ghen height rvhen the plane over which the wheel moves, and the line of draught, are both horizontal, will be as Ihe tangenf of the angleformed by a verLicad drawnfrom the centre of ihe wheel downwards, and UBother Line drawn from the smnc point, to the top of the obstctcle, divided @I the radius of ihc &eel.

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... ______- lUotlei-72 fl)atiqlLes. _DJ rlie EEisron. IJNDF:~ this titIe we propose to furnish, occasionally, some palpable evidences of the forestalling disposition of our remote aucestors, Who have, in numerous instances, deprived us, and our cotempomries, of the honour of being the Lrue cl& original i?zueMors, or discoverers, Of various improvements in mechanics, and other useful arts; and who even peep frotn tlici~ graves to dispute the rights of those who have issued to tile world their new born projects in the form of letters patent, under the sign manual of presidents and kings. This is certainly a grievous case, and, unfortunateIy, not less common than grievous, and one which scarcely admitti of a remedy; a deaf ear is turned to our remonstrances, and there seems to be nothing left to Us but to appeal to CL impartial posterity." We have selected as the first evidence of the justice of our complaints,