Abstract

If one reflects on the great army of scientific men who are at present studying the subject of the motion of planes, at an angle, in fluids, it is very remarkable that the work of Avanzini on this subject should have escaped notice. All that appears to be known about this diligent experimentalist is in reference to what is known as “ Avanzini's law,” in relation to the position of the centre of pressure on a moving plate. This law is quoted by Professor Bryan and M. Alexandre See (to quote two only of the most eminent writers on the subject), but they omit to say from whence they get the formula. M. Alexandre See, in a private letter, has kindly informed me that “ je crois qu'on a appele ‘ Loid ‘ Avanzini ‘ une loi qu'il n'a jamais formulee lui mime., mais qu'il a etudiee.” Whatever Avanzini may have said on the subject is probably to be found in the Memorie della Academia di Padova, but the volume containing his memoir does not appear to be in England; in any case 1 have not been able to find it.

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