Essays, physiological and philosophical, on the distortion of the spine, the motive power of animals, the fallacy of the senses, and the properties of matter / By C.H. Wilkinson.

  • Wilkinson, C. H. (Charles Henry), 1763 or 1764-1850.
Date:
1798
Catalogue details

Licence: Public Domain Mark

Credit: Essays, physiological and philosophical, on the distortion of the spine, the motive power of animals, the fallacy of the senses, and the properties of matter / By C.H. Wilkinson. Source: Wellcome Collection.

    27/214 (page 9)
    (a). #iuft firft take place at the point a, (which in a fufible body is precifely that point of expanfion, at which it would become fluid by heat) and the nearer the fibres are towards bc, the lefs they are aéted on: hence at f= — and of all the fibres in abcdefg =< xX ef, and the fum of all the powers in the whole feétion, equal to the fum of a ? oe an all the —+ X ef, let g and g exprels the diftances of the Centre of Percuffion, and Centre of “Gravity from c¢ g the axis of motion; therefore the fum of all'the2— Pg m= Sf. x abc, there- Tv (a % fore the ftrength of the beam at ¢ = gf x ERG. we. fuppole the length A.B = J, then aoe ye £2. : when drawn in dire&tion of its length; z.¢. fup- pofing the tibia to be an inch in diameter, and a foot long, if fupported at both ends, and 30olb. would break it, when applied lengthways it would require 2700]|b. N.B. In the former part it was fuppofed the pillar was fupported, in an horizontal pofition, only by a block at one end: if fupported on both ends, and the weight breaks it in the mid- die, the axis of motion will then be on the up- per fide, and from this the Centres of Gravity and Percuffion muft be meafured, as the un- © der part in this pofition is put to the ftretch: in this cafe we muft divide it into two cy-~ C linders, x ERG will exprefs the refitance