Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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Rope about the Axis of a Crane did not only hold it, that be
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ing drawn by the immenſe force of the weight, which it held, it
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ſlipt nor ſhrunk not; but that moreover turning the Crane about,
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the ſaid Axis with the ſole touch of the Rope which begirteth it,
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did in the after-turnings, draw and raiſe up vaſt ſtones, whilſt the
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ſtrength of a little Boy ſufficed to hold and ſtay the other end of
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the ſame Cord. </
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<
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>The other is at a plain, but cunning, Inſtrument found
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out by a young Kinſman of mine, by which with a Cord he could
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let himſelf down from a window without much gauling the palmes
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of his hands, as to his great ſmart not long before he had done. </
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<
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>For
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the better underſtanding whereof, rake this Scheame: About ſuch
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a Cylinder of Wood as A B, two Inches
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thick, and ſix or eight Inches long, he cut a
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hollow notch ſpirally, for one turn and a
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half and no more, and of wideneſſe fit for
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the Cord he would uſe; which he made to
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enter through the notch at the end A, and
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to come out at the other B, incircling after
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wards the Cylinder in a barrel or ſocket of
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Wood, or rather Tin, but divided length
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waies, and made with Claſpes or Hinges to
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open and ſhut at pleaſure: and then graſp
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ing and holding the ſaid Barrel or Caſe with
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both his hands, the rope being made faſt
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above, he hung by his arms; and ſuch was
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the compreſſion of the Cord between the
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moving Socket and the Cylinder, that at
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pleaſure griping his hands cloſer he could
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ſtay himſelf without deſcending, and ſlacking his hold a little, he
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could let himſelf down as he pleaſed.</
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An Hand-Pully
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or Inſtrument in
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vented by an ama
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rous perſon to let
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himſelf down from
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any great height
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with a Cord with
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out gauling his
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hands.
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<
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>SALV. </
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>Aningenious invention verily, and for a full explanati
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on of its nature, me-thinks I diſcover, as it were by a ſhadow, the
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light of ſome other additional diſcoveries: but I will not at this
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time deviate any more from my purpoſe upon this particular: and
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the rather in regard you are deſirous to hear my opinion of the
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Reſiſtance of other Bodies againſt Fraction, whoſe texture is not
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with threads, and fibrous ſtrings, as is that of Ropes, and moſt
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kinds of Wood: but the connection of their parts ſeem to de
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pend on other Cauſes; which in my judgment may be reduced to
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two heads; one is the much talked-of Repugnance that Nature
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hath againſt the admiſſion of Vacuity: for another (this of Va
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cuity not ſufficing) there muſt be introduced ſome glue, viſcous
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matter, or Cement, that tenaciouſly connecteth the Corpuſcles of
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which the ſaid Body is compacted.</
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Why ſuch Bodies
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reſiſt Fraction that
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are not connected
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with Fibrous fila
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ments.
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<
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>I will firſt ſpeak of
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Vacuity,
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ſhewing by plain experiments, </
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