Viewing page 122 of 140

This transcription has been completed. Contact us with corrections.

118.

     Explication

[[top image:  Drawing of a band B C stretched betweento rods E G and F H. A weight P is suspended by cords from another rod I L across the middle of the band of paper.]]

  B C is a band of glued paper or tin, nailed upon ye two supports E G, F H being of ye length C B there is put a small stick upon the midle of the band and there was tyed at ye ends which passed a little beyond ye paper cords to carry ye weight P;  for if we should put a cord upon ye band of paper, it would wrinkle it or cut it;  the band being of paper of six lines large was broken by a weight of four pounds.mt

[[center image: A band L I suspended from structure G H at point L, attached to another structure M N below at I.  Dotted line P at mid point of the band.  A weight is suspended by cords K Z from M N.]]

  A like band was broken after the [[strikethrough]] four [[/strikethrough]] same manner when the support were less distance from ye middle and when ye ends being wound about ye two small cylinders G H M N, there was tyed a weight to ye lowest cylinder by means of two cords as is seen in ye figure the band was broken also by a weight of 4 pound. 

  Some object that the cord, K Z carry one part of ye weight and that its weight is not employed to break ye band I L;  but it is evident that ye band carrys all that wch is below it, wether the cords are intended or not:  To prove it I have made ye following experiment.

[[bottom image:  Drawing of a coil or spiral A D B suspending a weight C.]]

  A thread of copper turned spirally and sustained by the hand in A having ye weight C suspended at the end B was extended after a certain manner by this weight more or less heavy, but all ye spirall distances were perfectly equal, and when we hold our hand at D, ye distances remained ye same without charing, which shewed manifestly that ye extension of ye upper spires when ye suspension was in A did not hinder ye force of ye weight in respect of the inferior spires.  The same thing happens to a cord which supports a weight:  For all ye parts [[?suffer]] ye same extension without the superiors diminishing extension of the inferiors or the inferiors that of the superiors, and a long cord and a short support always ye same weight, unless, it sometimes happens that in a long cord there is found some defect whereby it will bee sooner broke than a lesser.

  The same things happens to bands of tin for in a long one there may be a defect wch may not be in a shorter and if we take from it ye part wch is broken, it will support a greater weight because ye defect was taken away:  I have made severall experiments.

Transcription Notes:
mandc: Reviewed and amended image description, changed J to I.