This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1910 Excerpt: ... a condition of internal strain which acts to
lower the breaking strength of the thread. Coarse threads would be
subject to greater strains than fine threads, and therefore we
should expect them to show a smaller tensile strength than the fine
threads. This is in accord with the results of experiment as shown
by the data of Table I. Inasmuch as the error in measuring the
breaking strength of any particular thread was relatively small and
all strains tended to decrease that strength as measured, I have
included in Table I only maximum readings: that is. readings which
gave the greatest values of the tensile strength for the several
sizes of threads. Average readings gave results some twenty per
cent lower. Curve A of Fig. 1 is a plot of some of the individual
maximum readings of Table I. It will be observed that the measured
tensile strength increases very rapidly as the threads are made
thinner. A similar increase takes place in wires and glass threads,
and is attributed to a "skin effect." This increase is shown in
Curve B. Fig. 1. which represents the results obtained by drawing
out glass threads and determining their tensile strength by the
method already deserihed. That the increase in the case of glass
threads was due in part only to the "skin effect" was indicated by
the fact that the tensile strength m ea su r ements for threads of
different sizes were made more nearly uniform by carefully
annealing the threads. This was done by hanging the threads in a
vertical iron tube with a small weight attached to the lower end of
each thread to keep it straight. The entire tube was then brought
to a temperature slightly below the melting point of glass and
maintained at that temperature for one hour, after which it was
allowed to cool slowl...
|Country of origin:
Indiana Academy of Science
||246 x 189 x 8mm (L x W x T)
||Paperback - Trade
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