Page:Timber and Timber Trees, Native and Foreign.djvu/240

From Wikisource
Jump to navigation Jump to search
This page has been proofread, but needs to be validated.
220
TIMBER AND TIMBER TREES.
[CHAP.

As Elm timber is best and most durable when worked up soon after the tree is felled, it is not necessary to keep in store more than is required from year to year. If, however, it should be thought desirable to accumulate stock with the view to provide against emergencies, it will be most effectually preserved for future use by keeping it constantly under water, or burying it in mud.

Table CXIV., showing the transverse strength of this wood, is not so full or satisfactory as could be desired, owing to the difficulty experienced in finding pieces sufficiently straight in the grain for experimental purposes. The Tables CXV. and CXVI., showing the tensile and vertical strength, are, however, more reliable.

Table CXIV.—Elm (English).
Transverse Experiments.
Number
of the
specimen. 		Deflections. Total
weight
required
to break
each
piece. 		Specific
gravity. 		Weight
reduced
to
specific
gravity
700. 		Weight
required
to break
1 square
inch.
With the
apparatus
weighing
390 lbs. 		After the
weight
was
removed. 		At
the crisis
of
breaking.
  Inches. Inches. Inches. lbs.     lbs.
1 ... ... 3.500 ... 578 ... ...
2 5.25 1.25 7.500 510 571 625 127.5
3 ... ... 6.250 ... 558 ... ...
4 ... ... 4.000 ... 553 ... ...
5 475 1.30 5.500 350 545 450 87.5
6 4.70 1.35 5.000 320 542 413 80.0
Total 14.70 3.90 31.750 1,180 3347 1488 295.00
Average 4.90 1.30 5.291 393 558 496 98.33
Retrieved from "https://en.wikisource.org/w/index.php?title=Page:Timber_and_Timber_Trees,_Native_and_Foreign.djvu/240&oldid=9225811"