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The future water supply of Philadelphia

Publisher
Elsevier Science
Year
1887
Tongue
English
Weight
272 KB
Volume
124
Category
Article
ISSN
0016-0032

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โœฆ Synopsis

Note on Loug Columns: r3~Y

According to Mr. Johnson's rule, it will be found that for while ;~ine, Euler'sformulawouldhavetobeusedfor(-l-)greaterthan 60, for which length ratios, P _4 3,600,000 l = 55, beyond which, and for yellow pine the limit is d I ~ --5,544,825

But it must be carefully borne in mind that no experiments can. be appealed to to substantiate these last values, which are much higher than sometimes given.

It should be noted that for " round" ends, Mr. Johnson used, Euler's exact formula in the table above, but the experiments on. iron showed that for flat ends, the coefficient 4 zr 2 = 39"48 of Euler should be changed to 24"67, which is probably on account of the unknown eccentricity of the load.

Tt~ FUTURE WATER SUPPLY oF PHILADELPHIA.

๐Ÿ“œ SIMILAR VOLUMES

Surveys for the future water supply of P
Surveys for the future water supply of Philadelphia
โœ Rudolph Hering ๐Ÿ“‚ Article ๐Ÿ“… 1884 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 772 KB

S~,rvejs for ~uture Water Sup\_ply. 225 the line before mentioned, near Lederachville, after crossing the Skippack two miles northeast of Skippackville, and passing through another ttmnel. Topography was extended sufficiently far to examine still other alternate lines. Only one line remains to be