D. VAN NOSTRAND. 3
"Williams on’s Meteorological Tables.
4to. Flexible Cloth. $2.50.
PEAOTICAL TABLES IN METEOROLOGY AND HYPSO-METRY,
in connection with the use of the Barometer. By Col.
R. S. Williamsox, U. S. A.
Merrill’s Iron Truss Bridges.
Third Edition.
4to. Cloth. $5.00.
IRON TRUSS BRIDGES FOR RAILROADS. The Method of
Calculating Strains in Trusses, with a oareful comparison of the
most prominent Trusses, in reference to economy in combination,
etc., etc. By Brevet Colonel William E. Merrill, U.S.A.,
Major Corps of Engineers. Nine lithographed plates of illustrations.
“ The work before us is an attempt to give a basis for sound reform in this
feature of railroad engineering, by throwing ‘additional light upon the
method of calculating the maxima strains that can come upon any part of a
bridge truss, and upon the manner of proportioning each part, so that it shall
be as strong relatively to its own strains as any other part, and so that the
entire bridge may be strong enough to sustain several times as great strains
as the greatest that can come upon it in actual use.’ ”—Scientific American.
“ The author has presented his views in a clear and intelligent manner, and
the ingenuity displayed in coloring the figures so as to present certain facts
to the eye forms no inappreciable part of the merits of the work. The reduction
of the ‘ formuks for obtaining the strength, volume, and weight of a castiron
pillar under a strain of compression,’ will be very acceptable to those who
have occasion hereafter to m'ake investigations involving these conditions. As
a whole, the work has been well done.”—Snüroad Gazette, Chicago.
Allan’s Theory of Arches.
18mo. Boards. 50 cts.
THEORY OF ARCHES. By Prof. W. Allax, formerly of
Washington and Lee University. Illustrated.
“ This little volume is an amplification and explanation of Prof. Rankine’s
chapters on this subject.”
