New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1865-08-05

all their parallel and extending from marris u
margin OF the plate. In combination Of these pstss
curved az required for practical uses It 10 Incumbent
that the oorrugaons OF all the plates In the dlrsc
ton Of the arch formed by the curvng and IL does nos
require any large amount Of reasoning to show that th
form Of structure must possess the very elements o.
strength combined in o mastery manner In the osss
Of cylindrical boiler or fue buit on this plan tia
plates composing it become in smselres close .eriss
Of ribs stays by reason Of the flutes Of the corrues
tions and the riv'ted the plates sncircns
"The advantage gained in strength has been stated
tenfod but that this is below the truth there q ver
examined into and tested the invention As an illus
tration Of strength. introduce q test which Ma.
made % follows: -Four strips Of boilerron were used
each quarterinch thick and feet eleven inches
In length two Of them were corrugated In the direction
Of their length he folds being inch bigh and the
four bent ongitudinaly In the form Of an arch: he
curved strip: were placed side by side, in par and
weighted with Pig-iron; the first pair consisting Of
corrugated pair were loaded with n. 600 bs. without
sensible DETECTION"
The same principle vitalizes his Beam whereof
he says:
II was well aware Of the strength giving principle o.
the Arch. and the certain saving In material that must
accrue on Its adaptation to structure heretofore made
of more solid bulk.
"Experiment demonstrated tbat-by deeply curvin,
lengthwise thin plate Of metal into the shape d
beam or girder, so as to give lit the form
Of three lateral arches of longer sides than curves
the center arch inverted, and their axes In the
direction Of the bea-a structural form obtained
possessing power to resist force than actually
solid beam of the same metal and the same linear d.
mansions. Further investigation eucidated the fact
that the making Of the OF the arches proportion
atey thicker than their perpendicular sides resulted in
such disposition Of the parts Of the structure would
render it equally strong as composed altogether Of
the same increased thickness The strength of the per-
fected beam formed found to be to one Of
any Of ordinary constructoni while the raw material
saved amounted to so per cent. Of the whole"
Among those who bear testimony to the verify
and value of Mr.. Montgomery's inventions are
Messrs. Charles B. Stuart, Engineer-in-Chief Of
the Navy; Joseph Belknap of the Neptune Iron
Works; James Jackson, Paterson Locomotive Ma
chine Company; John Breasted and Edgar Msjo-
rey, Allaire Works; james Murphy g. Co., Fulton
Foundery Geo. w. Quintard, Morgan Iron Works;
W. w. Vanderbilt, Engineer Pacific Mail Com
pany; Fletcher, Harrison g. Co., North River Iron
Works, &C.. &c. Mr.. Samuel Snedcn, the well.
known ship-builder, computes that Sound steam
boat Of 900 tuns built Of iron after Mr. Mont
gomerys models would weigh two hundredtuns ea
and draw ten inches less water than if constructedof
wood. And Mr.. T. +. Rowland, of the Continental
Works, Greenpoint, states that q bridge lately
erected at cost of 5000 might have been built
on Mr.. Montgomery's plan for q 800; while it is
an important advantage of the corrugsting process
that it necessarily exposes any flaw in the iron,
instead of leaving it to be dsasrously made mani.
fest in the beam or plate when subjected to the
strain of actual use. We cannot doubt that Mr..
Ms inventions will at once cheaper those fabncs
of Iron which are exposed to heavy strain or pres.
sure, largely increase their efficiency, and prevent
many disasters from explosion or rupture. We
bespeak for them searching scrutiny.