The sun. [volume] (New York [N.Y.]) 1833-1916, 1892-07-31
worms ON sorxvos AND nDusr.x.

An improved system Of wooden psvsments
Is described in the Revue RatiQue des Trapasrr
Fablics. one Of the principal points in which
consists OF concrete foundation six inches
in thickness. and made with three hundred to
four hundred and forty pounds Of Portland
cement to mixture Of nine cubic feet Of sand
and twenty-seven cubic feet Of gravel: as soon
as this has set the concrete Is coveredwith sew.
en- -sixteenths inch layer Of mortar composed
OF six hundred and sixty pounds OF Portland
and Ieit to harden for two or three 's days the
| blocks being then set in rows separated from
S Sss X s4aSs sFs sa WITH &
and tsSkD over s1 The
&. ss9 O sn 81 'fGe
wheels. Provision is made for the expansion
ways space a o. about a two inches wide is LETT
%itS sand II e i isst Via N *
sss 9v to have taken PLACE , IN fifteen days the
half Inches long the duration claimed is about
seven or eight years under heavy trafiic.
In a discussion before tho Royal Scottish
Society Of Arts. Edinburgh. on the best moth
DDS Of using hoisting machines. q paper was
road by one Of the members. tho purpose Of
which was to show. In the authors opinion.
the advantage OF electricity over the direct
use OF steam and other means Of transmitting
power to cranes. According to this authority
the IN, modern eleetromotor is a highly efficient
instailatIons: in which the dynamos are
ass' II Il. 'fnsn e ss
CINE is given out by the dynamo. and. whore
h % pows sFen on
se seE Ing ns sSSh only Re ten
or n MINT n oh Nv Avo mt nd tho
loss In transmission. will not exceed two per
cent Dealing with the application OF motors
certain draWbacis to The use II steam n derroSs
arc In great measure conn ected with the boiler.
Comparative experiments made with view
to ascertain the kind OF stone best adapted for
roads show that the specific gravity OF X
is really no indication whatever OF it's ,ss
for such purpose slate. for example. weigh
ing IT'S pounds per cubic foot and pure mica,
weighing about 1873 pounds. being entirely I'M
rock has no superior for this use. after this
considered the differences in duality that exists.
rendering It much inferior to the former '''''
M Le Chatelier. French metallureist,
states that. by means Of his pyrometer. he has
discovered that the temperatures which o.
our In melting steel. and in other Industrial
operations. have been overestimated. These
exaggerations are due. he says. to several
causes there being when estimates Of tenn
perature disagree. a natural tendency to adopt
the highest. because Of the desire to establish
some sort Of proportionality, between the light
fuel required. and the temperature Accord.
lions. the fact is that both tho amount Of light
nm nfi fv 80
fuel required to heat Il increase much
more rapidly than the temperature. The
auentiy adopted for determnins hsh temp per-
atures. the e. assumption nId being made in this
balls used is constant. which assumption is in
semss Ss the Of the issu
degrees Cent. because platinum appears to
melt rapidly n It This again does MT e9in
being. as ascertained By him. that piatina ans
does not fuse in the flame. but only appears to
drops Of molten Steel carried over by the blast.
Ono Of the most striking improvements In
bolt manufacture at present is the rarity with
which riveting is resorted to. 1t being found
that double belt. we'll cemented. is good for
all ordinary purposes. rendering rivets SUPER
fuous: at the same time. fastenings such as
endless copper wire screws. which do not OBJ
struct the surface or unnecessarily stiffen the
belt, are an advantage. this being especially
80 when the belt comes in contact with water
or too much oil. as such fastening prevents
the leather. firmly together. All main
S5yf have s To- be %s. nshss
Ing OF two or more pieces OF leather cemented
toeether-that is. the average hide for betting
a9ss n01 conan more tnad Iorty tncnes In
rarely exceedine this. and. thereiore. Vida
main belts are necessarily made in sections:
9rdinariy TOO. tne pieces are not iapped paral-
inch double belt receives two 3o.inch nieces
Tor the first layer. laid side by side. and q 90
inch niece over the centre OF the two iower
pieces to break the Joint. and two 15-inch
to complete the width. and thus the ieatber Ia
cemepted together. 49,
Another method has been proposed for the
pIoouction OF ar''hc,ai stone. BLOCKS OF granite
whlch nave been subjected 20 sumcient de-
gree Of heat to disintegrate the particles are
pulverized TO a certain flneness. and ara tban
.r,.,, AZ .dai.ion =, 1919 ..a.,a, . sAou'
with the adoition OF certain material. trans