The sun. [volume] (New York [N.Y.]) 1833-1916, 1861-03-13
Scientific Items.

lEos HrILrTNGs-rho advantages Of ire
buildings .Is Aus summed no By oas st NE -.sss
suin' nj cnE''IuC;ou In this material. IRA -
rra' hc.'i'g with which any architectural sesk~u
oan b, cared ru' IN lion ss',aS, ths gress scsas-
my ofspsea iuai nich ss simmer col arnn Of irs>
suquirod b. SIpIort . given wsight thsa -
4 tsrs coiumu essr eoIpstructsd-ss Q ca -
iunn YOU'D -,tl o. height of several .ailss -
trs its own w-lyht wc,ld crush n; third, eos~s-
ny of contrrst n o' foundations, and s.ssS - -
hnldng, Misunderstanding any ao,dcs,si tmp~l.a.
uo,A on pa tui tfo louDdAIiuns tutth, the fnaa-
", with which 40 buldl,sss may be rsasvsh
Lu,, srufty A. ..T-, gttnaS; tho esotr city ~
Ing d, Iusd over 80 large surface ts be hssw-
sss sisth, h.cil,Iy {. ventilation, sovslth sdus,-
lion oS Ugh, ,Hrpugs srys opsnipss; eighth, Surs-
Uili'y-cstlasting all ,sher substaaoss; aiash ~
coraluss b,b,y. In rendering buildings ars-prssk
especial s.ssn,on has hsaly bsen pad V The sas
iior work. peculiar fGrm Of girds< sm2lsysd \,
THAI ftwu pieces o. fs4a iron mosllng ia the es,-
1e, 70 The Lotion u shict, cast 20 OF thrss fSss
dep, acconfng ~ the weight " be assaAluai q
wrought iroi rod Ia secuud. The o'd bees. wss
formed By swinging the wrought iron us red isss
The cast iron srch above, antshGs was dass~ q
weakening stssr or both of the msssriais -
particularly II .r'Ing 100 tisha Ht were ~ Loco
'As subsrincumos.s weight might crush ~ a.
Iron bssbrs 10 would take any tensile strain upsa
The wrought iron. Ths advantage gained In SAs
cosnbnAsion Of tho wrought and oAAt iron, by mak-
irs the !At,sr in swo sections, u sha. II Ne 60
iron acsa nos como close together, 10 sansss ha~s
sny effscs Al all, nj the cat iroa will AAw .
bearing finally, and will bs as strung ~ II uaads .,
"a TIE diN instance.
TAo nDEnER ~ TINE solitary passenssr.
~ France recently, was tracked, aftsr jumpsa9
~ I'll, train, Ia tho following manner An e.
at impression of his footmark was taksa. a
hours subsequently,, by the following inss-
'us process sort Of Rrdirop, made q wire
was place over tho imprint, an inch from ths
ground. On this Vt .diron was deposited thl
piece OF tin, covered with burning charcoal. In
short time tho grorad beneath was heated .
the desired extent. The gridirou was then re-
moved and with tho aid Of a hair slave the ~
print was sprinkled with layer Of stearine, re-
ducod to an impalpabls powder, by dissolutisn
in alcohol AMI sudden immersion in cold water.
he powder obtained by tho precipitation u
this mixture Is so light that Its fall does nk
char sc tho position Uf grain Of sand. As
aud disappearcd. The soil was then given
time to cco', after which tho imprint, fuliy
impregnatsd with stearine, was dug up, entire,
and placed upon q square piece OF cloth, whose
corners we're then gathered together, so ~ u
furm Xii d Of sack. Moulding plaster VS.
then pour upon the imprint and the opsrstioa
Was complete. Such IS tho accuracy Of this
process, that II not only r1produces the gcnsr-
al outline of foot, or It's covering, bat every
n, mute particularly. IL a bare foot IL shows
the exact shape Of the sols, and the relative -
sitiOn Cf the toes If q boot Og ssOe tho AAosoS
OF wear sustained by the sole and hael the usm-
b,r VI nails, sc.