30 
THE nner Ta AND AGRICULTURAL GAZETTE, 
[January 14, 1860 
of civi 
we sa 
agrtculbural lat 
plan of arrange- 
Bi harg Reen 
d, and t 
archi. to 
denoted by the name. The test which can be m 
| ennvenent applied s iron which it is iepesed 
o use of beam prey pillars; & 
art blow with a 
and 
atuster, the quality is bie 
th. Inallcases where ma 
a stipulation sho uld be in 
o a certain Aeri } 
done judiciously. We italicise this word, 
Sn sn 
reren aru 
a uate 
t|that which tebe broken. 
testing rte mole ot 
rials which it is Sac to place upon 
then by an approved formula to ca 
a | dihati of a beam whi “es il 
se 
| stantial 
We have long seen the frat in practice 
on the system generally hea 
by the r-testing iron re v9 and columns destined 
a to receive certain 
R 
Th 50 pe of ite poe 
ure | 
cal ab- 
n cone of a 
ne 
perfect] 
a 
appearance 
lace of establishing it 
weight similar in amount has, by the disturbance 
th 16 molecules of the iron, br oa it jag that 
: ld ah fara byre, 
s of the farm 
a less weight tha: 
n—Mr. 
rtinent and ecg 
d 
a 
bility of p Me ia a | 
= 
ey riod astoral farms, and suc 
now b 
y, a far uid 
öne roof, 
y very hi 
namel ing with all 
under 
as 
uld be | dence of i in aii do 
rded by m such a roof to Snabii of | tests, m 
cattle all ey and a sheep in the most storm ported a 
of t l 
might be | resisti 
open to con- | 
As an rd 
Rh niger oe 
ng powe 
al 
it has been n subjected, 
n find that it si not only receive 
injury in its elastic powers, but i 
rigs of fags rg. from a oi Ap of | o; 
what is bee 
rap Sa in ie 
pon it Was in 
owers 
are like the m 
sels ud the 
pre strained _beyond 
SIER 
ae imply, as oc 
poin 
ns ot this 
culiarities of 
ject, we now propose in what rem 
peper r to to glance at "a kinds and pa ecu 
their last and p 
cap Bt 
“ rome In test- 
ended by the great 
z it -a in the first pindo 
be 
kepa 
ee i “inst aiioted 
to load o 
| advisa 
pnd tenting, and the comparative 
adva. nt f its 
s for building be parposes, we Ca p 
ìt and 
divisions, 
à point of con- 
pfi icon are ‘east and 
is ee! Aa 
oe 
die shair i mPa 
Chetdnes bo micat tackt 
_ The fracture of grey iron. ts a 
appearance; as if particles of lead were 
ype the surface; the colour of the Wisture 
gs. 
ular 
“enaa F 
re |t 
is ben wier where pees 
ute „will [o 
tral teat, in order to compar 
| pores und 
ome ee si 
ou. 
point not exceedin one-third— 
safety will be secur: $ 
e 
ed, the 
eigited up to a 
but mo 
en at corr 
e beam wi 
* On the Application of Cast and mene 
Aoi ea By Wu. FAIRBAIRN, p. ee 
sult-of a less i 
d to one- 
detecting | the two systems. 
n t. 
e total ge of they i 
rs of | T 
one, careful ly north the cetfes ra 
er avery increase , till the | a 
fei Aires ‘hag thus 
e beams be 
EALE, 
of 
what ĉan be 
from it will be. 
stronger Bhan if the iron is melted in the ordin: 
furnace. 
Such at as the ignorance pre 
n the anbject of iron, that practical men deem 
appesi ble 
mgr 
d | blas 
is) 
È 
ala of rs iron produce ce 
Much ae of opinion 
r, F. Says, ‘ Gen 
choube infer that it (the hok 
weak 
catty ive con structive 
as a tende 
otherwise,” 
and the same 
under the hammer, Py 
and is term aa er a 
pond pw hammer while hot, : 
‘ wes dae ark and į 
è may now com brie o two qua 
iron, cast and perience f= f the 
