New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1864-03-26

the boiler OF soft metasuch as copper from tho con
depser tubes-it was considered would induce suoh ga
yanc action as might affect the iron. But the Analysis
showed there was scarcely trace OF foreign metai
there The tubes Of the condenser and copper P'pgs
were all in perfect condition. Even at the joints made
tight by India-rubber hardened by yulcanSing there
was scarcely speok Of oorroson.
search was then made to ascertain whether tne
elucy deposit present that arises from the uecom
position OF talow and oil used and without success
In case fat acid might be the cause pieces OF chus
were put into ~ boilers and from time to time ire1
pieces were added carbonate of soda was also ml1eu
with the feed water in regular Doses but Ill 10 no pu
pose. the action went on getting worse and worse
The practical knowledge thus acquired necessarily icu
him 10 the conclusion that the distilled water isci was
the cause Of the cOrrosioD instead OF BaVhhc ac,o
any FIFTY ncd In reference 10 the question whether
distilled has any particular action on metals the
chemist Berthicr found thot nodular protuDeranccS
deposited ON iron pipes containing olstied Wa'cr uo
sisted or u per cent OF proOxde Of ron - per cent oil
peroxide of iron per cent Of caIbOno acid. l4i per
cent of water and u per cent Of silica me IRON pipes
contained also puveruent substance Whch ooaiu DC
produced ut pleasure with distilled wafer 70 "hlch
race of carbonate ~ soda nnd common salt bird Deen
added but not with the addition OF caustc akali Mr.
Ramsbottom stated at the same meeting that nc nau
fonnd similar effects in using peat wafer. when WIS
almost MS pure ~ distilled water. Both nc nn1 MI
Markham had found carbonate Of lime would prevent
cOrrosion Mr. Gray thought the corioding was due IN
locomotives 10 the brass tubes used in Engen1 IN sucn
engines for on examining the piticd plaes with mi
croscopc he had found minute speck OF brass IN inc
center of many pits" Nj Rulo did not concur ~
this opinion, III nppleu 70 DCiFIb III tohhtttWh
surface condenefs but thought just possible that the
fatty matter contained ia the grease had something 10
do with dclericeng the quality OF the water ana eas
Ing it's corrosive action. 49, -
At the conclusion of tho reading OF This abstrncf
Mr. SKwELL restaed some Of his views expressed a. a
former meeting.
DR.. PARMHLEE inquired whether snlphuric acid was
not employed In preparing the lubrcating compounds
used ana suggested that the presence OF small guam
tty might originate this cOrrosion
Mr. VEDDgR stated that the acid was not used In
preparing the talow. but il was largely in refining coal
oils and petroleum.
MIR GmFFIN II practical engineer sail he had found
the tubes of tw highprcSsurc boilers placed side by
side eaten away one had iron pipes lending TO H. ahd
the other copper The tubes corrotcd both above
and below the water-me. This evidence bears strongly
against the supposition that the cause Is galyanic
action.
The further discussion showed that in the surface
condensng apparatus and boilers Used IA this country
no serious effects have been Observed when the copper
tubes Of the condenscrs timed and small quantity
Of salt wafer is used IN the boiler
Anor selecting the suhlec, OF Iron" for The next
discussion. the Association adjourned 30 Thursday
evening. March q.