The sun., 1895-02-03
TO PROTECT STEEL HULLS.
REMEDIES AGAINST FoULING AND
CORRoSION SOUGHT TAINLP.


Importance ora Clean Botton 20 = War ship
Devices to Protect Vessels from Barns-
cies snd Grnss-The Corrosiou Problem --
Advantages of sheathinE with Copper
aud Ziuc The Japanese Trying Lacquer
topper Plating n Vessels Hall
Ever since ships first were built men have been
seeking plan to prevent the bottom OF vessels
from becoming foul Since the era OF iron and
steel ships began the problem has been compli.
Gated by efforts TO invent something that will
prevent the fustnR or pltting Of the metal bot
TOMS and the double problem is by no means
solved yet.
The importance OF kecping the bottom Of n
war ship clean cannot be OvCrestimatcd. The
following facts taken from paper ON Expert
ence Gained with Our New Steel Ships as Re-
CARDS Care aud Preservation" by Chief Con-
structor Philip Hchborn, U. $. n, and read bo-
fore the Society OF Naval Architects and Marine
Engineers, Nov. 10, will give good idea Of tho
effect of foul bottoms:
"a recent instance is that OF the Bennington
tgunboat. In making the run from Acapulco to
Llbertnd, May l7-"0. 1904. with clean bottom,
the ship traversed GT5 miles in ~ hours, with
coal expenditure OF o. tons. Two months later
July $3.50. she returned over the same course.
traversing OsS miles in III hours and coilsum-
ing l2O tons of coal, or almost exactly double the
quantity used when the bottom was clean. The
cost of coal for this passage was Sl,I53.00 going
so"'n' """ re'u'"''E ""H 90 o"."o M "''''-
I""'i oost ''t '"'s snoFI '.,''' !" Si,'f''io' uuo
s"'''S W ,Vu'''s y. Wv '"'.o" ~ ~ WV '"on','
t.h''' 'oS'"es ''Ni"s ~ Ho"'' io"he' W n'"No
'no p"ss"Eo' >,
made an examination in 1902 Of the steam logs
U, ee''i"i snlpS' "t," snu"tu '""' l"e t'u's'r
onnr's'oh s'e""'cu ~'o' un9s "I speeu OF
% Nno'e q" ho"'' w. 'o.s Vi 'o",
u'S' "u''" sa'' ii.f i"u'"S VI ".''o" Vi Quo
A'' nv, ~ 'O' os o ''' N,'"'' "i
lhS ano'neF p"aS"so' "hV" S'o h'u u'eh SIX
"on'"' o"' VI VI uo.N' '"e '''"'ieu ~ - ""ss
~ ,'o H"ho spe."' o'' 'o,'su'i." o"'f 'ois Vi
go ',r, w., 'e.u,'''H t,o ,"'" Va "'''o'' w -''"'
nios nv i1l "'' "." oI' inout"
OUT Vi uock' AN" therefore WIN cream oot'oin'
s'ea''eu ~, "n' "' epo'u u, "'o MINUS mn
h'"t' "e,"s i''' sons W Io"i "a'IS' R,''"H
,"uu' Va ".'''" VI ''," '''''' Z, i'o.''ii an"
nal ia.', ''o '''"i''0. 'N'''ee" ""'S at sie"u
". u hno'' "h no"r' burning W IONS
Va eoa' d "as' iLiS Feuu.eu @ iiot i"uius Vi "'loh
W go uiiio'. Inv ih'iaoeipn'a "heh out OF
aoeA hVe 'hon,hs' s,cu'heu "' ~ KNOTS ior @+.l2
u"ss, 'o"e"n'''s 10 'o''s VI ''"' l. u''S oh
Ano."e. 'o'aeo epeeu VI il'o Aho's was kept
up AZ, -''f u"S @ o ~ a" eNpe'ee VI all 'uhs oi
CIV. % ""i''' INC '.'i t"A''s'o' easen anu one
na'i "oh'i,' o"' Vi "oeA' s,e"iheu Loo uaSsat
s'p''o Vi -" N"'''' '"'"i's ao' 'o'S oi e"al
u"s' "," "",,''s 'H"' i"uius vi a'toh Vi
o',o n,s. nen ner uo''o''' was cream s'e
nh'uo oo hn"'s iof io'o' u"'S' Win eonsunp-
t'on Vi ou' 'i'' tohs Vi eo'i uaS' anu lhereoy
increasing ner rauius Oh action 10 t'-3' mics.
As .h' ia''"a u, ACTON vi sup N thehuihoer
vi ,h'4'e eae eouu ''a'ei us'hs 'he iuii capacity
VI nv .o'' o"""'iS IL 10 ". oi'ee e' ''"en' 'i"t u
ioui oo'tom III decreasing the radius decreases
'l.r %,' nsn'.ns e'n''ehSy oi tne snip.
ino CRUISER Ne" iorh "neh s'eahihe at ~
N""'s WIN iou, oo'tom consumes tons OF
'oa niofo "'' 'ii"" when cream! 'he Newark
=. ~ Nho.' ou''s a. 'ons norc' inc betro't "t
Az MINUS IONS more the fetrel NJ KNOTS j
.o"' niore, anu 'ho pai''n'oFe III ii'' KNOTS
~ 80 VINO '''e'
t''se iae's n''u INJURIES shu" that the matter
o' h'eo'hR snip oo'toh cleah Is ono OF vital
'npoi" Inv" 'i'.to 70 'ho puos'ioi' Vi the cor
,,i VI '.'o s'eot "uu ., 'ho Sa't water, Inc
I",'u''S win WHICH t"'S goes ON anu the Pc
ss", .. .,U W "A,on :. may 10 III
u"oeu Warrant tno s'n'e'hSi'. that IL snip were
no' p"'ii''' ~ "il sne "outu i"s' proo"o'y ABOUT
' 80 ' '. N'' sA','' VI "uts'ue
p's'' "o"iI ~. o".en .i''ousi anu tnroush, 10
'' ""''''o Vi ,h' ''ip"'"''e'S minor matter
y. s'N y. '"' ''heI's "nu grass III 'ie oiu
10. VI "oou.', ,oppei-sne"'heu sh'ps' dock
,s meant o',S .ne '''io'"' VI marine parasites
.'le N'''s u cruiser en.a'iS' pes'o's
'u's, u ''r'iui =, search lor inc pi''hss OF cor
H A''' w, ''s'o' '''o ''sseis
OF our navy rely upon several coatings of paint,
which In some cases have proved failures.
wbo, Tho war ,bi, "a mt i,,o ,ho L., ,o,
, - ',1 ""t 'Np 20 pu' NV" '''e "'s uoek
the hrst thinH attended TO Is the re movRl OF
barnaces and weed Bluejackets swarm the
scofroldinc about tho v.as.I,s ill., ,,or,in.
- W. ~ '' ''"'S' "''A'"s
away with their trianGular-headed scrapers
until every growth has been removed. Next the
point Ia scraped off md tho shine on,;r. ho,,o, |
P' 40 ,"r'' W va anu M 'he eh'P eh'''e uo''om
well scrubbed with stiff wire brushes. The ship
Is then In n very clean condition and ready 10
roc,;y, b.r ,,,s, oo,,ir, L,,.,,,,,,,aa !, -, -, |
is.'N' nor ''s' 'o"''''k EHper''nee mas proved
that the pest preserVatire FOR steel IS red lead,
and this is applied as n base coat upon which
are nloceJ oddi,io,.l coats -, rod In,J and mhto |
i ~ ~ Va i.u '''' "''' " h''e
zine, ono or the many ant-fouling compositions.
Tho formul,r of the latter are secrets OF the
nr,,,c,n,, oom,o,ios L,, 4, 4, al, a.. |
p'eN' nN 'o"p"'e' pu' u - S"u that
many or them contain arsenic and other poi