New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1890-12-28

and ,r.a1cr rs barnaceS are added. Naval Constructor
I,,bh,rn bold, that the docking Of metal bottom
j. heoutely necessary three times year. at least In
o,,r that the ship may retain moderate speed with
an, tho excessive expenditure of iuel"; and that "a
conner bca he'd bottom will require less power to drive
II than AN iron bottom painted, even though the former
carries the additional weight of shcatling."
,rh. question has been raised many times by those
onn,cnt, 10 shcathug who have not fully understood
tI sv.tem Of ,hcalhng What is to prevent galvano
,ctiou where copper shcathing is uNcd' Many Of the
I,b ,tocl war ship, are of the composite type and
many Of them ,hcihed with copper. Constructor
Icbborn made = most thorough and careful study Of
all of these fact, when he officially visited the
Furopean dOckyard> in lo7i; and his report thereon
f. ,be secretary Of the Navy most complete in
detail lie describe, at length the manner OF shea hing
% n the English war ,cl>, and explains most
nrabcnsively the manner in which galvanic action
iotu-ccn the composition bolts and the plating i
,ro~crcd The General practice i, to sheath the
lei fir, with wood. and put copper Sheets the out
,de Of rh,. The Active l. one Of the vessels cited
rs being ,heaihcd in thiN way The barbotte cruiser
Irncrcuso j. ~lc;tlcd with two thlCkncsScS Of wood
and i, m,allcd over outside Of th>. The Caope, tho
vc,cl that escaped disaster in the samoa hurricane
when the three American naval vessels were wrecked
is iron and steel corvette and !, also 'neai hnn wh
in ,pced materially by the slcathing.
referring 10 he practice Of the German Govern
rcnt Constructor Iichborn notes cruiser corvette
Stern posi- Of bronze metal. and the iron skin is
double panked and ,hcathed witt copper and vet he
need Of vessel i scarcely affected.
IN Russia. where the vessels are built OF Russian
steel with the exception of the Ike lplacs and rvefs
which arc Of iTon many of them are shea'hed and
cnnn,rcd The wood il worked two thchncsScs,
rho inner being coated with tar or competition
iii. system Il the general practice Of the Russian
,duir,ltv and they earnestly advocate Sheathed ships
b,yjn. found paint with satisfactory anu fonling
properties. .., 49, A..
MANY If the French vessels arc constructed on the
me nrinrlplc IN" Engli,h composite vessels ANA
other, are ~h"aihrd and cOpprrrd.
The question shall the steel vessels 5e She1thci
mr. NOT p" rc.- upon fire specific lines of argument
Tr.t The putting of ~heathne j. an additional cN
,,r-c which the advocates Of that method maintain
!. ,rououl, 90 the end ~ccond-Thc additional weight
~ hc,thinc increases the ships di~pla' mont ana Uses
~, n, 80 much IN" power needed for driving her
homo. the rn-hrith"d vessels ~" much the fastest.
Ia ,bis m, -hc1ill'uC converts reply II VIII rcPur"
L. ro,ver H. dri,, = copper >hcathcd bottom than an
t,u lnit1in painted and thus c0uui"r lllnc" for the
,dd.,ional weight Third TIA" application Of copp"r
ehc,fh.uc viii OF -alvanic action between tn"
hcarr and the ~t"" hull. thus SERIOUSLY d"trrioraing
Tho latter To- thi~ the an~V"r b. that every care IS
.Lon ~ prcvcuf action between IN" composition bolts
ID mating.