New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1856-11-19
INDUSTRIAL IND SCIENTIFIC INTEL
LIGRNCE.

columns, has perfected style Of boat i"f snIpP.e
and military purposes which seems 70 possess 'a'aA oo
Qualities. II is made With double sides, containing
some inches Of air between the surfaces, whieh rem
ders il a e-bost suitable for any emergency OF
capable Of being made in lighter form, wei hu'Pe"
for general sryice in which form suosian'ial ooa'
eighteen feet long and four wide weighs only from
four HUNDRED 10 six hundred pounds The grea, lea
tuIe of each is the capacity for being compressor "o
narrow limits and secured in that condition, 40 that
several nay be slowed in the space occupied oy one
Of tie Ordinary styles. The service boats, Is
affirmed, bld into thickness OF SIX inehe-, anu tae
" life boa.s" into thickness of twelve ioches-the
lergth AID depth remaining very nesry the same a'
when expcrded-
The material is galvanized iron securely fastened 10
,rorg oak france Aspscies of truss stens 'ne cen
tar lire on the interior and 30 this the bow ana stern
are connected by kind Of shpj int. Each han oil tue
bottom is attached 10 this truss BY stout hinges, anu'
in the act of colapsing folds up against the uu's,
willie the sides, which must be previously relieved Oh
The thwarts and Of the various iron ties Win Turn
buckles which sien them, readily follow, ana are re-
aimed until occasion demands the expansion OF the
whole aesin into boat as before. The detals are
stro1 Gil convenient. so that no difficulty is likely
to occur in putting the boats in readiness IN a ie"
Minutes.
The joints are covered with water-tight CLOTH 40
as TO allow sufficient mO.ion-even the connecuon
between the bottom ard sides being kept up IN THIS
msnnethe parts being propor'"ned that the o'o'a
is always maintained intact, without strainnS OF mach
folding aId always ready TO preserve every JOINT per-
fectly water-tigLt.
FOR military purposes notifications are nade
which admirably adapt the uveDtion to serve the pur'
poses both Of wagons and p,ntoon bridges. foresa
Pal, nts have been secured, and Mr.. thompson, aUer
on exhibition in the Merchants Exchange and else
where in this city, intends visiting Europe with fully
equipped boat for each of the principal Governments.
Eight Of them, preciselyas above described, are now
being constructed for the mammoth steamship Adratic
The great objection raised by ship owners TO full
,u1ply of boats for the escape of passengers from
laundering or stranded ship or when enveloped in
flames has been that sufficient space could not be al
loed to boats without so numbering MP the decks as to
make it difficult to work the ship. How far Nh
Thorn sons invention will this difficulty de-
ponds on how few new evils may be found to attend its
uee but so far as yet developed the invention seems
extremely important The Only boat yet completed is
service boat for Gen. Harvey to be used in the Ever
glades Of Florida.
Susry's RseFSERATIyE STEAN-ENGTyT.-Tho only
ground On which superiority ever looked for in
Ericssons Air Engine over good steam engines was in
the suppoted practicabi,y Of resening portion of
the Leaf in the air which had been used and
eml loving it to aid in heating the air required for
the text succeeding stroke. Encsscns experiment
was in tie main fiilure but not on account Of any
fallacy in this principle. Ercsson's engines "burned
out OF in other words the metal rotIed ia consequence
Iao n air effi
Cha, w. Siemen an English engineer ard inventor OF
col siderable note has sirce endeavored to apply the
same principle st, mes and with such success
that there are now several engines this principle in
constant operation at the works Of Newal Il Co.,
Gateslesd. and in France and Germany, each from
fl, to forty horse power. The engine as described
by the inventor before the Royal Institution OF Great
Britain, seems to possess feature common also to
aud all other schemes OF the kind which
ust forever operate to ttder its general nttoduc-
tior-tLs is gre at weight and bulk, compared With
the poaer developed. Mr. Semen employs wire
cauze regonorao,s, quite similar, It would appear to
Elicssons and uses the st in highly superho ated
stat. II e. at a temperature OF from J0GO to 1UJO
Fahrenheit. In consequence of this high temperature,
we might anticipate a rapid destruction Of the iron
broua which this heat is transmitted from the fire;
hat bis heating vessels will last rum three to five
years and being Only pieces of rough casting that
be replaced in few hours a. small expense, he con-
ludes that he has partially solved the difficulty aris
NC from high temperature. We notice the affair as
BIZ invention smed to be in actual operation, but the
actual economy realized if any, not definitely stated.
PREsEkvIYG TIMBER FROM DECAr.-The late st
and simplest method of expeliDg sap from wood and
,t., Nth
scnbed as Dr. Boucherie process in report recently
publis he'd by Day & Son, London. The plan requires
no expensive apparatus, the prescrvatlve hud, sui
phate Of copper being applied under pressure which
tends TO drive out the natural sap IN manner ex-
tr mely primitive, which is as follows;
Soon after the tree is filed sewcut i, made in the
center through about 9lOts of its section. The tree
is ,hen slightly raised by lever or wedge at It's center
and the saw cut is then partially opened. piece OF
string then placed round the u close 70 the outer
ofthe tree the support then whdrawn,
aid the saw.cu closes on The string thereby making
W ater.tght joint. An augur hole Is then bored Oh
liquely into the saw cut wooden tube Is then driven
into the hole the oopical end Of which is attached to
flexible pipe, which in connection with cstern or
reservoir at elevation of from 30 to 40 feet above
the tree Intended to be preserved.
"When it is Necessary TO prepare timber In long
lengths q cap is PLACED on the end OF the tree, by
screws or dogs. DR. Boucherie has foend that the
most tficacious pollution Is composed of sulphate OF
COPPER and water, mixed in the proportion of by
Weight of sulphate Of copper to 100 Of water. The
streI 9th is easily ascertaihed by any intelligent work
man by hydrometer. The specinc gravity of water
A. CCo Of FuhreIhe being goo, if per cent of sui
pl ate Of copper Is added the specific gravity will be
! CC6 Ieaiy:
hiss been ON sufficiently long to have expelled the
san. and been replaced By the solution by Of
,i-tc a. potash liza piece Of this crystal is rubbed
TIE timber when it is IN damp state, II viii leave
=. shass 49, 80. b.
81 efficiently impregnated with the copper. The sap
containing at most OOOth part Of organic matter in