The sun. [volume] (New York [N.Y.]) 1833-1916, 1891-08-23

first, and he spent 900 experimenting with
her before she showed that his confidence In
her ability was not misplaced. Her lines are
extremely lne. She Is G3 feet long. tx feet
broad amidships. draws IS inches and has
displacement OF eight tons. Tho keel does
not project below the hull Tho keel Ia OF
steel and the frames Of oak ~ inches square
and 8 inches apart Tho thanking is Of ma
hoRany In two thicknesses. Tho outer plank.
ing 10 Ole Of an inch and tho inner 5-16. and
between the two 10 layer Of light canvas bed
ened 10 tho frames BY phosphor bronze sorrows.
The engine IL upright and OF the triple-ex-
pansion cUndensing type. Tho cylinders arc
o. IAN. and % inches in diameter. with nine
inches stroke. and develop 400 indicated horse
power. The engine weighs 1000 pounds. The
object OF tho inventor and constructor OF tho
Norwood was to get great power and as little
weight as possible in small spnce. Tho
shafts OF the engine are hollow and tho con-
Meeting rods are bored out tho entire length.
thus not only reducing weight, but giving
space for sort OF lubricating candle. Tho
three laded brass proncller 10 80 inches In
diameter and has pitch Of seven inches.
Tho boilor Of the Norwood is not. as has been
said. a Thorneycroft As may be seen by the
picture. which represents an ond elevation.
with half the casing removed to show the in
terror. the boiler has two steam drums. The
Thorneycroft has only ono. Tho Mosher boiler
is patented and no ono has intimated that It Is
an infring cement en- the Thorneycroft tyre. 1t
has 28 square feet OF crate surface and about
1000 square feet OF heating surface. To have
tho same heating surface a Thorneycroft
boiler would have to DO twice rs big as the
Mosher boiler. Tho boiler weighs O., tons. is
~ feet long. 6 feet wide. and ga feet high Its
pAn nj n mi n
small space In those respects 1t Is unlike any
other boiler with great power. and 1t Is thus
particularly fitted for launch or o small
yacht. Every ounce Of coal that Zoos into the
furnace OF the Norwood has pretty nearly all
tho caloric extracted from it. The lower part
OF tho boiler Is made up OF three horizontal
watcr drums. ono In each side and one In tho
centre Tho middle water drum divides the
furnace into two sections. Tho three drums
arc placed just above the crates, and nrs
united BY transverse pipos ut the base. The
hundreds Of water tubes spring from the
water drums. curving upward and con-
pectlnR with tho steam drums. Tho
mass Of tubes. or pipes. coming under tho
steam drums. shield the IN from direct contact
with the fire. Tho action Of the fire 10 always
upon solid surface Of metal, enclosing water
No heat strikes steam surface directly. All
Joints and fittings arc out OF tho fire. SO their
durability. the inventor says. Is assured. BY o
pecul:a construction of vents tho heat pene-
trates every part OF the boiler before going out
through tho smokestaok. which 10 over the
forward ond OF the furnace. The products Of
combustion pass under the two tunnels.
suggesting masses OF pipes connecting the
water and steam drums. and return to
the forward end Of the boiler. heatin.. the up
per tubes before going into tho air. The water
drums arc protected rom direo: contact with
tho fire BY hrebrlok Innings. The inventor says