The Pacific commercial advertiser. [volume] (Honolulu, Hawaiian Islands) 1885-1921, 1900-08-18

the deep anymore than the fastest
speed attained in naval architecture is
consummated by warships propelled by
the highest engine power, but by a
small superintendent boat which
will cleave. it's way through the waters
like piece of living mechanism.
At least that is what it's inventor, who
has procured letters patent for his in
vention and is about to start building
his first vessel in Minneapolis, says for
it.
That he is not dreamer is proved
by the fact that Mr.. Sawyer is master
mechanic for leading western rail-
road.
The principle of the new invention Is
combination of the ingredients of
railroad and marine construction.
THE principle I apply in my inven-
ton is an old and familiar one with
marine engineers and shipbuilders-the
screw propeller, says Mr.. Sawyer.
"As used to-day the screw propeller is
not a true screw but simply fair rep
resentation of one. Screw propellers
generally are maue with three or four
I fiat arms or paddles, which represent
the threads or fianges of a screw. ,che
water in relation to these represents
/ the nut. Hence the term screw pro-
! peller. But with this class of propeller
it is utterly impossible to attain a speed
of over eighty revolutions per minute
! in getting up a rapid movement OF the
vessel. Over this speed, the disintegra-
ton of the nut takes place, the propel-
Ter flies around, throwing off the water
and forming a vortex about it, with the
result that the vessel comes to stand
still, regardless of the fact that the en-
gines are pounding out ninety or more
revolutions a minute.
THE problem in shipbuilding to-day
when desiring speed is in the construc-
ton of the body or hull. The engines
are perfect. In fact, they are ahead
Of anything else about shp-givine
more work for the propeller than it car
take care of. The shipbuilder is cb-
iiged to produce a body or hull tina,
will make up the desired increase l.
speed.
L use the screw principle, but / APP
ply it In its complete and truest form
together with a perfectly formed auc
balanced hull believe l have produc.
ed vessel that fills the bill for spec i
When afioat my boat resembles the
whalebacks seen on the lakes, and OF
the drydocks it looks like nothing els,
but a gigantic cigar, provided with
large funnel at either end, that stand:
well up out of the water and serves &.
coming tower or pilot house anC
smokestacks and ventilating shafts.
Between these tunnels and com
pletely surrounding the main hull o
body is the propeller shell or screw
This revolving shell or screw is mad
to revolve about the hull on ball bear
ings which travel in a grooved collar O
band screwed to the outersurface O
the hull near the tunnels. On the end
of the screw shell are heavy Hat leathe
rings, which are adapted to engag
three or more threads or flanges on tn
outer radical faces of the collars on tn
nun, together with a sufficient suppl
. OF oil applied from within the hull
secure perfectly smooth running an
: Watertight connection. Secured on TIL
inner surface and at the central por
1on OF the revolving shell are steel rib
or tracks constructed of railroad rail.
The engines are carried within the hu
or body at Its lowest portion. The foo
or the hull Is slotted at the place owe
the tracks to allow the driving wheel
of the engine to engage the track q
ribs. Power then Is transmitted to tn
screw shell friction. This is the prin
ciple of the locomotive and rails re
versed, wherein the engine stands fas
and the rails travel forward or rath
er the principle of the testing plat
form used In almost all of the locomo
tive shops. About the outer surface c