The Ely miner. [volume] (Ely, Minn.) 1895-1986, 1916-10-27

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Griffin, chief OF the bureau of steam engineering,
according to writer in the New York Sun.
These engines, which will be Of the electricdrive
type, are expected to push the 9OO-foot ships
Through rough seas at speed approaching IS
Knots; that is, about four knots better than the
latest United States destroyers and at the rate
of passenger train running on a carefully
graded road.
When Admiral Griffin tells the story one gains
from his manner the impression that about all
he had to do was to speak to Captain Dyson
about it and the design Of these 100000 en-
gnes sprang into existence but those who know
the admiral have their own opinion about that /:
and 1t differs somewhat radically from the i'm
preston.
EYES," said the chief, sat first it was rather
appalling when we realized the magnitude of those
engines. The largest in any Of our battleships
give 25,OOO horse power; those Of the Lusitania
were 10000; and 1t is said that those which drive
the English Tiger at about 80 knots are from 3d.
600 to 10000. So can see that we had to
make leap, and at first 1t seemed like a leap in
the dark, to provide approximately 200 900 horse
power. But somehow, when we got the conditions
right before us, everything seemed to unfold
itself and fall into the right place and there really
was little difficulty.
1--WE saw at the outset that it was impossible
TO control and apply the power without adopting
oil fuel and the electric drive In the great
mercantile ships like the Aquitania and the
Vaterland we had examples of the 9OOLfoot
boats with speed of 25 or &c knots but It is
the last few knots which are so difficult to get
Very roughly speaking, the new cruisers steam
ing at Is knots will consume the equivalent of
15O tons Of coal day. and to attain somewhere
between "a and 35 knots will burn up the same
Nuantity in one hour; to put 1t another way the
coal required to drive one of these cruisers Mt
full speed for day will drive battleship across
the Atlantic and back. If full speed can be MAIN
davc nd
IT will take one from New York to Liverpool but
as that would require 600 tons of coal It Is
certain that such a run will never be attempted
on coal fuel.
mo one can tell what the chemistengneer of
the future will do; but until something is found
battle cruisers will have to depend upon oil to
convert water into steam; and without that SUBJ
stitute they cannot be driven many consecutive
hours at full speed. It would not be possible to
transmit so much power one shaft or one
screw. Therefore 1t Is distributed to four shafts
each receiving about $4,000 horse power or dou-
BILE the total power in superdreadnaught and
greater than that Of any but the largest of the
modern merchantmen.
eff only low moderate rate Of speed were
required the old-style reciprocating engines
would, because more economical probably be Sc
aected but to secure the high rates turbines will
be adopted.
"The electric drive Is not difficult to compre-
hend If will think Of the familiar trolley sub
way railway car driven by electricity The
power is created by the operation of steam-driven
generators or dynamos. They produce the cleo
tric current which is carried by wire to the many
small motors in the cars scattered along the sys-
tenn. The motorman or engineer turns on the
power and the motor is driven ahead he moves
his lever and the power is shut off he shoves 1t
farther over and reverses his motor For many
small motors say several large ones and you have
the plan of the ships electric drive. The turbines
30 %Hn ,&o-n A.
tors, and the motors turn each Of the four pro-
peller shafts of the ship.