The Manning times. [volume] (Manning, Clarendon County, S.C.) 1884-current, 1888-11-14
DOUBLE END PROPELuERS.
Theories That Ste;.::..rs Should be b"ii'
With 4 Screw in the Bow and Stern.

Theories That Ste..::..rs Should be BuliI
With 4 Screw in the Bow and Stern.
Theories have been recently ADVANCED 10y
naval architects sn.l engineers to the ctlcc'
that steamers should be built with 4 pro
pelier in the bow as we'll rs in the stern rt
Inc vessel. y ferry boat IS nov hcinS bui!l
in New York - demonstrate tiIt these
theories are praaiic.:hl" Il tGok Howe ten
years to discover that II order 10 make :;
sewing machine i i,eedI" must bc lhrea,!c"
at the point instead of The oth~r ED, as,t
the arguments in favor Of the propeller II
the bow oi q steamer are parallels With tie
sewing machine discovery.
l: hiss been claimed that the action o:
Two wheels. one IN the bow and one IL III;
stern. is this: The forward wheel screws
Itself into the solid wafer lhe,d ol the ho
,.nG throws ;.>tern the quantity OF water !
las hi; i'll the revolution, which action. i
is said, draws the boat ahead. The currer:
flows aft ard there comes in contact With
The stern screw, which is at the same time
pushing the boat ahead William Cowies,
= New York naval architect, IN q paper
which he read before the American Society
OF Mechanical Engineers, said that the
screw in the bow of the boat has becp
proved by use 10 be more efficient in pro
peling than screw ct the stern.
Charles H. Cramp, whose firm is build
ing several ships of the new navy. said last
night, when asked what he thought about
the bow propeller theory:
'tIt has not been proved by use that the
screw in the bow of the boat is more eth
cient in propelling than a screw at the
stern. So far the propeller in the bow OF
steamer is only a theory. There may be
good deal in the theory, and it is matter
would have 20 give careful thought be
fore condemning If, however, as think
now, TWO boats were built, one with two
propellers in the stern and the other boat
with a propelie. u TIC Stern and one IN tie
bow, think would take the boat with
the two propellers in the stern as the quick
est, safest and most powerful. l do moi
believe that warships. built with propellcrs
in the bow, would be any better than those
built with only propellers in the stern, bu
as I said before, there is a good deal il
the theory, aud | would have to euler into
the technicalities of ship, building before
would care to express myself empnatically
as to whether the theory admits Of practl
cablity.
so lar as the propeller IL the Dow ap
plies to tugs and boats for use in the Della
ware river or in New York harbor l say
that the propeller in the bow would be :;
failure on account of ice, which woulc
break the blades of the screw. No screw
could stand coming in contact with BIZ
cakes of ice. BY having the propeller lc
Gated in the bow of the boat the screw IS s
matter of course would have to ploW
through the ice, whereas with the screw i,
the stern it is different. The PROV of tht
boat has separated the ice before the screw
in the stern comes in contact with it. It i:
all very nice to theorize, but until | saw
the practical working of a screw IL the bow
of the boat and saw that ii was an improve
ment over the screw in the stern | would
have to decide in favor of the screw
in the stern:"-Philadelphia Times Nov. 6