Year: 1887

page_text: I, JONATHAN SHERMAN, of North Waterford, in the County of Waldo, and State
of Maine, one of the United States of America, Farmer, do hereby declare the nature
of this invention to be as follows:-
This my invention relates to certain new and useful improvements in screw propellers
for, navigable vessels; and which invention has for its object to make a screw
propeller more effective than those at present in use.
My said invention consists essentially of two rectangular metal plates which are
bent lengthwise to an ogee or cyma form and which are fixed in any suitable way
to an arm, consisting of a piece of metal, preferably sheet metal which is suitably
attached to a boss or head in any suitable way.
The said arm is bent or twisted until the pitch of the cyma shaped pieces of metal
is determined.
An alternative form of my said invention consists in attaching the cyma shaped
blades to arms which are made of bar iron which are bent in such a manner that the
blades lie at, or nearly at right angles to the said arms.
When my improved screw propeller is revolved in one direction it will advance
the vessel, and when revolved in the opposite direction it will recede the said vessel.
Dated this 22nd day of October 1887.
•
HORN & SON,
Applicant's Agents.

page_text: I, JONATHAN SHERMAN, of North Waterford, in the County of Waldo, and State
of Maine, one of the United States of America, Farmer, do hereby declare the
nature of this invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This my invention relates to certain new and useful improvements in screw propellers
for navigable vessels; and which invention has for its object to make a screw propeller
more effective than those at present in use.
I now proceed to describe my said invention, reference being had to the accom-
panying drawings, and the figures and letters of reference marked thereon, similar
letters refering to like parts throughout.
Fig. 1 is a perspective view of my invention. Fig. 2 is a top view of Fig. 1, and
Fig. 3 is a perspective view of an alternative form of my invention.
My invention consists essentially of two rectangular metal plates A, A, which are
bent lengthwise to an ogee or cyma form as represented, and which are fixed in any
suitable way to an arm B, consisting of a piece of sheet metal and suitably attached
to the boss or head C, preferably as shewn in Fig. 2. The said arm B is bent or
twisted as shewn for the purpose of increasing the pitch of the screw.
An alternative form of my said invention consists in making the screw propeller
with arms E (Fig. 3) which are attached to the boss or head in any suitable way,
and which are bent lengthwise in the manner represented.
The blades A, by having the arms E attached to them at their central parts, stand
with their surfaces at or about at right angles to the arms both lengthwise and
transversely of the said blades.
When my improved screw propeller is revolved in one direction when immersed in
water and extended from the stern of the hull of a navigable vessel, and applied to a
revoluble shaft, as screw propellers usually are, it will advance the vessel; but on
being revolved the opposite way it will effect a backward movement of such vessel.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
1st. In a screw propeller, the blades A bent to an ogee or cyma form and suitably
attached to an arm B, said arm B being bent or twisted as shown, and attached in
any suitable way to the boss or head Call substantially as and for the purposes,set
forth.
2nd. In a screw propeller, the blades A bent into an ogee or cyma form and attached
in any suitable way to arms E, said arms E being bent lengthwise as shewn and
attached to the boss or head C in any suitable manner, all substantially as, and for
the purposes hereinbefore described, set forth in the claim, and fully illustrated in the
drawings hereunto annexed.
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