Propeller Page: 4 of 4
This patent is part of the collection entitled: Texas Patents and was provided to The Portal to Texas History by the UNT Libraries Government Documents Department.
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The following text was automatically extracted from the image on this page using optical character recognition software:
through adjacent to the hub and between
the blades. Therefore I provide an air tube
25, preferably located at the bow, and ex-
tending, as shown in Fig. 5, to the keel and
5 a short distance along the same. The lower
end of the tube is preferably flaring, as at
26. When the vessel is advanced as under
the action of the propeller, air will be drawn
down through the tube 25 and discharged
io at the keel 26, and pass along the vessel at
the keel to the propeller. The air reduces
the friction on the vessel and prevents a
vacuum being formed in front of the pro-
peller blade.
15 Having thus described my invention, I
claim as new and desire to secure by Letters
Patent:
1. A propeller having blades at angles to
each other and to the axis of the propeller,
20 the blades presenting planes having tran-
secting base lines meeting at the median line
of the hub of the propeller, said base lines
extending laterally across the axis of the
hub, the sides of the propeller rising ap-
25 proximately - perpendicular to the said
median base line.
2. A propeller having blades at angles
to each other and to the axis of the pro-
peller, the blades presenting planes havingtransecting base lines meeting at the median 30
line of the hub of the propeller, said base
lines extending laterally across the axis of
the hub, the sides of the propeller rising ap-
proximately perpendicular to the said me-
dian base line, and the blades furthermore 35
having rearwardly disposed flange mem-
bers in parallel horizontal planes and ex-
tending rearwardly from the upper edges
of the blades.
3. A propeller having substantially rec- 40
tangular blades. disposed in transecting
planes that meet at the median line of the
hub of the propeller, said base lines extend-
ing laterally across the axis of the hub,
the blades having parallel horizontal flanges 45
integral with the outer edges of the blades
and approximately of the same area as the
blades, the said blades at the back tapering
toward the side edges and the flanges taper-
ing on the outer sides toward both the sides 50
and the rear edge.
In testimony whereof I have signed my
name to this specification in the presence of
two subscribing witnesses.
DAVID H.. BLAKE.
Witnesses:
J. L. McAULIFFE,
JOHN P. DAvIs.Copies of this patent may be obtained for five cents each, by addressing the " Commissioner of Patents,
Washington, D. C."2
1,433,662
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Reference the current page of this Patent.
Blake, David H. Propeller, patent, July 23, 1912; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth515030/m1/4/?q=%22%22~1: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.