By simply fixing the propeller to the prolonged motor shaft, we complete
the whole system, which, when correctly made, will do its duty in
perfect order, with an efficiency approaching theory to a high degree.
[Illustration: FIG. 1.--RECKENZAUN'S ELECTRICAL HORSE POWER DIAGRAM.
Draw a square, A B C D--divide B C into 746 parts, and C D into 1,000
parts, or, generally, let a division on C D be 0.746 of a division on B
C, so that we can use the horizontal lines cutting A B as a horse power
scale. A B, in the above diagram, gives 1,000 horse power, if the line
B C represents 746 volts, and C D 1,000 amperes. Let x = any number of
volts, y the amperes, and h the horse power, then
h/x = y/100 :. h = xy/746
A fine wire or thread stretched from o as a center to the required
division on C D will facilitate references.]
Whatever force may be imparted to the water by a propeller, such force
can be resolved into two elements, one of which is parallel, and the
other in a plane at right angles to the keel.
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