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Julius Nelson Ellis
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Publication of GB190813511ApublicationCriticalpatent/GB190813511A/en
13,511. Ellis, J. N. June 27, 1907, [date applied for under Section 91 of Patents &c. Act, 1907]. Screw propellers of the type in which the blades are surrounded by a circumferential r i n g are provided with helical blades 10, the leading and trailing edges 11, 13 of which are concave. The blades may be graduated in pitch from the axis to the outer edge.
GB190813511D1907-06-271908-06-25Improvements in Screw Propellers for Marine Vessels.
ExpiredGB190813511A
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