CONTENTS.

Admiralty—Mr. Lloyd’s opinion in fa-vour of the superiority of the increasingpitch screw over the uniform pitch screw—the two points in which this superiorityCconsists—obstacle to the introduction ofscrews in the Navy...Tabular particulars of the trials, exhibitingresults in favour of Wooderoft, 30:24—horse power less— results in favour ofSmith, 0:021 greater speed...The author’s screw ordered by the Admiraltyfor the Rattler—evidence of Captain HenrySmith, R.N. of the Rattler, before the PrivyCouncil on the superiority of Wooderoft’s,Screw—-testimony of the chief engineer ofthe Rattler—expiration of the patent—pro-fitless to the author—renewal of the patentagainst the opposition of the Ship PropellerCompany—extract from Lord Brougham’sjudgment on the extension of Wooderoft’spatent.....°The screw of the Rattler the only increasingpitch screw in the Navy, notwithstandingits recognised superiority

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Superiority of Woodcroft’s screw proved byexperiments in the Minx with thirteen dif-ferent propellers— answer to an objection.

Woodcroft’s patent for“ his invention of va-rying at pleasure the angle of screw pro-peller blades with the axis on which theywork, according to the varying circum-stances of wind, current, tonnage, andother conditions affecting the action of themotive power in vessels”.:

Propeller on the improved principle orderedfor H. M. ship Dwarf—description of thispropeller— object of the. varying anglemade by the blades of the screw with theaXis e.....

General object of this screw—extraordinarydelay in trying the screw ordered for theDwarf—reason assigned for the delay

List of patents, nearly all of which are forpropelling vessels, and other documentsrelating to propelling, which the authorhas prepared for publication

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‚A21

‚ 122-140