52Ö

MODERN STEAM PRACTICE.

Angles onSides ofWedge Box.

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Thicknessof Featherin Boss.

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Thicknessat Point ofBlade.

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Thicknessat Root.

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Width atPoint ofBlade.

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Width ofBlade atwidest part.

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Widest partof Bladeabove Boss.

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Thicknessof Cutter.

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Width ofMain Cutter.

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MetalbetweenFlange andtop of Cutter.

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Metal roundShank.

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Diameter ofShank ofBlade.

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Thicknessof Flangeof Blade.

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Diameter ofFlange ofBlade.

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Length ofBoss.

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Diameterof Boss.

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Diameterof Screw.

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Scrcw aperture .—The length of the screw aperture for a mer-cliant ship depends in a great measure on the configuration of thescrew propeller. Dividing the diameter of the screw by 2 - 5 givesample room for the generality of propellers at present in use.

Screw shafting and thrnst collars, pillow blocks, &c .—The pro-peller shaft should have the same diameter as the cranked shaft.The taper of the part for the screw boss should be about inch