MARINE ENGINES . 379 and whose full propelling area is only attained when the arms to which they are bolted are vertical Thus when fixed the floats depress the water on entering , and tend to lift it when leaving , and … S ’ S ' S « SJV - " s . 2P to obviate this difficulty each float was formerly stepped , or made in two or more separate pieces , placed one before another . This plan , however , is now become almost obsolete ; the feathering floats , although somewhat complicated , being generally adopted for all
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