30, and 31, which we mailfree on applisatlon. S. 0. PORSAITH & CO., Machinists and General Machine Dealers,Manchester, N. H., and 209 Centre St, N. r. City. SCREW PROPULSION.—ABSTRACT OF letiure by Robert Griffiths. The power actually requiredfor propulsion. Experiments on screws. The cause… … Ni:CI<EO SPINDLEAND OIL TJGHT QUSH MUN50N BROTHIIRS {•) \ MflNUl-AC-URERS. /T\ <!f> flNDMILLFUlWIStllNOS. ^?>- UTICftN.Y.U.S.A. LOCOMOTIVES.—PERSPECTIVE AND detail views of the powerful class of locomotives con-structed by the Lehigh Valley Railroad Co., with weightsand dimensions.…
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