tTHE ADVOCATE OF INDUSTRY AND JOURNAL OF SCIENTIFIC MECHANICAL AND OTHER EPIIPROVEMENTS. [NUMBER 31. NEW-YORK APRIL 19 1851. THE Scientific American CIRCULATION 16000. PUBLISHED WEEKLY 13 Court street Boston Mass. BY MUNN & COMPANY The Principal Office being at New York. A. T. Hotchkiss Boston. Dexter & Bro. New York City. Weld & Co. New Orleans. Stokes & Bro. Philadelphia. Cooke & LeCount San Francisc Cal. Courtenay & Wienges Charleston S. C. John Carruthers Savannah Ga. Barlow Payne & Parken London. Responsible Agents may also be found in all the principal cities and towns in the United
tTHE ADVOCATE OF INDUSTRY AND JOURNAL OF SCIENTIFIC MECHANICAL AND OTHER EPIIPROVEMENTS. [NUMBER 31. NEW-YORK APRIL 19 1851. THE Scientific American CIRCULATION 16000. PUBLISHED WEEKLY 13 Court street Boston Mass. BY MUNN & COMPANY The Principal Office being at New York. A. T. Hotchkiss Boston. Dexter & Bro. New York City. Weld & Co. New Orleans. Stokes & Bro. Philadelphia. Cooke & LeCount San Francisc Cal. Courtenay & Wienges Charleston S. C. John Carruthers Savannah Ga. Barlow Payne & Parken London. Responsible Agents may also be found in all the principal cities and towns in the United States. TERMS$2 a-year—Si in advance and the remainder in 6 months. GREGORY'S ENGINE POWER-REGULATORFig. 1. VOLUME 6. lairlinatrAnn. This novel device is the invention of Mr. Alfred Gregory of Brooklyn N. Y. who has Of its practical utility and highly important advantages we feel convinced and our opinion coincides with that of several well-known en gineers among whom are Messrs. Stillman Allen & Co. of the Novelty Works in this city whose written acknowledgment of its me rits we have seen. The object of the invention is to render more generally available both in marine and land engines a large expansion of the steam which may by the adoption of this plan (ap plicable at a small cost to engines now in use) be ' cut-off ' much earlier in the ' stroke' than is by the present means practicable. The economy in fuel which ensues by cutting off steam in the cylinder has long been es tablished which economy is still greater when steam of ' high pressure' is employed and is dependent upon the period of ' cut-off' even with ' low pressure' in the following propor tions—steam stopped at one half of the stroke has its performance multiplied one and three quarter times ; at one quarter of the FIG. 2. German Railroads. Germany began to experience the luxury and benefit of fast and comfortable riding in the year 1848 by constructing the railroad of which eighty miles (more than 360 English m
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