359 such as rough cast iron smooth cast iron wood etc. be has not informed us of their position their nature LETTERS FROM THE PEOPLE. PETROLEITM FOR STEAM SHIPS. economical than coal. Now the substance that gen erates in burning more heat than any other is hydro gen gas and a pound of this will raise the tempera ture one degree of' only 34462 lbs. of water. We find no record of direct experiments upon the Count Rumford and these gave a result of about THE ART nv 'qERVATION. that whoever enters the field of original research in and will receive new lessons in relation to the impor ness in making observations. THE -s MUNN et COMPANY. Editors d; Proprietors. Contents : LEATHER BANDS., scientific american, 1865-06-03
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