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Propellers for Cuba
350
,Mechanics, Physics, and Chemistry.
rinejuices, or other organic fluids. Thus, immediately the neutral fatty matters in the cells of fruits or roots are brought in contact with the ferment which all vegetable substances contain, by breaking the cells in which the fatty matters are deposited, the oil enters into fermentation, and the fatty acids are liberated from the glycerine with which they had been combined. This discovery gives us an insight into the acid'ltv of some oils and the rancidness of others. For the Journal of the Franklin Institute.
Propellers for Cuba. Messrs. Merrick & Sons have recently finished for Don Pedro Lacoste~ of Havana, two steamers built expressly to carry freight and passengers between Cardenas and Havana. Their names are Cardenas and Jtifonso, and their principal dimensions are as follows, viz: Length on deck, Beam, Hold, . . Schooner rigged with three masts.
180 feet. 30 ,' 11 "
Each vessel has 2 vertical cross-head condensing engines placed across the vessel, and driving the propeller shaR by gearing 2~ to 1. Diameter of cylinders, 40 inches; stroke, 3 feet; average revolutions of engines, 32; diameter of propeller, 8 feet 6 inches ; length on shaft, 2 feet ; 4 blades. Average pressure of steam, 25 inches ; throttle open and cutting off at 13 inches from commencement of stroke ; vacuum, 26 inches. Taking the distance from the Navy Yard Shears to Fort Mifflin as 8~ miles, which it is usually called on trial trips, their average speed with and against the tide, light, was 13'43 miles per hour ; and loaded with 340 tons of coal on board, 13 miles per hour--but as the real distance is but 7.13 instead of 8/¢ miles, so the real speed, light, was 11"60 miles, and loaded 11"24 miles. The hulls of these vessels were modeled and built by the Messrs. Cramp, of Kensington, and for beauty of form and excellence of workmanship, would be difficult to surpass. A.
Electro-motive Forces of various Batteries. M. Petruscheski, a Russian experimenter, gives the following as the results of his investigations on the power of different voltaic combinations : Grove,with amalgamated zinc, . 1.78 Battery of cast iron and amalgamated zinc, . Bunsen, . . . . Eisenlohr (Daniell's, with tartrate of potassa in place of sulphurie acid), Dan,lell, with chloride of sodium, . . chloride of sodium and amalgamated zinc, " with dilute sulphurie acid, Eisenlohr, with zinc not amalgamated, Daniell, dilute suiphuric acid and amalgamated zinc, Wallaston, with amalgamated zinc,
1.72 1.69 1.05 1.05 1.01 1'00 0.99 093 0.93
Cosmos, vol. xii., p. 4.
,Mechanics, Physics, and Chemistry.
rinejuices, or other organic fluids. Thus, immediately the neutral fatty matters in the cells of fruits or roots are brought in contact with the ferment which all vegetable substances contain, by breaking the cells in which the fatty matters are deposited, the oil enters into fermentation, and the fatty acids are liberated from the glycerine with which they had been combined. This discovery gives us an insight into the acid'ltv of some oils and the rancidness of others. For the Journal of the Franklin Institute.
Propellers for Cuba. Messrs. Merrick & Sons have recently finished for Don Pedro Lacoste~ of Havana, two steamers built expressly to carry freight and passengers between Cardenas and Havana. Their names are Cardenas and Jtifonso, and their principal dimensions are as follows, viz: Length on deck, Beam, Hold, . . Schooner rigged with three masts.
180 feet. 30 ,' 11 "
Each vessel has 2 vertical cross-head condensing engines placed across the vessel, and driving the propeller shaR by gearing 2~ to 1. Diameter of cylinders, 40 inches; stroke, 3 feet; average revolutions of engines, 32; diameter of propeller, 8 feet 6 inches ; length on shaft, 2 feet ; 4 blades. Average pressure of steam, 25 inches ; throttle open and cutting off at 13 inches from commencement of stroke ; vacuum, 26 inches. Taking the distance from the Navy Yard Shears to Fort Mifflin as 8~ miles, which it is usually called on trial trips, their average speed with and against the tide, light, was 13'43 miles per hour ; and loaded with 340 tons of coal on board, 13 miles per hour--but as the real distance is but 7.13 instead of 8/¢ miles, so the real speed, light, was 11"60 miles, and loaded 11"24 miles. The hulls of these vessels were modeled and built by the Messrs. Cramp, of Kensington, and for beauty of form and excellence of workmanship, would be difficult to surpass. A.
Electro-motive Forces of various Batteries. M. Petruscheski, a Russian experimenter, gives the following as the results of his investigations on the power of different voltaic combinations : Grove,with amalgamated zinc, . 1.78 Battery of cast iron and amalgamated zinc, . Bunsen, . . . . Eisenlohr (Daniell's, with tartrate of potassa in place of sulphurie acid), Dan,lell, with chloride of sodium, . . chloride of sodium and amalgamated zinc, " with dilute sulphurie acid, Eisenlohr, with zinc not amalgamated, Daniell, dilute suiphuric acid and amalgamated zinc, Wallaston, with amalgamated zinc,
1.72 1.69 1.05 1.05 1.01 1'00 0.99 093 0.93
Cosmos, vol. xii., p. 4.