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Screens for carding engines
~88
Mechanics, _Physics, and Chemistry.
The machine besides setting 1000 m's fewer in an hour than six compositors, will cost a considerable sum, and the price of the apparatus, its wear, and its great liability to get out of order, are not taken into the account, which certainly should have been done. Cincinnati, October, 1844. T.L.
]'011 T I I E f f 0 U R N X L OF T H E ~ R A I q K L I ~
II~STITUTE.
Screens for Carding Engines. B y page 102 of the February number of the Journal of the Franklin Institute, I observe that letters patent of the United States, have issued to Joseph Munroe, of Hampden county, Massachusetts, for
"the application to carding machines of a screen which will permit the dirt, motes, ~c., to escape without the cotton and wool, as described." The screen referred to, is, beyond doubt, a very useful appendage to a carding engine, and though it may have been original with Mr. Munroe, it may not be uninteresting to the public to know, that this identical contrivance has been in use at the Rockland Cotton Mills, on the Brandywine, near Wilmington, Delaware, ever since the year 1828, and, though it was not original with us, we can bear testimony to its great utility. Rockland, Delaware. W. WALLACE You~o.
Process for Preparing the Purple Powder of Cassius. M. Figuier gives the following as a certain process for preparing the above named compound :--dissolve 800 grains of gold in five times their weight of aqua regia, prepared from four parts of hydrochloric acid, and one part of nitric acid ; evaporate the solution almost to dryness; this evaporation is requisite to get rid of the acid. The chloride of gold beitJg redissolved in water and filtered, the solution is to be diluted till it measures 26 ounces ; fragments of granulated tin are then to be put into it, which becomes turbid and brown in a ~ few minutes; its tint gradually becomes deeper, and at the end of a quarter of an hour it assumes a fine purple color, the precipitate is deposited, and it remains only to collect it on a filter. It sometimes happens, and especially when large quantities are operated on, that tbe precipitate does not separate, but remains in the liquid, to which it gives a deep purple color ; in this case it is merely requisite to heat the liquid slightly, and to add a little common salt; the product then immediately separates. When the liquid holding the purple powder in suspension is decanted to separate the excess of metallic tin, care must be taken that no particles of tin, which remain at the bottom of the vessel in the 8rate of a black powder, are poured off with it ; it is proper to allow the liquor to settle for some time, and afterwards to decant it ; this ration should be repeated three or four times.--,//nn, de Ch. et de 8., Juillet, 1844. Load. Edin. and Dublin Phil. Mag.
Mechanics, _Physics, and Chemistry.
The machine besides setting 1000 m's fewer in an hour than six compositors, will cost a considerable sum, and the price of the apparatus, its wear, and its great liability to get out of order, are not taken into the account, which certainly should have been done. Cincinnati, October, 1844. T.L.
]'011 T I I E f f 0 U R N X L OF T H E ~ R A I q K L I ~
II~STITUTE.
Screens for Carding Engines. B y page 102 of the February number of the Journal of the Franklin Institute, I observe that letters patent of the United States, have issued to Joseph Munroe, of Hampden county, Massachusetts, for
"the application to carding machines of a screen which will permit the dirt, motes, ~c., to escape without the cotton and wool, as described." The screen referred to, is, beyond doubt, a very useful appendage to a carding engine, and though it may have been original with Mr. Munroe, it may not be uninteresting to the public to know, that this identical contrivance has been in use at the Rockland Cotton Mills, on the Brandywine, near Wilmington, Delaware, ever since the year 1828, and, though it was not original with us, we can bear testimony to its great utility. Rockland, Delaware. W. WALLACE You~o.
Process for Preparing the Purple Powder of Cassius. M. Figuier gives the following as a certain process for preparing the above named compound :--dissolve 800 grains of gold in five times their weight of aqua regia, prepared from four parts of hydrochloric acid, and one part of nitric acid ; evaporate the solution almost to dryness; this evaporation is requisite to get rid of the acid. The chloride of gold beitJg redissolved in water and filtered, the solution is to be diluted till it measures 26 ounces ; fragments of granulated tin are then to be put into it, which becomes turbid and brown in a ~ few minutes; its tint gradually becomes deeper, and at the end of a quarter of an hour it assumes a fine purple color, the precipitate is deposited, and it remains only to collect it on a filter. It sometimes happens, and especially when large quantities are operated on, that tbe precipitate does not separate, but remains in the liquid, to which it gives a deep purple color ; in this case it is merely requisite to heat the liquid slightly, and to add a little common salt; the product then immediately separates. When the liquid holding the purple powder in suspension is decanted to separate the excess of metallic tin, care must be taken that no particles of tin, which remain at the bottom of the vessel in the 8rate of a black powder, are poured off with it ; it is proper to allow the liquor to settle for some time, and afterwards to decant it ; this ration should be repeated three or four times.--,//nn, de Ch. et de 8., Juillet, 1844. Load. Edin. and Dublin Phil. Mag.