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Artificial stone
13"2
East h~dian Iron.* We are glad to be able to add to our former good reports of the mannfacture of li;iist Indian iron. There will very shortly be five furnaees at workatBeyp0ie. The ores of' Malabar have proved as traetablein lhe smeltir!g pm(ess as those ,,f Salem ; and the produce has quite sustained the e~p~;'i ~tion of the Board, whether as regards the yield or the qualit) of file: ir01~ for forge_ o tbu adry, t3U'lmses,~. In proof of this, during tbnr weeks of the month of January last, 13'5 tons of pigs of an excellent quality we!e yielt!ed at ~eypore by 216 tons of ore and 209 tons of charcoal tue:q, l n o t h e r words, about 3"2 ewt. of ore, and 3"2 cwt. of fuel, eosling not more lhan 5s. 3(1. and 18s. 6(I. per ton respectively, according to the , C o s t Aleet " fmnished, have been found su~ticient lo make a ton of" pig itOli:, file expenditure on aecount of labor at the furnace being at the same time at the rate of Ss. lOd. per ton of pig. The Madras railway from Beypore is progressing with great rapidity ; and the company has contr~',c ed tbr all the wrought and cast iron work of the Beypore statiom i
~rlificial Stone. Chalk, e;iherin the lump, or reduced to a paste, and steeped in a solution of silicate ~f potash, absorbs a considerable quantity of silica. It acquires a Sinootl appearance, elose grain, and yellow color. The stone thus prepa!!ed ta~es a very fine polish, and hardens by degrees from the surface to the int~yior. This process may be advantageously employed for making mouhiings, delicate sculptured ornaments, &e. Ancient mom<~ents of calcareous stone may be preserved by washing with silic~,!e of pi~tash. White limestones are silicated with double silicate of potash an~ manganese. When the stones are too (lark, excellent results are obtai~ed by suspending in the silicate a little sulphate of baryta, which pe?etrates into the porous stone along with the silica, and remains there itla state of combination. The joinings may be concealed by fragments ~f the stone ground up to powder, mixed with the silicate of potash~ and applied as a paste.
On WorltiN Slea~ Expansivebl in J~larineEngines. By Mr. lg. A. Ar.LW~r, of London.~ § It is proposed in the present paper to consider the practical or eommereial advantag!~s of working steam expansively in the marine engine, as distinguished t'~'om the theoretical advantages, which latter are better understood and hi,ore generally admitted. It has been est',iblished theoretically, that eonslderable economy is oblainable by worldng steam expansively. Thus--if steam be allowed to * Lond Practical ~iechanies' Journal, October, 1855. "I"From the L0nd,~ii Artizan, Sept., 1855. Prom the Lmtil;:Mcchanies' Mag., July, 1855. '~ The subgtance o1:a paper read at the last Meeting of the Institution of Mechanical Engineers, t3~rmingh~m.
East h~dian Iron.* We are glad to be able to add to our former good reports of the mannfacture of li;iist Indian iron. There will very shortly be five furnaees at workatBeyp0ie. The ores of' Malabar have proved as traetablein lhe smeltir!g pm(ess as those ,,f Salem ; and the produce has quite sustained the e~p~;'i ~tion of the Board, whether as regards the yield or the qualit) of file: ir01~ for forge_ o tbu adry, t3U'lmses,~. In proof of this, during tbnr weeks of the month of January last, 13'5 tons of pigs of an excellent quality we!e yielt!ed at ~eypore by 216 tons of ore and 209 tons of charcoal tue:q, l n o t h e r words, about 3"2 ewt. of ore, and 3"2 cwt. of fuel, eosling not more lhan 5s. 3(1. and 18s. 6(I. per ton respectively, according to the , C o s t Aleet " fmnished, have been found su~ticient lo make a ton of" pig itOli:, file expenditure on aecount of labor at the furnace being at the same time at the rate of Ss. lOd. per ton of pig. The Madras railway from Beypore is progressing with great rapidity ; and the company has contr~',c ed tbr all the wrought and cast iron work of the Beypore statiom i
~rlificial Stone. Chalk, e;iherin the lump, or reduced to a paste, and steeped in a solution of silicate ~f potash, absorbs a considerable quantity of silica. It acquires a Sinootl appearance, elose grain, and yellow color. The stone thus prepa!!ed ta~es a very fine polish, and hardens by degrees from the surface to the int~yior. This process may be advantageously employed for making mouhiings, delicate sculptured ornaments, &e. Ancient mom<~ents of calcareous stone may be preserved by washing with silic~,!e of pi~tash. White limestones are silicated with double silicate of potash an~ manganese. When the stones are too (lark, excellent results are obtai~ed by suspending in the silicate a little sulphate of baryta, which pe?etrates into the porous stone along with the silica, and remains there itla state of combination. The joinings may be concealed by fragments ~f the stone ground up to powder, mixed with the silicate of potash~ and applied as a paste.
On WorltiN Slea~ Expansivebl in J~larineEngines. By Mr. lg. A. Ar.LW~r, of London.~ § It is proposed in the present paper to consider the practical or eommereial advantag!~s of working steam expansively in the marine engine, as distinguished t'~'om the theoretical advantages, which latter are better understood and hi,ore generally admitted. It has been est',iblished theoretically, that eonslderable economy is oblainable by worldng steam expansively. Thus--if steam be allowed to * Lond Practical ~iechanies' Journal, October, 1855. "I"From the L0nd,~ii Artizan, Sept., 1855. Prom the Lmtil;:Mcchanies' Mag., July, 1855. '~ The subgtance o1:a paper read at the last Meeting of the Institution of Mechanical Engineers, t3~rmingh~m.