L. MECHANICS AND ENGINEERING. 489 



passing gas of 14.91 candles rapidly through a tube heated 

 to dull redness, the illuminating power was found to be 15.1 

 candles, and when the gas was passed through a tube heated 

 to bright redness, the illuminating power was increased to 

 16.66 candles. 16 A, July, 1872, 396. 



INSTANTANEOUS GALVANIC LAMP-LIGHTER. 



Dr. Klinkerfues, of Gottingen, Hanover, has invented what 

 lie calls a hydrostatic instantaneous galvanic lamp-lighter, 

 and tried it on about forty street lamps. The experiment 

 was entirely successful, and a general introduction of the ap- 

 paratus is confidently anticipated. 14 (7, vol. cciv. 



OXYGEN ILLUMINATION. 



According to the Philadelphia Ledger, a committee of the 

 Paris Society of Civil Engineers has reported that, theoretic- 

 ally, the combustion in a receiver filled with oxygen dees 

 not increase the illuminating power of a given volume of gas, 

 but that, practically, it enables a burner to consume four 

 times the quantity of ordinary gas that can be burned in air, 

 and also develops the entire luminous capacity of common 

 gases. The increased beauty of the light the only advan- 

 tage it is reported, is more than counterbalanced by the cost 

 of the complicated apparatus. Philadelphia Ledger. 



MANUFACTURE OF PURE WROUGHT IRON. 



It has generally been considered impossible to make pure 

 wrought iron ; but the Mechanics' Magazine informs us that 

 this has been in fact accomplished at the Bowling Iron Works, 

 Bradford, by the Henderson process. The wrought iron ob- 

 tained by direct analysis shows 99.5 per cent, of pure iron, 

 the barest trace of sulphur, and 0.27 of carbon; and not the 

 slightest indication of silicon, phosphorus, or manganese, 

 though all these substances were found in the pig iron em- 

 ployed. 



dormoy's puddling apparatus. 



The apparatus for puddling by machinery, invented by Mr. 

 Dank, has attracted a great deal of attention in England, 

 and numerous forges have been fitted up with his apparatus. 

 Less expensive arrangements have, however, been lately de- 



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