218 SEC. 8. UKAT. 



cast steel iu 25 minutes. The highest temperature obtained is 9,000 Fahren- 

 heit. Although a foot Mower is used, it must not be classed as a furnace, for 

 the air supply required is very small. Owing to the great heating power of 

 London gas, furnaces stated to give certain results are not verified elsewhere. 



988. Low Temperature Gas Burner, to dispense with 

 drying closets, sand and water baths, and adapted for drying, 

 evaporating, boiling, &c. Thomas Fletcher. 



This burner gives a range of temperature from a gentle current of warm air 

 without visible flame to clear red heat, and is so perfectly under control that 

 a common glass bottle may be placed on tripod, and heated to required 

 temperature, without risk of fracture. 



For very low temperatures, the ring must be lighted "through the lowest 

 opening. This gives a steady current of heated air through the gauze above. 

 For boiling, &c., a light must be applied on the surface of the gauze, thereby 

 providing a large body of blue flame, which can be urged by the blast-pipe 

 until it gives a clear red heat. 



989. Hot Blast Blowpipe, for temperatures up to the 

 fusion of platinum. Thomas Fletcher. 



The air jet in the above is coiled round the gas pipe in a spiral form, and 

 both are heated by three Bunsen burners underneath, which are controlled 

 by a separate tap. By this arrangement the power is double that of the 

 ordinary blow-pipe. When the jet is turned down to a small point of flaine 

 it will readily fuse moderately thick platinum wire. 



990. Gas Crucible Furnace, for temperatures up to white 

 heat, and requiring neither blast nor attention. Thomas Fletcher. 



991. Gas Muffle Furnace, requiring neither blast nor 

 attention ; for temperatures up to fusing point of cast iron. 



Thomas Fletcher. 



992. Diagram of the Porcelain Furnace at Sevres. 



Part of it being open to show the interior construction. Painted 

 by Mr. Hubertus Sattler. 



Dr. Alexander Bauer, Professor, Polytechnic Institute, 

 Vienna. 



993. Diagram of the Bottom of a Blast Furnace for 

 Smelting Iron. 



Dr. Alexander Bauer, Professor, Polytechnic Institute, 

 Vienna. 



994. Government Safety Magazine Lamp. 



J. Gardner 3? Sons. 



Designed, by request of the Home Office, to burn in gunpowder magazines 

 and other dangerous places in perfect safety, and to exclude the powder which 

 is found floating in magazines and stores in the form of fine dust, allowing it 

 to collect inside tl:e lamp and explode, the explosion penetrating the gauze, 



