surplus should be invariably poured bad 

 is closed. 



Mr. S. Highley used to insist on the 

 ing a double flat wick turned edgeways to the 

 or cut nearly to the slant of the latter, and the 

 separated, so that the oxygen blew up a little slanting trougn* 

 of wick. I was never convinced of the benefit of this, and the 

 ordinary jet is good enough for any of the places where it is 

 ever used. 



I do, however, believe that gain follows the adoption of 

 Lieut. Drummond's original form of lime. He always used a 

 small spherical ball, about f inch in diameter, supported on 

 a platinum wire. Heat is wasted on a large mass, which is 

 utilised in incandescence when concentrated on a smaller frag- 

 ment ; and the small balls will bear very well for the requisite 

 time the action of this weakest form of the lime-light. 



What are called soft limes give the best light, and with 

 average jets this may be taken as equal to about 120 standard 

 candles. It is rarely less than 100, and I have known it coaxed 

 to nearly 150 candles. 



For the use of this jet with two lanterns, see Dissolving 

 Views, 56. 



27. The Oxy-gas Jet This is often called the ' oxy-cal- 

 cium 'jet, and also the ' safety ' jet, or the ' blow- through ' 

 jet. None of these names are distinctive, and I prefer that 

 chosen, as indicating that 

 oxygen is used with * gas ' 

 from the ordinary meter 

 supply. 



The flow of house gas 

 must be pretty free, and 

 it seldom answers simply 



to slip the end of a rubber tube over the nipple of a common 

 burner. In many halls there is a nozzle provided somewhere, 

 specially for such purposes. If not, the nipple of a burner 



FiG. 29. Gas Nozzles 



