﻿100 Canadian Record of Science. 



provide for this by their perfection of form, as they are 

 bored from their base and liave tlie same proportions, 

 which liave been found to throw the swiftest stream under 

 a given pressure with a hose nozzle. 



It seems probable, in view of the careless use of burners 

 in the ordinary consumption of gas, that one quality of 

 acetylene will tell in its favor. With a suitable Ijurner 

 acetylene will tolerate greater variations of j)ressure than 

 common gas. This point was determined by more than 

 100 measures of the candle power taken with the two 

 gases burning under different pressures. 



The smallness of the acetylene flame required to give 

 off a brilliant light is a point in its favour, allowing the 

 use of a great variety of globes and shades for tempering 

 or reflecting the light. 



The same quality will be found of advantage when a 

 strong light is to be concentrated as nearly as possible 

 at the focus of a mirror or of a lens, as in locomotive 

 headlights or in lanterns for projections. 



It was hoped that the quantity of light given off by 

 duplex or triplex acetylene flames w^ould show a particu- 

 larly economical consumption, but the results of measures 

 of the candle power of such flames with or without chim- 

 neys were disappointing. It appears that defect of air 

 supply with such flames more than counterbalances the 

 effect of the heat which one flame communicates to the 

 other. 



It might be desirable to use the existing gas plants and 

 to deliver, as heretofore, a gas of 20-candle power suitable 

 for heating or lighting. Such a project seemed very easy 

 of fulfilment, since it was at first supposed that acetylene 

 could be used to enrich connnon gas, and in that case no 

 changes would be required in the mode of distribution 

 nor in the form of burners. Experiments have shown 

 that it can be employed to enrich coal gas, but that water 

 gas, which is so largely used in this country, cannot be 



