Defcription of a new Gas-holder. 1^3 



or>fervations, and combining them in various ways to obtain 

 their remits, its progrefs may be (till accelerated. The ufeful 

 purpofes which may be thereby anfwered in philofophy, agri- 

 culture, and medicine, may be properly urged to obfervers 

 as the means of fupporting their ardour, and indemnifying 

 them for thofe farcafms and reflections which even fome 

 learned men have been pleafed to beftow upon obft* rvations 

 of this fort, together with their authors. (See my Confi- 

 derations on Meteorology, Journal de Phyftaue 1801, t, lii. 



P . 388.) 



XXVI. Defcription of a new Gas-holder. By W. H. 

 Pjsprs jun.* 



T, 



II E combuftion and deflagration of inflammable fuh- 

 ftances, metals, and various compounds in oxygen gas, form 

 fome of the moft beautiful and interefting experiments in 

 modern chemiftry. The intenfe fplendour of the liberated 

 light and the variety of its colours aftonifh the fpectator, and 

 become a pleafing addition to our rational amufements, while 

 the experiments ferve at the fame time to elucidate fome of 

 the great laws of nature. 



Many people, however, have complained that, notwith- 

 standing the fimplicity to which the apparatus for fuch ex- 

 periments has been reduced, fomething was flill deferable to 

 enable thofe who have not had many opportunities of ac- 

 quiring habits of experimenting to enjoy this interefting fci- 

 ence without the inconvenience of being obliged to ufe a 

 pneumatic ciftern for the purpofe of transferring the gas. 

 To accommodate fome friends of this defcription, I contrived 

 a gas-holder, which not only obviates the above inconveni- 

 ence, but is capable of being emploved to tranfport the gas 

 from place to place, and to preferve It from being contami- 

 nated, and of being ufed for experiments with the blowpipe. 



This apparatus is in fome refpe&s fimilar to that recom- 

 mended by Mr. Watt. A fmall circular ciftern is added at 

 top, which is connected with the gas-holder by means of 

 two pipes furnitlied with cocks. It has alfo a brafs cock on 

 the fide, and a glafs gage or regifter tube (bowing the quan- 

 tity of included gas bv the level of the water. The follow- 

 ing is a defcription of the different parts : 



The gas-holder G (Plate IV.) may contain from two to 

 ten gallons. 



K, the regifter tube; the ends of which are cemented into 



• Ctonmutrictreid by the Author. 



L 4 two 



