2(U On the Colours of a Jet of Steam. 



Alumina -142 



Carbon -920 "^ " 



Hvdi-own 5i '^ bo " lr li#* 8«otooiI ortt Ho 



Nitrojren 1452 ,lI S hc ' 8£W V s6 



° ' usrtqu w< ' ' , 658 Itgni 



yg en » I-rf „j ^ 9l jj • . • 29 . 2O 0ibni 



Sulphate of potash . 4-527 



Sulphate of soda,'*™ . If.* 9 3600 



Sulphate of lime . . **"* -279 



Sulphate of magnesia, ji I° r e ' J ™ '924 



Sulphate of soda, . ' *[§' ,; ? A { ^Ss™ fcwortnom 



Hyposulphite of soda, Ju ? ' *A™*i&JjgJrin<* 



Sulphuret of sodium, . . 1-651 



Phosphate of soda, . . »?> < -540° l li ? 



Carbonate of soda . K - *??« 5-306 



Chloride of potassium, '"'f . 1 ** 26-491 *'"° ! 



' ',7 Chloride of sodium, r ° J . ,I " aiH . lfc "19-334 



m i -j x* i • '31017 xiiiw snitan-jaija jaea ii .boxixist 



Chloride of calcium, y r .. ° -229 



Iodide of magnesium, > L -316 



^ il d -j r • ™ w 'itfoloo aiffi • iiroloo ni 9*onj5To 



Bromide of magnesium, . . trace. 



Water .(SGI) 6<800 offo-x exfo e^if 



M 1 ^inaasiq exit §aiJatfjfwj b a& t xio-bn o 8fJ$ft<ftI 

 yJxioxiixiioo bxxs <oaIc ; te^ neeig irfghd js omb js te torxxo m a -xol r 



ovcd I tad* siu'a foa rxus I atax* bejooftei sxfo rxl ."'I QO-209 J * 

 ho tthmitsniedT .oafd bxic Joloxv t bo'i-o^nmo aaili yioifigfrrfU ync 



f)9J00 



Ow- the Colours of a Jet of Steam. 



Professor J. D. Forbes, some years ago, observed that a jet of 

 steam absorbed the more refrangible portion of white light.* It 

 happened, during some experiments, that a blue jet of steam caught 

 my attention, and further experiments soon assured me that it was 

 easy to obtain a jet of almost any colour. 



A blowpipe jet was screwed on a T-piece, and the opposite open- 

 ing of the T-piece was supplied with a stopcock, while the third 

 opening of the T-piece communicated, by means of a tube, with the 

 cock of the boiler. The blowpipe jet had an orifice about T §g-ths of 

 an inch diameter, and its axis was elevated about 28° above the 

 horizon. The stopcock on the T-piece was furnished with a little 

 contrivance for preventing the steam that it discharged from inter- 

 fering with the appearance of the steam discharged by the blowpipe 

 jet ; the use of this stopcock was to blow off the water which con- 

 densed in the steam passages. A pressure was maintained in the 

 boiler of about 40 lbs. on the inch. 



On fully opening the cock of the boiler a jet of steam was obtained 



* Philosophical Magazine, 8. 3, vol. xiv.. p. 121, 



