Mr. Bevan's Remarks on Mr. J. Taylor's Rain-gauge. 29 



the crystalline part in spirit of wine and obtained the hematin 

 in regular crystals. 



Tartrate of Strontian. Primitive form an oblique rhombic prism. 



P on M .... 92° 35' 



M on M' . . . . 125 20 



This salt was formed by adding a solution of tartrate of 

 potash to one of nitrate of strontian. 



On platina wire with borax before the blowpipe the chrorao- 

 sulphate of nickel and potash gives a transparent light brown 

 glass ; the chromo-sulphate of zinc and potash a transparent 

 yellowish-green one. Yours, &c. 



Bamsbury Park, Dec. 10, 1827- E. F. TESCHEMACHER. 



VII. Remarks on Mr. J. Taylor's Rain-gauge. By B. Be van, Esq. 



To the Editors of the Philosophical Magazine and Annals. 

 Gentlemen, 

 ¥N the last Number of your Magazine, at page 406, is a de- 

 * scription of a rain-gauge by Mr. J. Taylor, in which a re- 

 ference is made to my selt-registering gauges, as described in 

 a former Number *. 



From the tenor of the paper, it may be supposed that the 

 gauge invented by Mr. Taylor was an improvement upon 

 mine. Now setting aside as far as may be, a partiality for our 

 own inventions, I am not able to see in what respect it can 

 be denominated a registering instrument : it may serve, and 

 doubtless will, to point out the total quantity collected in the 

 intervals of inspection, and so will the old simple floating in- 

 dex ; but neither of them will show the time of commencement, 

 the duration, and the rate of raining, for each shower, — which 

 was effected by my gauges for some years : and although it 

 was necessary to wmd up the clock, and replace the paper on 

 the cylinder once a week, it could not be considered any very 

 objectionable trouble, considering the information it afforded ; 

 the whole operation might possibly occupy about five minutes, 

 and as this occurred but once a week, it was not quite equal 

 to the proportion of one minute per day. 



I am aware, that to a gauge, such as is described by Mr. 

 Taylor, additional apparatus might be applied, so as to ren- 

 der it a proper registering instrument ; but at present it does 

 not seem to possess any great superiority to the common float- 

 ing gauges. 



* See Philosophical Magazine and Annals, vol. ii. p. 74. 



The 



