J4A. SCHMIDT^S FYROMETER. 141' 



Manganefe, 



Some bits of phofphorus were put into a fulphiiric folulion Mang^anefe ?«- 

 ot manganeCe, The next day the phofphorus was o^ a deep "*^^ ^ * 

 brown colour, and on its fur face was perceivable a pleafmg 

 mixture of colours, owing to the reduced metal. The mix- 

 ture was then heated to ebuHition, and after it had grown 

 cold, the manganefe was found reduced in the form of little 

 radiaiing lines on the fufed phofphorus, intermixed with a 

 few fmall globules of the white colour of tin, ' 



In thefe experiments we may obferve, that the phofphorus. General conda- 

 befjde deoxidating the metals, united with the metals when 

 reduced to form phofphures, as was evident in the folulions 

 oflllver, mercury, and tin. 



XXV. 



Account of a new Pi/roj7teter, ivhich is capable of indicating 

 Degrees of Beat of a Furnace. By Mr. J. G, Schmidt, 

 cf Yaffay, in Moldavia. From the Author, 



VV ITHOUT entering into aiiy detail concerning the fub- Pjrrometrka! 

 ilances bell calculated for pyrometrlcal enquiries, I flatter ^^'^^ 

 myfelf that it will be admitted that thofe miift receive the pre- 

 ference which are capable of regularly contra6ling or expand- 

 ing, without altering their chemical properties, when fub- ; 

 jedled to elevated temperatures. 



The permanently elaftic aeriform fluids appear to me to fee Gafes are tlw 

 ^ fuperior in thofe refpe(as to any otiier bodies. ^^ ^^^ ^roa^ 



Let atmofpheric air be freed from moifture by cauftic alkalis, Atmofpheric aif 

 or other bodies, and included in a veflel of platina. This ^'^ '^.^^^^^ ®* 

 ; velTel A (Fig, 3, PL VL), which may be made of any con-^^^*^ 

 ^ venient fize, is connected with the tube B B, of as fine a bore 

 as poffible. This tube is alfo made of platina, and reaches 

 into a vetfel C, which is filled with water up to ee, and 

 into this the tube is fixed air-tight. Out of the veflel C rifes 

 a glafs cylinder G hermetically fealed, including a thermo- 

 njeter, and a graduated tube F F is fecured into the veflel C 

 in a flmilar manner. 



This 



