124 Taylors aiid Martineau's Gas Apparatus. 



K A short pipe, communicating from the bottom of the condenser 

 to the top of the oil-cistern ; this conveys the condensed 

 oil at once into the latter, and suffers the surface of the fluid 

 in it to be acted upon by the same pressure as exists at all 

 times in the retorts. 

 L A pipe to convey the gas from the condenser to the wash- 

 vessel M. 



e Screw plug, to allow water to be poured into the wash 



vessel. 

 / A cock to draw water from the wash vessel. 

 </ A cock to regulate the height of water in the wash 

 vessel, and to draw off condensed oil, as it may occa- 

 sionally accumulate there. 

 N Pipe to convey the gas from the wash vessel to the gazometer. 

 O Plate II., Pipe rendered flexible by knuckle-joints, to con- 

 vey the gas into the gazometer at the top. 

 P A similar pipe, leading the gas to the tubes, which conduct it 



to the burners. 

 Q Gazometer made of sheet-iron, and suspended by a chain 

 over pulleys, with a counterpoise. It is placed in water in 

 the usual manner, which may be contained in a brick tank, 

 or in a cistern of wood or cast-iron, as circumstances may 

 render most convenient. 



Art. XI. Some Account of the Character and Merits of 

 the late Professor Playfair. 



[We regret that it has not been in our power to obtain materials for a more 

 extended account of the two eminent persons, whose Biography is 

 sketched in this and the succeeding article, and are not without hopes 

 of accomplishing this on a future occasion. In the mean time, we have 

 thought well to insert the following notices, which originally appeared 

 in the Times newspaper, and which are from the pen of a very spirited 

 writer.] 



It has struck many people, we believe, as very extraordi- 

 nary, that so eminent a person as Mr. Playfair should have 

 been allowed to sink into his grave in the midst of us, without 



