Of the Excellent Qualities of Coffee. 647 



I have caused a very beautiful urn to be constructed, 

 with a concealed spirit lamp which serves for heating 

 water for making either tea or coffee, and for making 

 both tea and coffee at the same time. It is represented 

 by the Fig. 3, Plate XL, which is drawn to a scale of 

 one quarter of. the full size. 



This urn is placed on what appears to be a block of 

 black marble, seven inches square and two inches and 

 a quarter in thickness. This is made of strong sheet 

 iron japanned black, which serves for concealing a 

 spirit lamp on Argand's principles, which is employed 

 in keeping the water in the urn boiling hot. The foot 

 of the urn is hollow, and serves for concealing the 

 chimney of the lamp. 



It is perforated by two rows of small round holes, 

 the one in the moulding at its lower extremity, which 

 serves for the admission of the air which is necessary 

 for keeping the lamp burning ; the other near the upper 

 extremity of the foot where it is united to the body of 

 the urn, which serves as a passage for the escape of 

 the vapour which is generated in the combustion of the 

 ardent spirits. 



There is a large circular hole in the top of the square 

 box (of sheet iron) on which the urn is placed, which hole 

 is covered and completely concealed by the foot of the 

 urn. 



This hole, which is 5^ inches in diameter, is the pas- 

 sage by which the lamp enters when it is placed in the 

 square box ; and by means of a rim, about a quarter of an 

 inch in width and 5.} inches in diameter, which is fixed to 

 the lower part of the foot of the urn, and which enters 

 the circular hole in the top of the box, by turning 

 round the urn to the left one quarter of a whole revo- 



