Management of Light in Illumination. 171 



appears to be the foot of the basket, and which imme- 

 diately surrounds the top of the burner ; and the hollow 

 bracket forms a secondary reservoir. These two reser- 

 voirs are separated by a vertical partition ; and the oil 

 passes from the secondary reservoir into the circular 

 reservoir by a long narrow trunk situated at the bottom 

 of the secondary reservoir, in precisely the same manner 

 as the oil is conveyed from the secondary reservoir of 

 the portable lamp into its circular reservoir. 



To give a passage for the air to enter the circular 

 reservoir, and to pass out of it when the lamp is filled 

 with oil, a narrow horizontal tube, which is concealed 

 in the secondary reservoir, is fixed to the upper part 

 of it, and passing through the vertical partition which 

 separates the two reservoirs opens into the circular res- 

 ervoir. The other end of this tube is turned upwards 

 so as to form an elbow, and passing upwards through 

 the upper part of the secondary reservoir (at the farther 

 end of it, where it is united to the vertical plate which 

 rests against the wall of the room, and by which it is 

 supported), it ends in the open air. 



That part of this air-tube which projects vertically 

 above the secondary reservoir is about i^ inch in 

 length, and it is masked and concealed by means of 

 a hollow cone, similar in all respects to that which is 

 fixed to the stopper that closes the opening by which 

 the oil is poured into the lamp. By placing these two 

 equal cones by the sides of each other, their uses are 

 the less obvious, and the general appearance of the 

 lamp is rendered more simple. If it should be thought 

 more elegant, both these cones may be concealed, by 

 giving to the vertical plate to which the projecting 

 bracket is fixed the appearance of being constructed 



