Ii8 Management of Light in Illumination. 



wick. The introduction of this small improvement 

 has, I am persuaded, contributed very much to the 

 approbation universally bestowed on the table illumi- 

 nator and to its rapid introduction into general use. 



In the table illuminator the small quantity of oil 

 which occasionally leaks out of the burner below 

 descends immediately into the column on which the 

 illuminator is placed, consequently it is never seen, 

 and may easily be removed as often as shall be found 

 necessary. 



For receiving and at the same time concealing the 

 leakage of the burners of pendulous illuminators, a 

 shallow globular dish of tin, painted white and var- 

 nished, about 4 inches in diameter and i inch in depth, 

 is fixed, by means of a strong screw passing through 

 its centre, immediately under the lower extremities of 

 the burners. The bottom of this dish is ornamented 

 below by a large gilt knob in the form of an acorn, 

 which gives it the appearance of having been placed 

 there for the sole purpose of giving an elegant finish 

 to the balloon below or to cover the ends of the burn- 

 ers, and for presenting a convenient handle for taking 

 hold of the illuminator in moving it up or down. 



There is a circular opening in the under part of the 

 balloon, of about 2 inches in diameter, through which 

 the brass knob projects downwards ; and there is also a 

 circular opening, of about 4 or 5 inches in diameter, in 

 the middle of the hemispherical screen which forms 

 the upper half of the balloon or the dome, through 

 which opening the ends of the glass chimneys project, 

 which belong to the burners ; but neither of these 

 openings is much noticed when the illuminator is in 

 its proper place, and that above is indeed never seen, 



