Management of Light in Illumination. 129 



be again fixed in its place, and the illuminator may be 

 fitted up and fixed at its proper elevation. 



These directions may perhaps be thought tedious ; 

 but I have been acquainted with so many accidents, 

 that such particular instructions would probably have 

 prevented, that I dare not venture to suppress them. 

 By following them strictly, I am quite certain that no 

 disagreeable accident whatever can happen in the man- 

 agement of these new illuminators. 



It still remains for me to give a more particular 

 account of the table illuminator ; and, as it appears to 

 me to be probable that this invention will soon come 

 into general use, I shall be very particular in describ- 

 ing it. The Fig. i (Plate V.), which represents a ver- 

 tical section of it, may serve to give an idea of its 

 general form and appearance ; and it will no doubt be 

 very useful to workmen who may be employed to make 

 these illuminators. 



In this figure the contour of the dome is indicated 

 by dotted lines, and also the form of its little gallery 

 made of japanned tin, which serves as a handle for 

 taking it on and off. The form of the reservoir is like- 

 wise distinctly seen by a vertical section of it. 



It will be observed that a circular groove is made 

 on the top of the reservoir for receiving the dome and 

 keeping it in its proper place, and that the inside of 

 the reservoir is made sloping. It was made of this 

 form, in order that it might less obstruct the light, and 

 that its internal surface might serve as a reflector. 



The oil is conveyed to the burner by one of the two 

 branches seen in the figure, by which the reservoir is 

 fixed to the burner. These two branches are a little 

 curved, in order to give the illuminator a more elegant 



VOL. IV. 



