S^ OK ILLUMINATION. 



Description of out of the reservoir easily, and the oil enters without any 

 'c;<'rTl? obstacle. 



ford. Wben this lamp is filled with oil the reservoir must be firmly- 



placed in a horizontal situation, upon a stand made on purpose 

 to support itduring the operation, and the three stoppers must 

 1>e taken out ; tlie reservoir being filled, care is taken to re- 

 .place the stoppers, and to close the little holes by the screws 

 before it is taken trom its stand. 



These little holes must not be opened till the lamp is sus- 

 j^entted in its place in the gilt hoop, and at rest ; and attentioin 

 »h6iikl alwa)'s be paid to close them before lifting the lamp to 

 tike it from its hoop. These precautions are absolutely neces-r 

 «ary- in order to avoid the risk of spithng the oil. 



When this lamp is suspended at a proper elevation above 

 iht middle of a round table, large enough for placing con- 

 veniently ten or twelve persons, in a room 24 feet long, by 20 

 ieet wide, and 13 high, not only the table, but likewise the 

 whole room is complettly lighted, without the least visible 

 shadovv. being produced in any part, and without any person 

 at table, or in the other parts of the room, being incommoded 

 by the direct rays from the three flames which are united at 

 the centre of the Ijimp. I'he diameter of the hoop of crape 

 which masks these flames is so great that the light which it 

 emits from its surface is very soft, although it receives the 

 direct rays of the three flames. 



. As the light which this lamp diffuses in a room pi'oceeds 

 /fom one single source,' the shadows of the enlightened ob-*^ 

 jects are of course simple, and well defined, a circumstance 

 which certainly contributes much to the ease with which we 

 distinguish objects, as well as to the pleasantness of the illumir 

 nation, and the preservation of the eyes. 



in order to light the table of a dining-ro9m or study, of 5 

 OT 6 feet in diameter, a small lamp witli one wick vviirbe suf- 

 ficient, and instead of suspending it from the cieling, it may 

 be placed on a pedestal, at the height of 12 or 1 5 inches above 

 the table. For a lamp with one wick, intended to burn 8 or 

 .10 hours, the circular reservoir for the oil may be made 6 

 inches in diameter within, I inch wide, and -;-% of an inch deep. 

 Tiie conical rellcctor of cra])e, or roughened glass, for this 

 Lcnp sboaM le 8 inch..?; in diatntter belqWj.S iii-qhes. in di^- 



n eter 



