SfruetStlSj^icndid limp* with circular hdntoHfatl ffeseHoiH, But Be^tt^piM^ 

 none of them had been attended with success. That which I ^ ^^'^^^fltJ' 

 jidw propose is sim[)ie in its construction, and apjjeal'^ ^o'^^foii, •*'^^ 

 to answer perfectly well. 



This reservoir is closed abo'^'Ci sd as to form a holldtr liddp, 

 Arid it has three openings on its upper surface, equidistant 

 from *ach other. These Openings, which ierve for potn-in^ 

 the oil into the reservoir, have each -ff of an inch in diameter, 

 ■arid Jtre hermetically closed by three stoppers of braSs, ground 

 U'ith emery. In the axis of each of these stopp&rs therip i^ a 

 small hole, -/^ of an inch in diameter, which is occasi(;>ria^j^ 

 closed by a small screw furnished wifh a collar of leatheK 



When the reservoir is filled with oil, the three jJto|<pers art 

 |iilt in their places, and the small holes are then clo^d by 

 means of the three screws. In this state of things^ as the ait 

 icannot enter into the reservoir by the opening afrits lippA 

 ftuJ'face, the lamp may be» transported 4 and eten inclined cdh« 

 siderably, without any danger of spilling the dU. Ai so6a dl 

 the lamp is placed in its hoop (where care is taken to StiSpfehA 

 it in a horizontal position) , the cohnrtianicatioii must be dpeni^d 

 between the air of the atmosphere and the upper iSurfoce of thfc 

 'Oil in the reservoir, which is done by unsjrrewing a few tiirfife 

 thfe small screws which are in the axis of tHe ^topj«r^. TJtfc 

 oil then resumes its natdral level, and aftei-wardi |}asses freelj^' 

 into the cylinders that contain the Wicl^J iti order i© feeid ikt 

 flames. 



That it rnay not be nccess^'ry to take out the SCteW entirely 

 when a passage for the air is opened by raeani of the vertical 

 holes in tlie axis of the stoppers, the^e screws,. Which are half 

 an inch in lengthy are mt Cohiplfcte, being reduced on one sidfe 

 to the half of tljeir diametfcfs, it\ theit whole length, except 

 about -rV ^^ an iuch at the top near the Collar of leather. 



When the screw is tlnscrcwef} two ttirns, the part of the 

 ectew that still remains in the hole riot being entire, a free 

 |)assage is necessarily opened into the interiot of the reservoir. 



it would be possible to fill the reservoir of this lamp by one 

 opening only, which would require only one stopper and one 

 icfew ; but I have found by experience that it is inconvenient, 

 and that it is muCh better to fill the reservoir by three holes, 

 jn the niianner abaVe described j for hi that CaSe thfe air t^ets 

 F2 "out 



