1 68 Management of ' Light in Illumination. 



violent concussion of the oil, in the sudden jolts of the 

 carriage ; or the same end may be attained by dividing 

 these reservoirs into a number of small compartments, 

 by means of their vertical partitions of tin, having each 

 two small holes of about one tenth of an inch in diame- 

 ter, the one on a level with the bottom of the reservoir, 

 and the other on a level with the top of it. These 

 partitions will not prevent the reservoirs from being 

 filled with oil, and they will most effectually prevent 

 the oil from being thrown out of the lamp, in conse- 

 quence of the jolting and swinging motion of the car- 

 riage. 



A hint is sufficient for English workmen ; and their 

 ingenuity and address are such that they seldom fail to 

 succeed in what they undertake. 



By increasing the size of the portable lamp in all 

 its dimensions, it may without any kind of difficulty 

 be made to contain oil enough to supply a burner on 

 Argand's principles, of the full size ; and by increasing 

 the size of its screen the handle of the lamp may be 

 entirely concealed. 



When constructed in this manner, its form becomes 

 perfectly elegant, and such as will render it proper to be 

 used as a table lamp in the most elegant apartments. 



The prices at which these portable lamps have been 

 sold at Paris have varied from ten to twenty francs, 

 according to their sizes, and the manner in which they 

 have been ornamented. 



