Management of Light in Illumination. 167 



The small cylinder of wood (or cane) in the centre 

 of each cord is distinctly represented. 



The projecting rim of the burner is indicated by a 

 dotted circle. 



The diameter of the cylindrical burner is nine twen- 

 tieths of an inch. 



A wick of this form is easily trimmed ; its flame is 

 uncommonly beautiful ; it may be made to burn well 

 with a moderate light, or to give a great deal of light. 

 The flame occupies the axis of the glass chimney with 

 great steadiness ; and the lamp may be made to burn 

 with a very small flame when necessary, without either 

 smoke or smell. 



To all these advantages we may add one more, which 

 on some occasions may be very useful. When the burner 

 is cylindrical, it may easily be closed with a fit stopper 

 of cork ; and the lamp, filled with oil, may be carried 

 about in a carriage with the greatest safety, and always 

 be ready to be lighted when wanted, either in the car- 

 riage or at inns on the road. 



I have more than once carried one of these lamps in 

 one of the pockets of my post-chaise, in travelling, and 

 without ever having had reason to repent of the con- 

 fidence I placed in its cleanliness, as I have already 

 observed in another place. 



It is hardly necessary that I should observe that by 

 means of a trifling alteration in the form of the second- 

 ary reservoir of this portable lamp, and the suppression 

 of its foot, it may be made to serve perfectly well on the 

 outside of carriages, instead of the lanterns now in use. 



If it should be found to be necessary, a quantity of 

 baked horse-hair, of very fine brass wire, may be put 

 into each of the reservoirs, in order to moderate the too 



