AND ON PREVENTING ITS EXPLOSION. 



59 



Fig. 2. represents the Moveable Lamp. 



A, Is a lantern of tinned iron, five inches in height, and three 



inches in width, with a glass lens a, three inches in diameter, 

 projecting half an inch in front. The lamp b is introduced 

 at an opening behind, which i$ closed with a cover secured 

 by a wire, passing into a small groove or tube, as repre- 

 sented at c; d is the aperture in the small dome at the 

 top, by which the smoke and air escape ; e is a small pro- 

 jecting plate to disperse the current of hot air ; / the 

 handle, which rises from the double back. 



B, Is the tube of leather, with a spiral wire within, to prevent 



its compression, which conveys the air to support the 

 flame ; three-fourths of an inch in diameter, and from three 

 to four feet long, and represented in two parts, to shew its 

 length. It is adapted by a screw to the short projecting 

 tube g, at the bottom of the lantern ; and the lamp within 

 resting on a plate at the height of half an inch from the 

 bottom, the air enters beneath this, and rises by its sides. 

 To the under end a tin tube h is adapted, closed at the end, 

 with apertures in the sides, at the height of about three 

 inches, to admit the air ; this having the same advantages 

 as the turning up of the tube in the former figure, and in. 

 a moveable lamp being more convenient. 



H 2 IV. 



