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 4 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; f 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 / 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. 
H2 IV. 
