g$ GAS LIGLT FROM COAL. 



Description of gradually as the gas enters it and displaces the water; the 

 the apparatus. two W€ jg| lts £ £ suspended over pullies by chains keep it 

 steady and prevent its turning round, otherwise the lower 

 stays M of the gasometer would come into contact with the 

 vessel H. There are two sets of these stays, one shown at 

 M, and the other at N. 



There is also an iron pipe O, made fast in the centre of 

 the gasometer by "means of the stays, which slides over the 

 upright pipe P, by which contrivance the gasometer is kept 

 firm and steady, when out of the well ; it likewise prevents 

 the gas from getting into the cast iron pipe P, and the cop- 

 per pipe R y any where but through small holes made in the 

 pipe O at S at the top of the gasometer, where the gas is 

 perfectly transparent and fit for use. 



The pure gas enters the tube O at the small holes made 

 in its top at S, and passes on through the tubes P and R to 

 the lamps, where it is consumed and burnt. 



The seams of the gasometer are luted to make them air 

 tight, and the whole well painted inside and out, to preserve 

 it from rust. 



Fig. 2 shows a horizontal section of the lower hoop of the 

 gasometer K at the part M, with its stay6 or arms, and the 

 manner in which the iron pipe O, before described in fig. 1, 

 sliding on the tube P, passes through the ring in the centre 

 of the hoop. A horizontal section of the receiver H ap- 

 pears therein. 

 Lamps for Fig. 5 shows a section of one of the gas lamps. The 



burning the S p a ce between the outer tube T and the inner tube V, is to 

 be filled with gas supplied by the pipe R, shown in fig. l, 

 where a stop cock is inserted for adjusting the flame, which 

 gas passes through a number of small holes made in the 

 outer edge of a circular plate shown at fig. 6, which unites 

 the tubes Tand V at their tops. Fis the inner tube which 

 conveys the atmospheric air into the centre of the flame; 

 the upper part of this tube is made conical, or widening 

 outwards, to join a circular plate with holes in it, a hori- 

 zontal view of which is shown at fig. 6. W is a button, 

 which eau be placed at a small distance above the mouth of 

 the lamp, and its use is to convey, in an expanded manner, 

 all the air which rises through this tube to the inner surface 



of 



