' Mr. Mulam's Ga^-Mder. S65 



tionsof the interior cylinaer ; and, as the capacity of this is 

 known, and the number of teeth in tl>e wheels adjusted accord- 

 h Sv, t V.e dial indicates, on inspection, the number of cul.c ee 

 dl-^as that have passed through the meter s>acc the counter was 



^' Now, supposing the exit pipe R is connected with the great 

 pa ome er, or with the street main, and that the gas is flowing 

 fn Tove the partition h of the detecting valve, and that there ,5 

 a p.-oper quantity of water in the n.achine, the cup ^ wdl be 

 elevatld above the opening in the partition hy jl^'^.A'^l.^' " ''^^' 

 allowing the gas to pass through the inverted i^ipe D, fills he 

 centrarchamber E, fig. I ; and, as the openmg a vs abo^ the 

 surface of the water, the gas passes nUo the ^j^^^P^''^" ^ ^J 

 The water being displaced by the entrance of the gas, and the 

 emtipoise being distirbed, the interior ^vl-der w^ nKive on Us 

 axis towards the left hand, till the compartment G ts filled wuh 

 gas, the water i^assing out by means of the exit openuig 2. By 

 fhTs time the ooening « will have sunk beneath the surface of the 

 watei and the opening wi,l have risen above the water and 

 the u^s wdl continue to flow into the compartment H, till he 

 exit opening 2 rises above the water, and allows the gas ,n the 

 compartment G to escape into the outer case in proportion as 

 the later enters bv the opening a. So that the compartments 

 on the left hand are in succession emptied of vyater and hlled 

 vv^th gas, while those on the right hand are filling with water 

 which expels the gas into the outer case. From this it is con- 

 vcyed bv the pipe L, fig. 2, to the regulator ; the inner d.vsion 

 oflhich it enters through the pipe O, at the entrance o wh.cli 

 is a blunt cone suspended by a piece of wire with swivels attached 

 to the inner vessel N ; in this entrance there is a plate with a 

 hole in It, of equal diameter to that of the frustum of the cone : 

 consequently, as the inner vessel rise,., the cone closes up the 

 opening in ihe plate, which action is regulated by the pressrn-e 

 of the pas between the surface of the water and the top of the 

 inner vessel. Thus an uniform pressure is maintained in the 

 inner vessel, and the gas passing from thence by the pipe I to 

 the burners, is also necessarily under the same pressure ; the 

 effect of which is, that the flame from the jets is never waver- 

 in- or intermitting, but always preserves the saine height, and 

 wfth gas of the same quality affords at all times the same (pan- 

 tity of light. 



LX. Thoughts 



