GAS, COAL 



is evaporated in oblong cast-iron troughs placed in the ash-pit of the furnaces, and the 

 dried lime is partly employed for luting the apparatus, and partly disposed of for a 

 mortar or manure. 



1042 



Fig. 1041 shows elevations and sections of dry -lime purifiers, which may also be 

 used for other forms of dry purification. A is the longitudinal elevation ; B ditto 

 section ; c transverse elevation ; D ditto section. 



Figs. 1042 and 1043 represent another form of 

 dry purifier, combined with a washer or scrubber, 

 patented by Mr. Lees of Manchester. Fig. 1042 

 is an elevation, partly in section of this appa- 

 ratus, and fig. 1043 is another elevation, also 

 partly in section, of the same, a is a hopper, into 

 which the dry lime is fed ; b is a damper, or sliding 

 door, by which the supply of lime can be regu- 

 lated ; c is a sheet-metal tube, containing the worm 

 or screw, d, the axis of which is supported at one 

 end by the stuffing-box e, and at the other end by 

 the bearing /. A slow revolving motion is given 

 to the worm d from the driving shaft g, by means 

 of the bevel-wheels k, upright shaft , wormy, and 

 worm-wheel k, fixed on the axis of the worm. 



The lime in the hopper <z, is kept in motion by 

 the screw n, which is turned slowly round by the 

 worna^r, the worm-wheel o and bevel -wheels p, one 

 of which is fixed on the screw n. The tube c is 

 open at </, to admit the dry lime from the hopper 

 a, and the worm or screw d, is furnished with cross 

 pieces d' to agitate the lime which is gradually 

 moved from the hopper to the other end of the tube 

 c, by the revolving of the worm. Below the tube 

 c is another tube I ; y is a syphon, by which the 

 washing fluid is supplied and conducted to the 

 chamber s, which then flows clown the tube I to the 

 chamber r, keeping the level indicated by j b. z 

 are two paddles, fixed upon the circular perforated 

 plates, which are set to an angle, and secured to 

 the shaft ml, and are revolved speedily by the _J 



