EXPLANATION OF THE PLATES. 353 



PLATE XXL 



This plate, which represents Kingston's valves, is given by Mr. Dinnen as con- 

 nected with the subject of his valuable paper in the Appendix on steam boilers, and 

 the following is his description, &c. 



I. BLOW-OFF VALVES. 



a, Gun-metal pipe with conical base, passing through the ship's bottom, with the 



conical part outwards and made even with the same. Inboard, the cover of the 

 pipe (forming the gland or stuffing box and the nozle which joins to the stop- 

 cock of the blow-off pipe) is screwed on the upper end of the pipe, down to 

 the ship's floor, on to a chock of wood fitted thereon as requisite, in the manner 

 of a screwed bolt and nut. 



b, The valve, fitted within the cone of the pipe and opening outwards, having a 



copper rod which passes through a stuffing box in the cover. A guard pro- 

 tects the valve beneath. 



c, Cover, which is screwed tightly on the pipe. 



d, Gland or stuffing box. 



e, Handle for lifting the valve. 



f, Nozle, with a flanch for connecting the valve with the stop-cock of the blow-off 



pipe. 

 7, Guard, extending across the base of the pipe, and having no guide spindle passing 



through it ; for the object of allowing the valve to be pressed entirely on one 



side, thereby affording a more ready passage to any matters intruding into the 



pipe from the boilers. 

 x, Planking of the ship's bottom. 

 m, Timbers of the ship's floor. 

 n, Chock, fitted on the timbers to accommodate the required length of the pipe. 



II. INJECTION VALVES. 



a, Gun-metal pipe, passing through the ship's bottom. 

 b', The valve, having a guide spindle below. 



2 Y 



