[ 1*2 j 



poliffied on the other fide, to hammer metals 

 upon. 



Above this fteel plate n. and within the circle, 

 drawn round about it, is the place for a candle- 

 ftidk. This candleftick is fhewn in plan, fig. 2, 

 and in profile, fig 3, Tab. II. It confifts of a 

 round brafs plate ; the point a. and the ring b. 

 round it, is inftead of the focket in another can- 

 dleftick, which would here take up too much 

 room. 



Fig. 4, (Tab. II.) is a thin iron ring, a fixth part 

 of an inch high ; within this ring the pounding and 

 grinding of the things upon the fteel plate fig. 1, n. 

 is performed, that they may not be loft. In 

 packing up, this ring is to be put loofe upon 

 the candleftick ; and, as it is lower than the point 

 of this, it does not take up much room in the 

 cafe- 



The whole cafe, thus made, with all the inftru- 

 ments in it, as I have defcribed them, is no more 

 than one and an eighth part of an inch high, and 

 confequeiitly not more troublefome to be carried 

 in the pocket than a frnall book *, 



* The Pocket Laboratory here defcribed, and the Box for the 

 Acids, mentioned in Seft lxii. have been imoroved after the 

 manner of Mr. Cronftedt, by a gentleman particularly ac- 

 quainted with Mr. Engeftrom, from whom he learned this 

 method of making Mineralogical Experiments. The bulk of 

 the firft has been reduced nine and a half cubic inches ; its 

 length being diminifhed one fixteenth of an inch, the breadth 

 five ditto, and the depth two; notwithstanding which, there 

 is alfo added a piece of charcoal for trying the experiments, 

 a flint, a piece of agaric tinder, and fomc matches for light- 

 ing the candle. The three phials d e/ior the ialts, are of diffe- 

 rent colours, to prevent any miftake. The candleitick s has diffe- 

 rent concentric grooves for keeping the refults of the trials fe- 

 parate. The blow- pipe c b has a hi ver mouth- piece, and fcrews 

 in the middle of the ball, in order to clean out the moiilnrc with 

 the greater cafe ; and the fmall wire [Sect, ix.] is more 

 conveniently detached than fixed round it. The other box 



for 



