Q± GREATEST DENSITY OF WATER. 



lnftruaions for A number of water thermometers are to be procured, the 

 experiments. containing veffels of which are of different materials, as earth- 

 bulbed thcrmo- en ware, glafs, and various metals. Each of thefe (hould 

 meters, of earth- con tain one or two ounces (from 4 to 800 grains), more or 

 metal &c. ' ^ s > °f water. Common brown inkftands, which go by the 

 name of Nottingham ware, anfwer very wc-ll for one fpecies, 

 but they require to be well painted without, as they are not 

 otherwife water-tight. I have a few of Queen's ware, made 

 purpofely in Slaffbrdfhire, which conftitute another fpecies 

 of earthen ware ; Home of them are glazed in and out ; others 

 unglazed, but thefe being painted without are made water- 

 tight, and expand the fame by heat as glazed ones: Of glafs, 

 common thermometer tubes, with larger bulbs than ordinary, 

 are fufficient. I have the metallic veffels made in the fhape 

 of cylindrical tin cannifters, conical towards the lop, and at 

 the fummil a fmall cylindrical tube, fuch as te take a ther- 

 mometer tube. The glazed earthen ware and the me- 

 tallic, require moftly to be painted before they are quite 

 tight. 

 Fill them with The veffels being thus prepared, . they are to be filled with 

 boiled water. water previoufly boiled to expel the air ; a thermometer tube 

 with cement is then fuddenly plunged into the veffel and ce- 

 mented faft; the water may then be driven out of the tube 

 by heat, or more may be put into it by a fmall wire; it is 

 then lit for ufe, and a feale of equal parts may be applied to 

 the tube ; or it may be divided, and marks made with a file 

 or paint. 



Some of the refults of my experiments with inftrurnents of 

 this kind, arc as follow : 



Experimental 

 refults noted 

 with three 

 earthen, one 

 glafs, two iron, 

 one copper, one 

 brafs, one pew- 

 ter, and one 

 leaden thermo- 

 meter. 









Water 









loweft, 



1 . Brown earthen ware, 



No. 1, 



Dt 



36° 



2. Brown earthen ware, 



No. 2, 



- 



38 



3. Queen's ware, 



- 



- 



40 



4. Flint-glafs, - 



- 



- 



41| 



5. Iron, thin plate, 



- 



- 



42| 



6. Tinned iron, 



- 



- 



42 f 



7. Copper, 



- 



- 



■'■H ■ 



8. Bra'fs, - 



_ 



. 



46 



9. Pewter, 



- 



_ 



46 



10. Lead, 



- 



- 



49f 



Water the fame 



height. 

 32 9 and 40* 



32 



and 44 



32 



and 4S 



32 



and 5 1 



32 



and .53 



32 



and 63 



32 



and 59 



32 



and 60 



32 



and 60 



32 



and 67 



Another 



