Pyrometry  and  Areometry , See,  551 
x Thermometer  fufpended  in  the  water. 
yy  A rod,  to  the  lower  end  of  which  is  fixed  a fmall 
plate,  to  ftir  the  water  by  moving  it.  up  and  down. 
zz  A fyphon,  one  branch  of  which  is  within,  and  the 
other  without,  the  bottle,  the  latter  with  a cock; 
ferving  to  draw  off  the  quantity  of  water  which  is 
neceffary  for  changing,  the  temperature  in  the  bottle., 
F 1 g.  hi,. 
a The  ball  of  the  Areometer , which  is  of  glafs  and 
empty,  except 
b The  fmall  cittern  at  the  bottom,  which  contains  quick- 
lilver. 
cc  The  branch , made  of  a thin  metal  tube,,  cemented  to 
the  ball. 
- * 1 
45,15  Two 
x Thermometre  fufpendu  dans  l’eau. 
yy  Baguette  au  bas  de  laquelle  eft  une  petite  plaque,  qui  fert  a agiter  l’eau  en  la 
faifant  mouvoir.de  has  en  haut  et  de  haut  en  bas* 
%z  Syphon,  dont  une  des  branches  eft  dans  la  bouteille,  et  I’autre  au  dehors 
portant  un  robinet;  fervant  a tirer  de  la  bouteille  la  quantite  d’eau  neceftaire 
aux  changemens  de  degres  de  chaleur. 
FIG.  III. 
a Boule  de  VAreometre , qui  eft  de  verre  et  vuide,  excepte 
b Le  petit  refervoir  rempli  de  mercure. 
cx.Lz  branche,  faite  d’un  tube  mince  de  metal  cimente  a la  boule. . 
45,15  Deux 
