Pyrometry  and  Hreometry,  See.  - 513 
other,  left  the  error  arifing  from  confidering  the  immer- 
fions  of  the  Areometer,  occafioned  by  the  changes  of 
temperature  of  the  liquor,  as  being  exactly  proportionate 
to  the  indications  of  the  Thermometer,  fhould  thereby 
be  rendered  fenfible. 
Every  part  of  the  Inftrument  being  thus  determined, 
it  will  be  eafy  to  conftrueft  it  every  where  in  an  uniform 
manner.  Experiments  will  then  be  made,  and  the  degree 
of  fpirituofity  wrhich  liquors  in  trade,  under  certain  de- 
nominations, ought  to  have,  will  be  fixed:  fpirit  of 
wine , for  inftance,  brandy  named  three-fifths  in  Lan-* 
guedoc,  that  which  is  called  proof  of  Holland , or  any 
other.  Thefe  points  being  known,  as  the  ftandard  of 
the  precious  metals  fixed  by  the  different  States  that  coin 
money,  there  will  then  be  eftablifhed  a proportionate 
value  of  the  degrees  of  fpirituofity , which  fhould  be 
found 
de  rendre  fenfible  l’erreur  qui  refultera  toujours  de  cOnfiderer  les  enfoncemens  de 
1’Areometre  provenans  des  variations  de  la  chaleur  de  la  liqueur^  com  me' 
exa&ement  proportionnels  aux  indications  du  Thermometre. 
Toutes  les  parties  de  l’lnflrument  etant  ainfi  determinees,  il  fera  aifede  lecon- 
firuire  partout  d’une  maniere  uniforme.  Oh  fera  alors  des  experiences,  et  Tori 
fixera  a certains  points  de  PAreometre,  le  degre  de  fpirituofite  que  devront  avoir 
les  liqueurs  attendues  dans  le  commerce  fous  certaines  denominations;  Vefprit  de 
vin>  par  exemple,  Veau  de  vie  nominee  trois  quints  en  Languedoc,  celle  qu’on 
nomme  a Pepreuve  de  Hollander  ou  telle  autre:  et  ces  points  etant  connus, 
comme  on  connoit  les  titres  des  metaux  precieux  fixes  par  les  divers  Etats  qui 
battent  inonoye,  il  s’etablira  aufii  une  valeur  proportionnelle  des  degre S de  fpiritu - 
R r r 3 oftti 
