504  Mr.  de  luc  cm 
I fuppofe  that,  according  to  the  ufual  method, 
feek.ing  for  the  dilatations  of  the  fpirituous  liquor  by 
great  differences  of  heat,  one  was  to  compare  its  bulk 
in  ice  that  melts  and  in  boiling  water,  and  that  not  know- 
ing, or  not  regarding,  the  different  progreffions  of  this 
liquor  and  quickfilver  in  their  refpe&ive  dilatations, 
nor  the  effedt  which  the  difference  of  fpirituofity  pro- 
duces in  this  refpedt,  one  fhould  confider  thefe  progref- 
fions as  proportional.  Here  are  the  deviations  one  would 
be  expofed  to  in  the  limits  of  the  temperatures  to  which 
the  rule  fhould  be  applied,  I mean  between  o and  20°. 
The  numbers  which  are  placed  in  the  two  columns  of 
the  fpirituous  liquors  indicate  tfie  proportions  of  the 
augmentations  of  their  bulks  by  the  temperatures  indi- 
cated by  the  quicklilver  Thermometer.  I have  given  to 
the  total  fcale  of  thefe  proportions  the  fame  number 
of 
Jc  fuppofe  d’abord  que  fuivant  l’ufage  ordinaire,  cherchant  les  dilatations  de 
la  liqueur  fpiritueufe  par  dc  grandcs  differences  de  chaleur,  on  compact  fes 
volumes  dans  la  glace  qui  fond  et  dam  l’eau  bouillantc;  et  qulgnorant  ou  negli- 
geant  la  difference  de  marche  de  cette  liqueur  et  du  mercure  dans  leurs  dilata- 
tions, ainfi  que  l'effet  que  produit  mcme  a cet  egard  la  difference  de  fpirituofite, 
on  regardat  ces  inarches  comme  proportionelles ; voici  les  ecarts  dans  lefquels 
on  tomberoit,  dans  les  limites  des  temperatures  ou  Ton  appliqueroit  la  regie; 
c’eft  a dire  de  o a 20°. 
Les  nomhres  places  dans  les  deux  colonnes  des  liqueurs  fpiritueufes,  marquent 
les  rapports  de  leurs  augmentations  de  volume  par  les  temperatures  indiquees  fur 
k Thermometre  de  mercure.  J’ai  donne  a Techclle  totale  de  ces  rapports  le 
mcme 
