GRAVITY  OF  WATER  AT  DIFFERENT  TEMPERATURES.  147 
F.  to  equal  1000,  the  results  were  again  reduced,  so  that  water 
at  60Q  should  equal  1000. 
Table  No.  1. — Reduced  from  Kopp's  table  as  above  stated. 
(Vol  i.  of  the  Cavendish  Society's  Works.) 
Table  No.  2. — Tralles'  table  for  every  5°,  the  intervening 
degrees  being  interpolated  :  Water  at  40°  ==  1000.  (lire's 
Dictionary,  Art.  Alcohol.) 
Table  No.  3. — Hallstrom's  table  for  every  9° :  Water  at 
39-38  =  1000.    (Booth's  Cyc.  of  Chem.) 
Table  No.  4. — Despretz's  table  of  the  expansibility  of  water  : 
Water  at  4°  C.  (39.2°  F.)  =  1000.  (Journal  de  Chim.  et  de 
Phys.,  vol.  lxx.,  1837.)  Contained  in  a  very  able  and  lengthy 
paper,  giving  all  the  details  of  the  numerous  experiments  on  the 
subject. 
Table  No.  5. — Hassler's  observations,  collated  and  reduced 
by  J.  H.  Alexander  :  Water  at  40°  =  1000.  (Silliman's  Jour- 
nal,  vol.  xvi.,  1853.)  These  experiments  were  originally  pub- 
lished in  a  congressional  document  (1832)  in  a  report  on  the 
comparison  of  weights  and  measures,  and  are  stated  to  have 
been  made  on  a  very  large  scale. 
Table  No.  6. — My  own  observations,  corrected  for  the  ex- 
pansion of  the  glass  bottle,  as  previously  remarked. 
Temp. 
1 
2 
3 
4 
5 
6 
Fahr. 
Kopp. 
Tralles. 
Hallstrom. 
Despretz. 
Hassler. 
W.  H.  Pile. 
32° 
1000.78 
1000.80 
1000.69 
33° 
1000.80 
1000.83 
1000.71 
34° 
1000.83 
1000.85 
1000.73 
35° 
1000.85 
1000.87 
1000.75 
36° 
1000.87 
1000.88 
1000.77 
37° 
1000.88 
1000.88 
1000.78 
38° 
1000.89 
1000.89 
1000.79 
39° 
1000.89 
1000.89 
1000.80 
1000.95 
40° 
1000.90 
1000.90 
1000.80 
1000.95 
1000.63 
41° 
1000.89 
1000.89 
1000.80 
1000.94 
1000.63 
42° 
1000.88 
1000.89 
1000.79 
1000.94 
1000.63 
43° 
1000.87 
1000.88 
1000.78 
1000.93 
1000.63 
44° 
1000.85 
1000.88 
1000.77 
1000.91 
1000.62 
45° 
1000.83 
1000.87 
1000.75 
1000.88 
1000.61 
46° 
1000.80 
1000.85 
1000.73 
1000.85 
1000.59 
47° 
1000.77 
1000.83 
1000.70 
1000.82 
1000.57 
48° 
1000.73 
1000.80 
1000.66 
1000.78 
1000.55 
49° 
1000.69 
1000.76 
1000.62 
1000.74 
1000.52 
50° 
1000.65 
1000.70 
1000.58 
1000.69 
1000.49  | 
1000.67 
