Measurement  of  Mount  Washington,  New  Hampshire,  by  A.  Guyot,  August  8th
1851,  4  P.M.  ;  the  barometer  at  the  lower  station  being  at  825  English  feet  above
the  mean  level  of  the  sea ;  at  the  upper  station  at  one  foot  below  the  summit.
The  observation  gave,

Barometer.  Attached  Thermometer.  Temperature  of  Air.
Gorham,  h  =  29.272  in.       r  =  70°.70  F.         t  =  72°.05  F.
Mount  Washington,       h1  ==  24.030  "         T'  =  54°.52  F.         t'  =  50°.54  F.
T  —  T'  =   16°.38  F.  122°.59  F.
—  64°


)i


t  _|_  t'  —  64  =  58°.59  F.
D  36


BAROMETRICAL    MEASUREMENT    OF    HEIGHTS.
Table  I.  gives  for  h  =  29.272  inches,      .         .         .  28,061.00

"         «       for  h'  =  24.030     "...  22,905.60

Difference,         .         .  5,155.40

Table  II.  gives  for  r  —  r'  =   16°.38     .  -  37.64

Approximate  difference  of  level,  D  =  5,117.76
D  X  (t  -h  V  —  64)   _      5118  X  58.6
900                                 900

Second  approximate  difference,  D'  =  5,450.95

Table  III.  gives  for  D1  =  5450  and  Lat.  44°  .  .  0.50

Table  IV.  gives  for  D1  =  5450  ....  14.94

Table  V.  gives  for  h  =  29.27  ....  0.00

Barometer  below  summit,     .         .  —  1.00

Mount  Washington  above  Gorham,  or       .  Z  =     5,465.39

Barometer  at  Gorham  above  sea  level            .  825.00


Mount  Washington  above  the  sea,  or  altitude,  .         .        6,290.39  Eng.  ft.
Example  2.
Measurement  of  the  highest  peak  of  the  Black  Mountain,  in  North  Carolina,  July
llth,  1856,  by  A.  Guyot.
By  observation  we  have  at,

Barometer.  Attached  Thermometer.  Temperature  of  Air.
Mountain  House,       h  =  24.934  in.        r  =  64°.58  F.         t  =  61°.34  F.
Highest  Peak,  A'  =  23.662  "         r1  =  61°.88  F.         t1  =  59°.36  F.
