p.1

Milwaukee Sept 29th 1871

Dr Sir

Upon comparing the reports
recently received here by telegraph from Cheyenne,
with those from lower stations (Omaha, St Louis &c.)
I find the barometer is uniformly reported
too low; in the morning about 0.50 & in the
afternoon about 0.60 of an inch.

This indicates that a corresponding
addition must be made to the figures
in the table of corrections for altitude.
To enable me to find the amount of this
additional correction for the different
temperatures &c. I want a copy of the
original observations (barometer, thermometer attached,
wet and dry bulbs) as taken from the instruments,
without any corrections, for the months
of January and July for all the hours
observed at Cheyenne, Omaha and
St Louis.

It is quite probable we shall
find that rail-road surveys from

[29.968?] [29.027?] [29.598?] [29.998?] [30.755?]