.   ,0 66 ` Circular No. 9. ‘ _· A l
Q .0 pressure. The apparatus was therefore standardized at l
T, 770 F. (250 C.) and 740 mm. pressure. A table of c0rrec—— pf
3 ` tions was computed for a given range of temperatures and ·. ' 1
, ` is to be referred to when the temperature differs five l
U · _ degrees C. or more from 250 C (Z 770 F.) V
Q CORRECTION TABLE FOR` TEMPERATURES BELOW AND ABOVE
` · 250 C. (770 F.) _
. ‘ `   ` I
  , Centigrade readings ............ 150C 200C 250C \300C 350C
Fahrenheit " .,........ff 590F 680F 770 F S60}? 950F
· 110.6 107.8 105.0 102.0 1 98.8
 - 105.3 102.7 1000 97.1 94.1
..  100.0 97.6 95.0 922 89.4
94.8 92.4 90.0 87.4 84.7
· L · . 89.5 87.3 85.0 82.5 80.0
, · 84.2 A82.2 800 77.7 75.3
i 79.0 77.0 75.0 72.8 70.6 »
. · . 737 719 70.0 68.0/ 65.9
· 68 4 66.8 65.0 63.1 61.2
_ 63.2 61.6 60.0 58.3 565 ·
» ( 57.9 .56.5 55.0 53.4 51.1
· 52.7 51:4 50.0 48.6 84.7  
_ , The above table was compiled from Dr. A. M. Peter’s
0 correction table for carbon dioxid at different temperatures
and pressures, and is to be used as follows;
A thermometer placed near the apparatus is to be read A
when making a test. If the temperature is near 250 C
(::770 F) no corrections are to be made and the readings of
the graduated cylinder will give the correct percentages, .
, which are the same as the figures in the middle column of
the correction table. · . 1
lf, however, the temperature differs much from 250C
" ‘ (770F), the correct per cent will be found in the column
7 headed by the temperature closest to that at which the `
7 _ experiment was made, and on the same horizontal line with
the figure in the middle column corresponding to the observed
' reading for the water in the cylinder.
-, For example, if the temperature is close to 200 C(¤;680 F) ’_
_ and the column of water displaced by one gram of limestone
{ is 95%, then to get the per cent, locate 95% in the middle