210 
HINTS TO TBAVELLERS. 
In Table II. the multiplier corresponding to 69 ° is 1 * 082 , and 1*082 x 
8153 = 8821 (neglecting decimal fractions). 
In those rare cases where greater altitudes are dealt with than are 
included within the limits of the table, the traveller should allow 570 feet 
for the difference between 185 ° and 184 °; 572 feet for that between 184 ° 
and 183 °; 574 feet for the next interval, and so on. 
Table I. : * 
Boiling 
point 
Fahr. 
Altitude 
above level 
at which 
water boils 
at 212 0 
(temp, of in¬ 
termediate 
air being 
32 ° F.). 
Approxi¬ 
mate cor¬ 
responding 
height of 
aneroid or 
barometer. 
Boiling 
point 
Fahr. 
Altitude 
above level 
at which 
water boils 
at 212 0 
(temp, of in¬ 
termediate 
air being 
32° F.). 
Approxi¬ 
mate cor¬ 
responding 
height of 
aneroid or 
barometer. 
Boiling 
point 
Fahr. 
Altitude 
above level 
at which 
water boils 
at 212 0 
(temp, of in¬ 
termediate 
air being 
32° F.). 
Approxi¬ 
mate cor¬ 
responding 
height of 
aneroid or 
barometer. 
185*0 
14698 
17-048 
186-7 
13733 
17-690 
188*4 
12772 
18-353 
•i 
14641 
17-085 
•8 
13676 
17-729 
*5 
12716 
18-393 
•2 
14584 
17-122 
*9 
13620 
17-767 
•6 
12660 
18*432 
•5 
14528 
17-160 
187-0 
13563 
17-806 
*7 
12603 
18-472 
•4 
14471 
17*197 
•1 
13506 
17-844 
•8 
12547 
18-512 
*5 
14414 
17*255 
•2 
13450 
17-883 
*9 
12490 
18-552 
•6 
14557 
17-272 
*3 
13394 
17-922 
189-0 
; 12434 
18-592 
*7 
14?°° 
17*310 
*4 
133 37 
17-961 
•1 
12377 
18-632 
•8 
14244 
17*348 
*5 
13281 
18-000 
*2 
12321 
18-672 
•9 
14187 
17*385 
•6 
13224 
18-039 
*3 
12265 
18-712 
186-0 
14U0 
17-423 
*7 
13167 
18*078 
*4 
12209 
18-753 
• 1 
14075 
17-461 
•8 
13111 
18-117 
*5 
12153 
18*79? 
•2 
14017 
17-499 
*9 
13054 
18-156 
-•6 
12096 
18-833 
*3 
13960 
17*537 
188-0 
12998 
18-195 
*7 
12040 
18*874 
*4 
13903 
17*575 
•I 
12942 
18-235 
•8 
11984 
18-914 
*5 
13857 
17-614 
•2 
12885 
18-274 
*9 
11928 
18*955 
•6 
13790 
17-652 
*3 
12829 
18-314 
190-0 
11872 
1 
18-996 
* These extended Tables will give much facility to the traveller both in 
calculating altitudes, and in checking the index error of the aneroid, by means 
of the boiling-point thermometer. I have computed Table I. from Tables XXVI. 
and II., in the hypsometric series in. Guy of s collection. It did not seem worth 
while to correct the figures thence obtained for the slight excess of temperature, 
viz.: o°'oi5 Fahr. of the French boiling-point over that of the English. It is 
too small to be sensible in ordinary instruments, and it becomes totally un¬ 
important in determining differences of level, or changes in the index error of an 
aneroid.—F. Galton. 
