TABLE II.

Bar.
Height. 		 Log. 
22003.34242
01.34262
02.34282
03.34301
04.34321
05.34341
06.34361
07.34380
08.34400
09.34420
10.34439
11.34459
12.34479
13.34498
14.34518
15.34537
16.34557
17.34577
18.34596
19.34616
20.34635
21.34655
22.34674
23.34694
24.34713
25.34733
26.34753
27.34772
28.34792
29.34811
30.34830
31.34850
32.34869
33.34889
34.34908
35.34928
36.34947
37.34967
38.34986
39.35005
40.35025
41.35044
42.35064
43.35083
44.35102
45.35122
46.35141
47.35160
48.35180
49.35199
50.35218
51.35238
52.35257
53.35276
54.35295
55.35315
56.35334
57.35353
58.35372
59.35392
60.35411
61.35430
62.35449
63.35468
64.35488
65.35507
66.35526
67.35545
68.35564
69.35583
70.35603
71.35622
72.35641
73.35660
74.35679
75.35698
76.35717
77.35736
78.35755
79.35774
80.35793
81.35813
82.35832
83.35851
84.35870
85.35889
86.35908
87.35927
88.35946
89.35965
90.35984
91.36003
92.36021
93.36040
94.36059
95.36078
96.36097
97.36116
98.36135
99.36154
23003.36173
01.36192
02.36211
03.36229
04.36248
05.36267
06.36286
07.36305
08.36324
09.36342
10.36361
11.36380
12.36399
13.36418
14.36436
15.36455
16.36474
17.36493
18.36511
19.36530
20.36549
21.36568
22.36586
23.36605
24.36624
25.36642
26.36661
27.36680
28.36698
29.36717
30.36736
31.36754
32.36773
33.36791
34.36810
35.36829
36.36847
37.36866
38.36884
39.36903
40.36922
41.36940
42.36959
43.36977
44.36996
45.37014
46.37033
47.37051
48.37070
49.37088
50.37107
51.37125
52.37144
53.37162
54.37181
55.37199
56.37218
57.37236
58.37254
59.37273
60.37291
61.37310
62.37328
63.37346
64.37365
65.37383
66.37401
67.37420
68.37438
69.37457
70.37475
71.37493
72.37511
73.37530
74.37548
75.37566
76.37585
77.37603
78.37621
79.37639
80.37658
81.37676
82.37694
83.37712
84.37731
85.37749
86.37767
87.37785
88.37803
89.37822
90.37840
91.37858
92.37876
93.37894
94.37912
95.37931
96.37949
97.37967
98.37985
99.38003
24003.38021
01.38039
02.38057
03.38075
04.38093
05.38112
06.38130
07.38148
08.38166
09.38184
10.38202
11.38220
12.38238
13.38256
14.38274
15.38292
16.38310
17.38328
18.38346
19.38364
20.38382
21.38399
22.38417
23.38435
24.38453
25.38471
26.38489
27.38507
28.38525
29.38543
30.38561
31.38579
32.38596
33.38614
34.38632
35.38650
36.38668
37.38686
38.38703
39.38721
40.38739
41.38757
42.38775
43.38792
44.38810
45.38828
46.38846
47.38863
48.38881
49.38899
50.38917
51.38934
52.38952
53.38970
54.38987
55.39005
56.39023
57.39041
58.39058
59.39076
60.39094
61.39111
62.39129
63.39146
64.39164
65.39182
66.39199
67.39217
68.39235
69.39252
70.39270
71.39287
72.39305
73.39322
74.39340
75.39358
76.39375
77.39393
78.39410
79.39428
80.39445
81.39463
82.39480
83.39498
84.39515
85.39533
86.39550
87.39568
88.39585
89.39602
90.39620
91.39637
92.39655
94.39672
94.39690
95.39707
96.39724
97.39742
98.39759
99.39777
25003.39794
01.39811
02.39829
03.39846
04.39863
05.39881
06.39898
07.39915
08.39933
09.39950
10.39967
11.39985
12.40002
13.40019
14.40037
15.40054
16.40071
17.40088
18.40106
19.40123
20.40140
21.40157
22.40175
23.40192
24.40209
25.40226
26.40243
27.40261
28.40278
29.40295
30.40312
31.40329
32.40346
33.40364
34.40381
35.40398
36.40415
37.40432
38.40449
39.40466
40.40483
41.40500
42.40518
43.40535
44.40552
45.40569
46.40586
47.40603
48.40620
49.40637
50.40654
51.40671
52.40688
53.40705
54.40722
55.40739
56.40756
57.40773
58.40790
59.40807
60.40824
61.40841
62.40858
63.40875
64.40892
65.40909
66.40926
67.40943
68.40960
69.40976
70.40993
71.41010
72.41027
73.41044
74.41061
75.41078
76.41095
77.41111
78.41128
79.41145
80.41162
81.41179
82.41196
83.41212
84.41229
85.41246
86.41263
87.41280
88.41296
89.41313
90.41330
91.41347
92.41364
93.41380
94.41397
95.41414
96.41430
97.41447
98.41464
99.41481
26003.41497
01.41514
02.41531
03.41547
04.41564
05.41581
06.41597
07.41614
08.41631
09.41647
10.41664
11.41681
12.41697
13.41713
14.41731
15.41747
16.41764
17.41781
18.41797
19.41814
20.41831
21.41847
22.41863
23.41880
24.41896
25.41913
26.41929
27.41946
28.41963
29.41979
30.41996
31.42012
32.42029
33.42045
34.42062
35.42078
36.42095
37.42111
38.42127
39.42144
40.42160
41.42177
42.42193
43.42210
44.42226
45.42243
46.42259
47.42275
48.42292
49.42308
50.42325
51.42341
52.42357
53.42374
54.42390
55.42406
56.42423
57.42439
58.42455
59.42472
60.42488
61.42504
62.42521
63.42537
64.42553
65.42570
66.42586
67.42602
68.42619
69.42635
70.42651
71.42667
72.42684
73.42700
74.42716
75.42732
76.42749
77.42765
78.42781
79.42797
80.42813
81.42830
82.42846
83.42862
84.42878
85.42894
86.42911
87.42927
88.42943
89.42959
90.42975
91.42991
92.43008
93.43024
94.43040
95.43056
96.43072
97.43088
98.43104
99.43120
27003.43136
01.43152
02.43169
03.43185
04.43201
05.43217
06.43233
07.43249
08.43265
09.43281
10.43297
11.43313
12.43329
13.43345
14.43361
15.43377
16.43393
17.43409
18.43425
19.43441
20.43457
21.43473
22.43489
23.43505
24.43521
25.43537
26.43553
27.43569
28.43584
29.43600
30.43616
31.43632
32.43648
33.43664
34.43680
35.43696
36.43712
37.43727
38.43743
39.43759
40.43775
41.43791
42.43807
43.48823
44.43838
45.43854
46.43870
47.43886
48.43902
49.43917
50.43933
51.43949
52.43965
53.43981
54.43996
55.44012
56.44028
57.44044
58.44059
59.44075
60.44091
61.44107
62.44122
63.44138
64.44154
65.44170
66.44185
67.44201
68.44217
69.44232
70.44248
71.44264
72.44279
73.44295
74.44311
75.44326
76.44342
77.44358
78.44373
79.44389
80.44404
81.44420
82.44436
83.44451
84.44467
85.44483
86.44498
87.44514
88.44529
89.44545
90.44560
91.44576
92.44592
93.44607
94.44623
95.44638
96.44654
97.44669
98.44685
99.44700
28003.44716
01.44731
02.44747
03.44762
04.44778
05.44793
06.44809
07.44824
08.44840
09.44855
10.44871
11.44886
12.44902
13.44917
14.44932
15.44948
16.44963
17.44979
18.44994
19.45010
20.45025
21.45040
22.45056
23.45071
24.45086
25.45102
26.45117
27.45133
28.45148
29.45163
30.45179
31.45194
32.45209
33.45225
34.45240
35.45255
36.45271
37.45287
38.45301
39.45317
40.45332
41.45347
42.45362
43.45378
44.45393
45.45408
46.45423
47.45439
48.45454
49.45469
50.45484
51.45500
52.45515
53.45530
54.45545
55.45561
56.45576
57.45591
58.45606
59.45621
60.45637
61.45652
62.45667
63.45682
64.45698
65.45712
66.45728
67.45743
68.45758
69.45773
70.45788
71.45803
72.45818
73.45834
74.45849
75.45864
76.45879
77.45894
78.45909
79.45924
80.45939
81.45954
82.45969
83.45984
84.46000
85.46015
86.46030
87.46045
88.46060
89.46075
90.46090
91.46105
92.46120
93.46135
94.46150
95.46165
96.46180
97.46195
98.46210
99.46225
29003.46240
01.46255
02.46270
03.46285
04.46300
05.46315
06.46330
07.46344
08.46859
09.46374
10.46389
11.46404
12.46419
13.46434
14.46449
15.46464
16.46479
17.46494
18.46509
19.46523
20.46538
21.46553
22.46568
23.46583
24.46598
25.46613
26.46627
27.46642
28.46657
29.46672
30.46687
31.46702
32.46716
33.46731
34.46746
35.46761
36.46776
37.46790
38.46805
39.46820
40.46835
41.46849
42.46864
43.46879
44.46894
45.46909
46.46923
47.46938
48.46953
49.46967
50.46982
51.46997
52.47012
53.47026
54.47041
55.47056
56.47070
57.47085
58.47100
59.47114
60.47129
61.47144
62.47159
63.47176
64.47188
65.47202
66.47217
67.47232
68.47246
69.47261
70.47276
71.47290
72.47305
73.47319
74.47334
75.47349
76.47363
77.47378
78.47392
79.47407
80.47422
81.47436
82.47451
83.47465
84.47480
85.47494
86.47509
87.47524
88.47538
89.47553
90.47567
91.47582
92.47596
93.47611
94.47625
95.47640
96.47654
97.47669
98.47683
99.47698
30003.47712
01.47727
03.47741
03.47755
04.47770
05.47784
06.47799
07.47813
08.47828
09.47842
10.47857
11.47871
12.47886
13.47900
14.47914
15.47929
16.47943
17.47958
18.47972
19.47986
20.48001
21.48015
22.48030
23.48044
24.48058
25.48073
26.48087
27.48101
28.48116
29.48130
30.48144
31.48159
32.48173
33.48187
34.48202
35.48216
36.48230
37.48244
38.48259
39.48273
40.48287
41.48302
42.48316
43.48330
44.48344
45.48359
46.48373
47.48387
48.48402
49.48416
50.48430
51.48444
52.48458
53.48473
54.48487
55.48501
56.48515
57.48530
58.48544
59.48558
60.48572
61.48586
62.48601
63.48615
64.48629
65.48643
66.48657
67.48671
68.48686
69.48700
70.48714
71.48728
72.48742
73.48756
74.48770
75.48785
76.48799
77.48813
78.48827
79.48841
80.48855
81.48869
82.48883
83.48897
84.48911
85.48926
86.48940
87.48954
88.48968
89.48982
90.48996
91.49010
92.49024
93.49038
94.49052
95.49066
96.49080
97.49094
98.49108
99.49122
3100.49136

TABLE III.
BAROMETRIC READINGS IN MILLIMETERS.—
ALTITUDES IN METERS.

This is from Radau’s table. The formula for calculation of difference of altitude of two stations is

in which D is the difference of height in meters, h and h' are barometer readings in millimeters and t and t' are the temperatures in centigrade degrees.

Mill. Meters.
5003365.4
5013349.4
5023333.5
5033317.6
5043301.7
5053285.9
5063270.1
5073254.3
5083238.5
5093222.8
5103207.1
5113191.5
5123175.9
5133160.3
5143144.7
5153129.2
5163113.7
5173098.2
5183082.8
5193067.4
5203052.0
5213036.6
5223021.3
5233006.0
5242990.7
5252975.5
5262960.3
5272945.1
5282930.0
5292914.9
5302899.8
5312884.7
5322869.7
5332854.7
5342839.7
5352824.7
5362809.8
5372794.9
5382780.0
5392765.2
5402750.4
5412735.6
5422720.9
5432706.1
5442691.4
5452676.8
5462662.1
5472647.5
5482632.9
5492618.3
5502603.8
5512589.3
5522574.8
5532560.3
5542545.9
5552531.5
5562517.1
5572502.7
5582488.4
5592474.1
5602459.8
5612445.6
5622431.4
5632417.2
5642403.0
5652388.8
5662374.7
5672360.6
5682346.5
5692332.5
5702318.4
5712304.4
5722290.4
5732276.5
5742262.6
5752248.7
5762234.8
5772220.9
5782207.1
5792193.3
5802179.5
5812165.7
5822152.0
5832138.3
5842124.6
5852110.9
5862097.3
5872083.7
5882070.1
5892056.5
5902042.9
5912029.4
5922015.9
5932002.4
5941989.0
5951975.5
5961962.1
5971948.7
5981935.4
5991922.0
6001908.7
6011895.4
6021882.1
6031868.8
6041855.6
6051842.4
6061829.2
6071816.0
6081802.9
6091789.8
6101776.7
6111763.6
6121750.5
6131737.5
6141724.4
6151711.4
6161698.5
6171685.5
6181672.6
6191659.7
6201646.8
6211633.9
6221621.0
6231608.2
6241595.4
6251582.6
6261569.8
6271557.1
6281544.4
6291531.7
6301519.0
6311506.3
6321493.7
6331481.0
6341468.4
6351455.8
6361443.3
6371430.7
6381418.2
6391405.7
6401393.2
6411380.7
6421368.3
6431355.8
6441343.4
6451331.0
6461318.7
6471306.3
6481294.0
6491281.7
6501269.4
6511257.1
6521244.8
6531232.6
6541220.4
6551208.2
6561196.0
6571183.8
6581171.7
6591159.5
6601147.4
6611135.3
6621123.3
6631111.3
6641099.2
6651087.2
6661075.2
6671063.2
6681051.2
6691039.3
6701027.3
6711015.4
6721003.5
673991.7
674979.8
675968.0
676956.1
677944.3
678932.6
679920.8
680909.0
681897.3
682885.6
683873.9
684862.2
685850.5
686838.9
687827.3
688815.6
689804.0
690792.5
691780.9
692769.3
693757.8
694746.3
695734.8
696723.3
697711.9
698700.4
699689.0
700677.6
701666.2
702654.8
703643.4
704632.1
705620.7
706609.4
707598.1
708586.8
709575.6
710564.3
711553.1
712541 8
713530.6
714519.5
715508.3
716497.1
717486.0
718474.8
719463.7
720452.6
721441.6
722430.5
723419.4
724408.4
725397.4
726386.4
727375.4
728364.4
729353.5
730342.5
731331.6
732320.7
733309.8
734298.9
735288.0
736277.2
737266.3
738255.5
739244.7
740233.9
741223.1
742212.3
743201.6
744190.8
745180.1
746169.4
747158.7
748148.0
749137.4
750126.7
751116.1
752105.5
753 94.9
754 84.3
755 73.7
756 63.1
757 52.6
758 42.0
759 31.5
760 21.0
761 10.5
762 0.0
763-10.5
764-20.9
765-31.4
766-41.8
767-52.2
768-62.6
769-73.0
770-83.4
771-93.7
772-104.1
773-114.4
774-124.7
775-135.0
776-145.3
777-155.6
778-165.9
779-176.1
780-186.4

In comparing the Aneroid with a Mercurial Barometer, correct the latter by the following table, subtracting the corrections.

TABLE IV.
REDUCTION OF MERCURIAL
COLUMN TO 32° FAHR.

Brass scale to barometer correct at 62° Fahr.

Temp.
°F.		 30” 25” 20”
32 .009 .008 .006
35 .017 .015 .012
40 .031 .026 .021
45 .044 .037 .030
50 .058 .048 .038
55 .071 .059 .047
60 .084 .070 .056
65 .098 .082 .065
70 .111 .093 .074
75 .125 .104 .083
80 .138 .115 .092
85 .151 .126 .101
90 .164 .137 .110
95 .178 .148 .118
100  .191 .159 .127

TABLE V.
BAROMETRIC PRESSURES CORRESPONDING
TO BOILING WATER TEMPERATURES.

Whole Deg. Tenths of each Degree.
.0 .2 .4 .6 .8
in. in. in. in. in.
183 16.317 16.389 16.461 16.533 16.605
184 16.618 16.752 16.826 16.900 16.974
185 17.048 17.122 17.197 17.272 17.348
186 17.423 17.499 17.575 17.652 17.729
187 17.806 17.883 17.961 18.039 18.117
188 18.195 18.274 18.353 18.432 18.512
189 18.592 18.672 18.753 18.833 18.914
190 18.996 19.077 19.159 19.241 19.324
191 19.407 19.490 19.573 19.657 19.741
192 19.825 19.910 19.995 20.080 20.166
193 20.251 20.338 20.424 20.511 20.598
194 20.685 20.773 20.861 20.949 21.038
195 21.126 21.216 21.305 21.395 21.485
196 21.576 21.666 21.758 21.849 21.941
197 22.033 22.125 22.218 22.311 22.404
198 22.498 22.592 22.686 22.781 22.876
199 22.971 23.067 23.163 23.259 23.356
200 23.453 23.550 23.648 23.746 23.845
201 23.943 24.042 24.142 24.241 24.341
202 24.442 24.542 24.644 24.745 24.847
203 24.949 25.051 25.154 25.257 25.361
204 25.465 25.569 25.674 25.779 25.884
205 25.990 26.096 26.202 26.309 26.416
206 26.523 26.631 26.740 26.848 26.957
207 27.066 27.176 27.286 27.397 27.507
208 27.618 27.730 27.842 27.954 28.067
209 28.180 28.293 28.407 28.521 28.636
210 28.751 28.866 28.982 29.098 29.215
211 29.331 29.449 29.566 29.684 29.803
212 29.922 30.041 30.161 30.281 30.401

Transcriber’s Notes:

The cover image was created by the transcriber, and is in the public domain.

The illustrations have been moved so that they do not break up paragraphs and so that they are next to the text they illustrate.

Typographical and punctuation errors have been silently corrected.