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TABLE II.-FOR CONVERTING MILLIMETRES INTO ENGLISH

INCHES AND DECIMALS.
A millimetre equals 0.03937079 English inch.

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661 26.024 || 687 27.048 713 28.071 | 739 29.095 | 765 30.119 662/ 26.063 688 27.087 714 28.111 740 29.134 || 766 30.158 663 26.103 | 689 27.126 || 715 28.150 || 741 29.174 || 767 30.197 664 26.142 | 690 | 27.166 | 716 28.189 | 742 29.213 || 768 30.237 665 26.182 691 27.205 || 717 28.229 || 743 29.252 || 769 30.276 666 26.221 692 27.245 718 28.268 || 744 29.292 | 77030.316 667 26.260 693 27.284 || 719 28.308 || 745 29.331 771 30.355 668 26.300 694 27.323 | 720 28.347 || 746 29.371 | 772 30.394 669 26.339 | 695 27.363 | 721 28.386 747 29.410 || 773 30.434 670) 26.378 696 27.402 || 722 28.426 | 748 29.449 | 774 30.473 671 | 26.418 697 27.441 || 723 28.465 | 749 29.489 || 775 30.512 672 26.457 698 27.481 724 28.504 | 750 29.528 || 776! 30.552 673 26.497 699 27.520 | 725 28.544 | 751 29.567 || 777 30.591 674 26.536 700 27.560 i 726 28.583 752 29.607 | 778 30.630 675 26.575 701 27.599 || 727! 28.623 753 29.646 | 779 30.670 676 26.615 || 702 27.638 728 28.662 || 754 29.686 || 780 30.709 677 26.654 || 703 27.678 || 729 28.701 || 755 29.725 | 781 30.749 678 26.693 704 27.717 || 730 28.741 756 29.764 | 782 30.788 679 26.733 705 27.756 || 731 28.780 | 757 29.804 783 30.827 680 26.772 706 27.796 732 28.819 758 29.843 | 784 30.867 681 26.812 707 27.835 || 733 28.859 759 | 29.882 || 785 30.906 682 26.851 708 27.875 | 734 28.898 760 29.922786 30.945 683 26.890 709 27.914 || 735 28.938 || 761 29.961 || 787 30.985 684 26.930 710 27.953 736 28.977 | 762 30.001 || 788 31.024 685 26.969 711 27.993 | 737 29.016 | 763 30.040 || 789 31.064 686 27.008 712 28.032 || 738 29.056 | 764 30.079 || 790 31.103

TENTHS OF A MILLIMETRE IN THE DECIMAL OF AN INCH.

0 1 | 2 3 | 4 | 5 6 7 8 9 0.000 0.0040.008 0.012 0.016 0.020 0.024 0.028 0.031 0.035

TABLE III.-FOR CONVERTING FRENCH OR PARIS LINES

INTO ENGLISH INCHES.

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288.0 289.5 289.0 289.5 290.0 290.5 291.0 291.5 292.0 292.5 293.0 293.5 294.0 294.5 295.0 295.5 296.0 296.5 297.0 297.5 298.0 298.5 299.0 299.5

25.578 25.623 25.667 25.712 25.756 25.800 25. 845 25.889 25.934 25.978 26.023 26.067 26.111 26.156 26.200 26.245 26, 289 26.333 26.378 26.422 26.467 26.511 26.555 26.600

300.0 300.5 301.0 301.5 302.0 302.5 803.0 303.5 304.0 304.5 305.0 305.5 306.0 306.5 307.0 307.5 308.0 308.5 309.0 309.5 310.0 310.5 311.0 311.5

26.644 26.689 26.733 26.777 26.822 26.866 26.911 26.955 26.999 27.044 27.088 27.133 27.177 27.221 27.266 27.310 27.855 27.399 27.444 27.488 27.532 27.577 27.621 27.666

312.0 27.710
312.5

27.754
313.0 27.799
313.5 27.843
314.0 27.888
314.5 27.932
315.0 27.976
315.5 28.021
316.0 28. 005
316.5

1

28.110 317.0 28.154 317.5 28.198 318.0 28.243 318.5 28.287 819.0 28.332 319.5 28.376 320 0 28.420 820.5 28.465 321.0 28.509 321.5 28.554 322.0 28.598 322.5 28.643 323.0 28.687 323.5 28.731

324.0 324.5 325.0 325.5 326.0 326.5 327.0 327.5 328.0 328.5 329.0 329.5 330.0 330.5 331.0 331.5 332.0 332.5 333.0 333.5 334.0 334.5 335.0 335.5

28. 776 28.820 28.865 28.909 28.953 28.998 29.042 29.087 29.131 29.175 29.220 29.264 29.309 29.353 29.397 29.442 29.486 29.531 29.575 29.619 29.664 29.708 29.753 29.797

336.0 336.5 337.0 337.5 338.0 338.5 339.0 339.5 340.0 340.5 341.0 341.5 342.0 342.5 343.0 343.5 344.0 344.5 345.0 345.5 346.0 946.5 347.0 347.5

29.842 29.886 29.930 29.975 30.019 30.064 30.108 30.152 30. 197 80.241 30.286 30.330 30.374 30.419 30.463 30.508 30.552 30.596 30.641 30.685 30.730 30.774 30.818 30.863

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[blocks in formation]

26

.014 .015 .016 .017 .018

.023 .024 025 .026 .027

032 .033 .034 .035 .036

.041 .042 .043 .044 .045

7 8 9 10

005 .006 .007 .008 .009

16 17 18 19 20

36 87 38 39 40

46 47 48 49 50

29 30

TABLE IV.-FOR REDUCING BAROMETRIC OBSERVATIONS TO THE

LEVEL OF THE SEA; AND CONVERSELY, FOR THE DETERMINATION OF HEIGHTS BY THE BAROMETER.

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.229

.239 .250 .261 .272

.284

210 220 230 240 250 260 270 280 290 800

.256 .268 .280 .292 .305 .316 .328 .340 .353 .365

.250 262 273 .285 .297 .309 .320 .332 .344 .356

.245 .256 .268 .279 .290 .302 .313 .325 .336 .348

.234 .245 .255 . 266 .278 .289 .299 .310 .322 .333

.224 .235 .245 .256 .266 .277 .287 .298 .308 .319

.240 .250 .261 .272 .283 .293 .304 .315 .326

.219 .230 .240 .250 .260 .271 .281 .291 .302 .312

.215 .225 .235 .245 .255 .265 .275 .285 .296 .306

.295 .306 .317 .329 .340

.211 .221 .231 .241 .250 .260 .270 .280

.008 .008 .008 .009 .009 .009 .010 .010 .010 .011

.290

.300

310 320 330 340 350 360 370 380 390 400

.377 .389 .401 .413 .425 .438 .450 .462 .474 .486

.368 .380 .391 .403 .415 .427 .439 .451 .463 .475

.360 .372 .383 .394 .406 .417 .429 .440 .452 .464

.352
.363
.374
.385
.397
.408
.419
.430
.442
.453

.34+ .337
.355 .348
.366 .358
.377 .369
.388

.380
.399

.390 .410 .401 .421

.412 .432: .422 .443 .433

.329 .340 .350 .361 .371 .382 .392 .402 .413 .424

322 .333 .343 .354 .364 .374 .884 .394 .405 415

.316 .326 .336 .346 .356 .366 .376 .386 .396

.310 .320 .329 .339 .349 .359 .369 .378 ,388 .398

.011 .012 .012 .012 .013 .013 .013 .014 .014 .014

.407

.487

.434

.498

410 420 430 440 450 460 470 480 490 500

.498 .510 .522 .534 .546 .558 .570 .581 .593 .605

.509 .521 .532 .544 .556 .568 .679 .591

.475 .486 .497 .509 .520 .532 .543 .555 .566 .577

.464 .475 .486 .497 .508 .520 .531 .542 .553 .564

.454 .465 .476 .487 .498 .509 .520 .530 .541 .551

.455 .465 .476 .487 .498 .508 .519 .629 .539

.455 .465 .476 .486 .497 .507 .518 .528

.425 .435 .446 .456 .466 .477 .487 .497 .507 .517

.417 .427 .437 .447 .457 .467 .477 .487 . 497 .507

.408 .418 .427

437 .447 .457 .467

.015 .015 .015 .016 .016 .017 .017 .018 .018 .018

.477

.486
.496

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.698
.707

720

.853 .865 .876 .888 .900 .911 .923 .935 .947 .959

.833 .844 .855 .867 .878 .889 .901 .913 .924 .936

.814 .824 .835 .846 .857 .868 .879 .891 .902 .914

.795 .805 .816 .826 .837 .848 .859 .870 .881 .893

.760 .770 .780 791 .801 .811 .822 .832 .843 .853

.743 .753 .763 .774 .784 .794 .804 .814 .825 .835

.728 .713
.738 .722
.748 .732
.758.742
.768 .752
.777 .761
.787 .771
.797.781
.807 .791
.817 .801

.025 .026 .026 .026 .027 .027 .027 .028 .028 .028

i

730 740 750 760 770 780 790 800

.787 .798 .808 .818 .829 .840 .851 .862 .873

.726 .736 .746 .755 .765 .775 .785

$10 820 830 840 850 860 870 880 890 900

.970 .947 .925 .904
.982 .958 .935 .914
.994
.970

.947 .925
1.005 .981 .958 .936
1.017 .992 .969 .947
1.028 1.003 .979 .957
1.040 ! 1.015 .991 .968
1.051 1.0261.002 .979
1.063 1.037 1.013 .990
1.075 1.049 1.024 1.001

883 .894 .904 915 .925 .936 .946 .957 .968 .979

.864 .874 .884 .895 .905 .915 .925 .936 .946 .957

.845
.855
.865
.876
.886
.896
.996
.916
.926
.936

.827 | .810
.837

.820
.847 | .830
.857 .839
.867 .849
.876 .858
.886.868
.896.877
.906.887
.916 .897

.794 .804 .813 .822 .831 .840 .850 .859 .869 .879

.029 .029 .029 .030 .030 .030 .031 .031 .032 .032

910 920 930 940 950 960 970 980 990 1000

1.086 1.060 1.035 1.012 .989 .967 .946 .926.906
1.098 1.071 1.046 1.022 .999 .977 .956 .985.916
1.109 | 1.082) 1.056 1.033 | 1.010 .988 .966 .945 .925
1.120 1.093 1.067 1.043 1.020 .998 .976 .955 .935
1.132 1.105 1.079 1.054 1.037 1.008 .986 .965.945
1.144 1.116 1.090 1.065 1.041 1.018 .996 .975.954
1.155 1.128 1.101 | 1.076 1.052 1.029 1.006 .985.964
1.167 1.139 1.112 1.087 1.063 1.040 | 1,017 .995.974
1.178 1.150 1.123 1.098 1.073 1.050 1.027 | 1.005.983
1.190 1.161 1.134 1.108 1.084 1.060 1.037 1.015 .993

.888
.897
.906
.916
.925
.995
.944
.954
.963
.972

.032 .033 .033 .033 .034 .034 .034 .035 .035 .035

TABLE V.-COMPARISON OF THE CENTIGRADE THERMOMETER WITH

FAHRENHEIT'S AND REAUMUR'S, GIVING THE CORRESPONDING VALUES FOR EACH DEGREE, FROM +50° TO —41° CENTIGRADE.

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50

[blocks in formation]

49

26

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8.2 2.4 1.6

48

25

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47

24

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46

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32.0

23 22

45

44

21

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--19 2.2 -15.2 --20 4.0-16.0 -21 - 5.8 -16.8 --22 - 7.6 -17.6 --23 - 9.4 -18.4 -24 -11.2 -19.2 -25

-13.0 -20.0 - 26 -14.8-20.8 -27 -16.6--21.6 -28 -18.4 -22.4 -29 - 20.2 - 23.2 -30 -22.0 24.0 -31 -23.8-24.8 --32-25.6 -25.6 -33 -27.4 --26.4 -34 - 29.2 -27.2 -35 -31.0-28.0

18 17

122.0 40.0 120.2 39.2 118.4 88.4 116.687.6 114.836.8 113.0 36.0 111.2 35.2 109.4 34.4 107.6 33.6 105.8 32.8 104.0 32.0 102.2 31.2 100.4 30.4 98.629.6 96.8 28.3 95.0 28.0 93.2 27.2 91.4 26.4 89.6 25.6 87.8 24.8 86.0 24.0 84.2 23.2

6

78.8 20.8
77.0 | 20.0
75.2 19.2
73.4 18.4
71.6 17.6
69.8 16.8
68.0 16.0
66.2 15.2
64.4 14.4
62.6 13.6
60.8 12.8
59.0 12.0
57.2 11.2
55.4 | 10.4
53.6 9.6
51.8 8.8
50.0

8.0
43.2 7.2
46.4

6.4 44.6 5.6

[blocks in formation]

0.0 30.2 0.8 28.4

-1.6 26.6

- 2.4 24.8 3.2 23.0 - 4.0 21.2 - 48 19.4 5.6 17.6

6.4 15.8 -7.2 14.0 8.0 12.2 -8.8 10.4 -9.6 8.6 -10.4 0.8 - 11.2 5.0-12.0 3.2 - 12.8

1.4-13.6 -0.4 -14.4

37

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Comparison of the Scales for each Tenth of a Degree.

[blocks in formation]
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