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METEOROLOGICAL TABLES,

OTHER TABLES USEFUL LN PRACTICAL METEOROLOGY.

PREPAKED BY ORDER OF THE SMITHSOOTAN INSTITUTION

ARNOLD GUYOT.

WASHINGTON:

PUBLISHED BY THE SMITHSONIAN INSTITUTION.

1852.CAMBRIDGE:

STEREOTYPED BY METCALF AND COMPANY,

PRINTERS TO THE UNIVBRSITT.TO PROF. JOSEPH HENRY,

Secretary the Smithsonian Institution.of

—Sir,

In compliance with your instructions, I have prepared the collection of

Meteorological Tables contained in the following pages. I have en-

deavored to render it to the observers engaged in the sys-useful, not only

tem of Meteorological Observations now in operation tinder the direction

of the Smithsonian Institution, forwhom it was immediately designed,but

also to any Meteorologist who may desire to compare and to work out

portions of the vast Observations already ac-amount of Meteorological

cumulated in the stores of science.

The reduction of the observations and the extensive comparisons, with-

out which Meteorology can do but little, require an amount of mechanical

labor which renders it impossible for most observers to deduce for them-

selves the results of their own observations. The difficulty is still further

increased by the diversity of the thermometrical and barometrical scales

which Meteorologists, faithful to old habits rather than to science and to

reason, choose to retain, notwithstanding the additional labor they thus

gratuitously assume to themselves. To relieve the Meteorologist of a

great portion of this labor, by means of tables sufficiently extensive to

render calculations and even interpolations save hisunnecessary, is to

time and his forces in favor of science itself, and thus materially contribute

to its advancement. But most of the tables useful in Meteorology being

scattered through many volumes, which are often not of easy access, this

collection will be, it is hoped, acceptable to the friends of Meteorology,

and will supply a want very much felt in this department of the physicalmatter, I have been guided by the idea that theIn the selection of the

those most likely totables which I sought for my own use might also be

be wanted by others. But I wish the following to be considered as a

only the tables most appropriate to the presentfirst collection, containing

different and independent series,purpose. They are, therefore, arranged in

distinct paging, but constituting together a frame-work into whichwith

inserted when wanted, either to make the collec-any tables may be readily

calculated fromtion more complete, or to present a choice of tables some-

different elements, or adapted to various methods of calculation. ,what

heights by means of the barometer being inti-The measurement of

thought not inappropriate tomately connected with Meteorology, it was

admit into this collection Hypsometrical Tables, destined to render this kind

more easy and more rapid, and thus to increase the taste forof calculations

geography. I have preferred the tables ofa method so useful in physical

Delcros, as uniting in the greatest degree simplicity and accuracy. Those

Bessel, and Baily may be given afterwards.of Gauss,

directions for its use, when necessary ; moreover,Every table contains

indication of the elements used in its calculation, and of the sourcethe

has been taken. When no remark is made as to this lastfrom which it

expressly calculated for this volume in this casepoint, the table has been ;

tablemarked with an asterisk (*) in the general of contents.it is

Very respectfully,

Your obedient servant,

GUYOT.A.

Cambridge, Mass., December 15th, 1851.CONTENTS.

Meteorological Tables is composed of six different series of tables, each seriesThe collection of

paging running through the whole set, and to be found at the bottom of the pages.with a distinct

The figures at the head of the pages indicate the folios of each table for itself. In the following

series refer to the folio at the bottom ofthe page.table of contents, the figures in each

I.

TABLES.THERMOMETRICAL

the Thermometrical Scales.Comparison of

Scale with the Centigrade and Reau-Table I. Comparison of Fahrenheit's

-|-212° —39",mur's, full degrees, from to .... 5

" Centigrade Scale with Reaumur's and Fahren-II. Comparison of the

+100°heit's, full degrees, from to -1-50% ... 7

" Comparison of Reaumur's Scale with Fahrenheit's and the Centi-III.

+80''grade, full degrees, from to +40°, .... 7

" Conversion of Degrees of Fahrenheit into Centigrade Degrees,IV.*

—76°of a degree, from +122° to F., . 8for every tenth

" v.* Conversion of Degrees of Fahrenheit into Degrees of Reaumur,

—38°every tenth of a degree, from +122° to F., . .13for

" Degrees into Degrees of Fahrenheit,VI.* Conversion of Centigrade

—54°,for every tenth of a degree, from +50° to and from

100° +89° C, 17to+

" VII. Conversion of Centigrade Degrees into Degrees of Reaumur, for

—40°tenth of a degree, from +40° to C, . . 20every

" Degrees of Fahrenheit,VIII.* Conversion of Degrees of Reaumur into

—40°for every tenth of a degree, from +40° to R,, . .21VI CONTENTS.<

Tabt.e IX. Conversion of Degrees of Reaumur into Centigrade Degrees, for

40°every tenth of a degree, from -[-40° to— R., . . .23

" X.* Value of any Number of Degrees of Fahrenheit in Centigrade

Degrees, 24

" any Number of Degrees ofXL* Value of Fahrenheit in Degrees of

Reaumur, .......... 24

" Value of any Number of CentigradeXII.* Degrees in Degrees of

Reaumur, 24

" Number of CentigradeXIII.* Value of any Degrees in Degrees of Fah-

renheit, .......... 25

" of Number of Degrees of ReaumurXIV.* Value any in Centigrade

Degrees, 25

" of any Number of Degrees of Reaumur inXV.* Value Degrees of

Fahrenheit, ......... 25

II.

HYGROMETRICAL TABLES.

Forces ofAqueous Vapors, by Regnault,Table [. Elastic ... 6

" Elastic Forces of by August,II. 8

" Psychrometrical Tables for deducing the Force111. ofVapor, and the

Relative Humidity from the Indications of the Psychrometer,

or Wet-Bulb Hygrometer, by T. Haeghens, . . . .13

" For deducing the Relative Humidity expressed in Hundredths,IV.

from the Indications of Dew-Point Instruments, by T. Haeghens, 29

" deducing the Relative Humidity expressedV. For in Hundredths,

Indications of Saussure'sfrom the Hair-Hygrometer, by T.

Haeghens, 35

APPENDIX.

Comparing the Quantities Rain-Water.Tablesfor of

into EnglishConversion of Centimetres Inches, . . . .40Table I.*

" of into Paris or French Inches and Lines, 40II.*

" English Inches into Centimetres,III.* Conversion of . . . 41

" of Inches into Paris or French Inches andIV.*

Lines, 41