APPENDIX.

Densities corresponding to Degrees of Baumé's Hydrometer for Liquids heavier than Water (Poggiale).

Degrees. Density. Degrees. Density. Degrees. Density. Degrees. Density.

Degrees. Density. Degrees. Density. Degrees. Density. Degrees. Density.

The degrees of Twaddell's hydrometer are readily converted into their corresponding specific gravities by multiplying them by 5, and adding 1000. The following is a short table of

16 386176 cubic centimetres.

100000 parts of gas at 32° F., 29'922 Bar. (also at 32°), become at 60° F.,

Bar. 30 inches (also at 60°) = 1'057007 parts.

I Kilometre

=

O'03937079

0'3937079

3'937079

39'37079

3*2808992

=

10936331

3937079 = 3280·8992 = 1093 6331

The length of the platinum metre is estimated at the temperature of 32° F.,

the English standard yard at 62° F.

I English inch is equal to 25'39954 millimetres.

To Reduce Grammes to Grains.
Log. grammes + 1884320 + 1 = log. grains.

To Reduce Cubic Centimetres to Cubic Inches.
Log. cubic centimetres + (7855224 — 2) = log. cubic inches.
To Reduce Millimetres to Inches.

Log. millimetres + ('5951741 − 2) = log. inches.

To Convert Grains into Grammes.

Log. grains +(8115680-2) = log. grammes.

To Convert Cubic Inches into Cubic Centimetres.
Log. cubic inches + 2144776 + 1 = log. cubic centimetres.

To Convert Inches into Millimetres.

Log. inches + 4048259 + 1 = log. millimetres.

This determination of the gramme was made from the kilogramme des Archives by Professor W. H. Miller, in fixing the national standards (Phil. Trans. 1856, 893).

The metre, at the time that its length was fixed by the French Government, was supposed to be a ten-millionth part of a quadrant of a meridian circle of the earth passing through Dunkirk and Barcelona. Subsequent more extended geodetic measurements have shown that it differs from this by about 4000 of its length. The standard platinum metre of Borda at o° C. is equal to 39 37079 of the English bronze standard yard at 62° F.

36

1=006102705 I = 35 215468
2 = #012205410 2 = 70.430936
3018308115 3=105646404 3
4024410820 4 140 861872 | 4=
5030513525 5

=

176 077340 5

=

=

I = 17607734 1=0·22009668 2 = 3'5215468 2=0°44019336 5:2823202 3066029004 70430936 4=088038672 8 80386705=110048340 6=0·36616230 6=211 292808 6 = 105646404 | 6 = 132058008 7042718935 7=246508276 7 12 325+138 7 154067676 8048821640 8=281723744 8 14 0861872 8-176077344 9=0'54924345 9-316-939212 9158469606 | 9=198087012 The capacity of a litre is that of a cube each side of which is a decimetre.

=

=

English to Metrical.

=

The weight of a gramme is that of a cubic centimetre of distilled water at 4° C. (39°2 F.)

English to Metrical.

687