he upper orifice of the furnace must be carefully made of considerable
dimensions, that the caloric produced may have free issue, lest the too
sudden expansion of that highly elastic fluid should produce a dangerous
explosion.

FINIS.

APPENDIX.

No. I.

TABLE _for Converting Lines, or Twelfth Parts of an Inch, and Fractions
of Lines, into Decimal Fractions of the Inch._

Twelfth Parts Decimal Decimal
of a Line. Fractions. Lines. Fractions.

1 0.00694 1 0.08333
2 0.01389 2 0.16667
3 0.02083 3 0.25000
4 0.02778 4 0.33333
5 0.03472 5 0.41667
6 0.04167 6 0.50000
7 0.04861 7 0.58333
8 0.05556 8 0.66667
9 0.06250 9 0.75000
10 0.06944 10 0.83333
11 0.07639 11 0.91667
12 0.08333 12 1.00000

No. II.

TABLE _for Converting the Observed Heighths of Water in the Jars of the
Pneumato-Chemical Apparatus, expressed in Inches and Decimals, into
Corresponding Heighths of Mercury._

Water. Mercury. Water. Mercury.

.1 .00737 4. .29480
.2 .01474 5. .36851
.3 .02201 6. .44221
.4 .02948 7. .51591
.5 .03685 8. .58961
.6 .04422 9. .66332
.7 .05159 10. .73702
.8 .05896 11. .81072
.9 .06633 12. .88442
1. .07370 13. .96812
2. .14740 14. 1.04182
3. .22010 15. 1.11525

No. III.

TABLE _for Converting the Ounce Measures used by Dr Priestly into French
and English Cubical Inches._

Ounce French cubical English cubical
measures. inches. inches.

1 1.567 1.898
2 3.134 3.796
3 4.701 5.694
4 6.268 7.592
5 7.835 9.490
6 9.402 11.388
7 10.969 13.286
8 12.536 15.184
9 14.103 17.082
10 15.670 18.980
20 31.340 37.960
30 47.010 56.940
40 62.680