which vibrates seconds, put p = 2[Pi], T = 81, [rho] = 1, n =
2. Thus a = 2.54 cms., or one inch very nearly.]

TABLES OF SURFACE-TENSION

In the following tables the units of length, mass and time are the
centimetre, the gramme and the second, and the unit of force is that
which if it acted on one gramme for one second would communicate to it a
velocity of one centimetre per second:--

_Table of Surface-Tension at 20 deg. C. (Quincke)._

+----------------------------------+---------+----------------------------+---------------------------------------+
| | | Tension of surface | Angle of contact with |
| Liquid. | Specific| separating the liquid from | glass in presence of |
| | Gravity.+-------+---------+----------+-------------+------------+------------+
| | | Air. | Water. | Mercury. | Air. | Water. | Mercury. |
+----------------------------------+---------+-------+---------+----------+-------------+------------+------------|
| Water | 1 | 81 | . . | 418 | 25 deg. 32' | . . | 25 deg. 6' |
| Mercury | 13.5432 | 540 | 418 | . . | 51 deg. 8' | 26 deg. 8' | . . |
| Bisulfuride of Carbon | 1.2687 | 32.1 | 41.75 | 372.5 | 32 deg. 16' | 15 deg. 8' | . . |
| Chloroform | 1.4878 | 30.6 | 29.5 | 399 | . . | . . | . . |
| Alcohol | 0.7906 | 25.5 | . . | 399 | 25 deg. 12' | . . | . . |
| Olive Oil | 0.9136 | 36.9 | 20.56 | 335 | 21 deg. 50' | 17 deg. | 47 deg. 2' |
| Turpentine | 0.8867 | 29.7 | 11.55 | 250.5 | 37 deg. 44' | 37 deg. 44'| 47 deg. 2' |
| Petroleum | 0.7977 | 31.7 | 27.8 | 284 | 36 deg. 20' | 42 deg. 46'| . . |
| Hydrochloric Acid | 1.1 | 70.1 | . . | 377 | . . | 42 deg. 46'| . . |
| Solution of Hyposulphite of Soda | 1.1248 | 77.5 | . . | 442.5 | 23 deg. 20' | . . | 10 deg. 42'|
+----------------------------------+---------+-------+---------+----------+-------------+------------+------------+

Olive Oil and