| - 4 | +15 | +13 | +22 |
| 4 | -20 | -23 | - 8 | 0 | +15 | + 5 | -12 | + 7 | + 4 | +13 |
| 5 | -34 | -39 | -24 | -15 | 0 | - 9 | -26 | - 8 | -10 | - 2 |
| 6 | -25 | -29 | -13 | - 5 | + 9 | 0 | -17 | + 2 | - 1 | + 8 |
| 7 | - 7 | -12 | + 4 | +12 | +26 | +17 | 0 | +19 | +16 | +26 |
| 8 | -26 | -31 | -15 | - 7 | + 8 | - 2 | -19 | 0 | - 3 | + 6 |
| 9 | -23 | -28 | -13 | - 4 | +10 | + 1 | -16 | + 3 | 0 | + 9 |
| 10 | -32 | -37 | -22 | -13 | + 2 | - 8 | -26 | - 6 | - 9 | 0 |
+------------+------+------+------+------+------+------+------+------+------+------+
| Error of | | | | | | | | | | |
| step. | -17.3| -22.0| - 6.4| + 1.9| +16.7| + 7.1| -10.1| + 8.9| + 6.1| +15.1|
+------------+------+------+------+------+------+------+------+------+------+------+
|Corrections.| +17.3| +39.3| +45.7| +43.8| +27.1| +20.0| +30.1| +21.2| +15.1| 0|
+------------+------+------+------+------+------+------+------+------+------+------+

The advantages of this method are the simplicity and symmetry of the
work of reduction, and the accuracy of the result, which exceeds that
of the Gay Lussac method in consequence of the much larger number of
independent observations. It may be noticed, for instance, that the
correction at point 5 is 27.1 thousandths by the complete calibration,
which is 2 thousandths less than the value 29 obtained by the Gay
Lussac method, but agrees well with the value 27 thousandths obtained
by taking only the first and last observations with the thread of 5
deg. The disadvantage of the method lies in the great number of
observations required, and in the labour of adjusting so many
different threads to suitable lengths. It is probable that
sufficiently good results may be obtained with much less trouble by
using fewer threads, especially if more care is taken in the
micrometric determination of their errors.

The method adopted for dividing up the fundamental interval of any
thermometer into sections and steps for calibration may be widely
varied, and is necessarily modified in cases where auxiliary bulbs or
"ampoules" are employed. The Paris mercury-standards, which read
continuously from 0 deg. to 100 deg. C., without intermediate