Friction of pine upon pine; the mean values of the
friction given in Table II. (corrected for the
friction of the pulley) compared with the formula
_F_ = 0·9 + 0·266 _R_.
+-----------+----------+---------+----------+-------------+
| | | | |Discrepancies|
| Number of | R. |Corrected| F. | between the |
|Experiment.|Total load| mean |Calculated| observed and|
| |on slide |value of |value of | calculated |
| | in lbs. |friction.| friction.| frictions. |
+-----------+----------+---------+----------+-------------+
| 1 | 14 | 4·7 | 4·6 | -0·1 |
| 2 | 28 | 8·2 | 8·3 | +0·1 |
| 3 | 42 | 12·2 | 12·1 | -0·1 |
| 4 | 56 | 15·8 | 15·8 | 0·0 |
+-----------+----------+---------+----------+-------------+
[Illustration: FIG. 33.]