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73
At the request of the Parks Committee a detailed report has been prepared
covering all the better known methods of purifying the water used in swimming
baths, and this will furnish data which may assist the Council when new open-air
swimming baths are constructed or alterations or additions are made to existing
pools.
Swimming
baths.
The visibility in all directions from the fleche of County Hall for 1935 was,
generally, about equal to the average for the five preceding years, September being,
however, considerably above the average for that month. Very low visibilities were
noted on several occasions during December, that of the 23rd being 55 yards. The
maximum visibilities for all months were high, especially in respect of February and
March. Observations taken from the sludge ships at places east of the Nore light
indicate that the visibility in the estuary is, on the whole, much better than from
County Hall.
Visibility.
The distance and direction of the furthest discernible object or objects on the
day of maximum visibility are given in fig. 1 and clearly show the preponderant
tendency towards the quadrant south to west.
The accompanying diagrams (figs. 1 and 2) present the summarised results
of all observations.