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274
"In reply to your letter of the 2nd instant, I am of
opinion that Mersal non-slip powder and Dusmo cannot have
an injurious effect on the wood floors; nor can Mersal be
injurious, provided it is not used sufficiently frequently to
unduly soften the wood.
"Frequent washing has an extremely injurious effect
upon block floors, causing the blocks to swell, shrink, work
loose and splinter."
Accumulation of Greasy Dirt.
As to the question of the accumulation of greasy dirt
on the surface, which is one of the main disadvantages of
oily preparations, it would appear from the replies of the
Head Teachers that this can be minimised by the application
of smaller quantities of the oily preparation.
In addition, it is recommended that the quantities used
should be applied mainly where the preparation has been
worn off.
Vacuum Cleaning Apparatus.
I may say that I have experimented respecting the
removal of the accumulations of greasy dirty with a Portable
Electric Vacuum Cleaning Apparatus, at one of the
schools for a week, but the opinion of the head teacher, the
caretaker, and myself was that this apparatus was not of
sufficient power to be of use for school purposes.
For some time back I have been in communication with
another firm as to a Fixed Electric Vacuum Cleaner, but
as this firm has German associations I am unable to proceed
further in the matter.
General Opinion and Conclusions.
The general opinion from the evidence which I have
accumulated from head teachers appears to be:—