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ICE CREAM
Ice Cream is manufactured at two premises in the Borough. During the year thirty-two samples were taken
lor bacteriological examination and the Methylene Blue Test by the Public Health Laboratory Services. The
Methylene Blue Test is recommended by the Department of Health as a guide for ascertaining the
bacteriological cleanliness of ice cream. The time taken to decolourise the Methylene Blue is recorded, and the
samples graded as follows:-
Provisional Grade Time Taken to Decolourise
Methylene Blue
1 4 hours or more
2 2½ hours or more
3 ½ to 2 hours
4 less than half an hour
The thirty-two samples were placed in the following grades:-
Grade No. of Samples
1 11
2 4
3 6
4 11
Milk Supplies
There are two Milk processing Depots in the Borough, one of which is given over almost completely to the
production of milk products. In the case of the one where milk is processed, the assembly of the milk -just over
100,000 gallons per day is as heretofore by road tanker and rail tanker. In this depot there are four H.T.S.T.
pasteurising plants in which milk is heated to, and retained at, a temperature of 161 degrees F. for fifteen
seconds, and then cooled to below 50 degrees F. in accordance with the Milk (Special Designation)
Regulations.
During the year experiments were carried out with a semi-portable refrigerated blower unit for connecting
to bulk milk bottle transporters in order that milk for transport to distribution depots in London, should leave
the plant at a temperature of 40 degrees F., such milk being transferred to refrigerated storage at the
distribution depots. The introduction of this type of low temperature to insulated vehicles, was successful, and
by the end of the year it was intended to bring the number of the refrigerated units for vehicle cooling, up to six.
An interesting feature of work at this plant is that between 4 and 500,000 bottles per week are needed to
replace bottles not returned through disapearance or breakage or rejection, because of misuse by the public.
At the milk products plant the processing of cream and the manufacture of yoghurt continue apace, and
bacteriological and chemical samples were taken from each of the above establishments.
244 premises were registered for the sale of milk and the number of licences in force at the end of the year
were as follows:-
Pasteurised 218
Sterilised 191
Un-treated 106
Ultra heat treated 145

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