A Beek of the Dennis Trailer Pump 1\10 one who
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is responsible for the 1 loperation or maintenance of a Dennis No. 2 trailer or portable pumping unit should be without a copy of a new instruction book about this machine that has just been brought out by the maker, Dennis Brothers, Ltd,, Guildford, from whom it can be obtained, price 1s.
Of 120-160 g.p.m. capacity, this outfit is, perhaps, less well known than the 35.9-500 g.p.m. pump of the type commonly associated with Home Office requirements. Model No. 2 is intended for .works, schools, hospitals, etc., where independence from public firefighting services is desired and a relatively small outfit is adequate.
Turning to the contents of the instruction book, there is a full description of the water-cooled V-twin 750 c.c. engine, with information on the general maintenance operations required. A chapter on the Zenith carburetter follows and another on the Wico magneto. Then there is a section on the two-stage pump.
The 40 pages thus accounted for contain pictures and text that is compre. A 22
hensi‘re, yet fully detailed, and little is needed in the way of practical knowledge of the pumping set by him who has read them intelligently and mentally digested the information they lucidly supply.
Finally,, there is a table of pressure losses at various pumping rates for different hose lengths, another rhowing g.p.m. against lb. per sq. in. for a number of nozzle sizes, three trouble. tracing charts and a spare parts list giving prices,