Fifth report of the United States Entomological Commission, being a revised and enlarged edition of Bulletin no7, on insects injurious to forest and shade trees . e Cylinder brass Pump.—The special recommendation of thispump is the more freely given fromthe fact that at present no one holdsa patent on it and various modifi-cations embracing the essential fea-tures are largely manufactured indifferent parts of the country. At-tention was directed to the advan-tages of this pump in the work ofthe commission, and it is illustratedin section and also in operationat plate XLVI of the fourth re-port
Fifth report of the United States Entomological Commission, being a revised and enlarged edition of Bulletin no7, on insects injurious to forest and shade trees . e Cylinder brass Pump.—The special recommendation of thispump is the more freely given fromthe fact that at present no one holdsa patent on it and various modifi-cations embracing the essential fea-tures are largely manufactured indifferent parts of the country. At-tention was directed to the advan-tages of this pump in the work ofthe commission, and it is illustratedin section and also in operationat plate XLVI of the fourth re-port. The pump, fitted in a barrelwith stirrer attachment, there illus- J^ trated, was specially constructed by II Dr. Barnard, and has been several — ll times mentioned and illustrated in Fig. 7.—Double cylinder brass pump. other official reportS. The appended illustration (Fig. 7) is a sectional view of a similar pumpnow in use by the Division. The essential features of this pump are an outer cylinder a and aninner cylinder a, which may be called the piston cylinder. This innercylinder is provided with a valve, b, similar to the valve int he outer cyl-. REMEDIES AGAINST FOREST INSECTS. 41 inder 6^ and above the valve b the iauer cylinder is closed as shown inthe cut. Thus it represents a displacement cylinder and its capacitybears such a relation to the outer cylinder that on the downward strokeit displaces a body of water equal to that taken up by the upwardstroke of the piston, thus producing a constant pressure in. a simplesingle-barreled pump. The packing d is held in place by a metal follower and fits snugly tothe inner surface of the outer cylinder. The pipe, c, is of rubber hose andmade of any length desired to suit the depth of cask or tank and witha fine wire strainer on the bottom. The head of the pump is of cast ironand bulged to allow room for a considerable head of water; iron flangesextend out from its lower part and furnish support by which if is boltedto the
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