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 . or failure of the work. The desiderata in a spray nozzle,as I have elsewhere stated, are ready regulation of the volume to bethrown ; greatest atomizing power with least tendency to clog ; facilityof cleansing, or ready separation of its component ])arts; cheapness;simplicity and adjustability to any angle. Without attempting a general discussion of the merits of differentclasses of nozzles, I shall content myself with a brief refere
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 . or failure of the work. The desiderata in a spray nozzle,as I have elsewhere stated, are ready regulation of the volume to bethrown ; greatest atomizing power with least tendency to clog ; facilityof cleansing, or ready separation of its component ])arts; cheapness;simplicity and adjustability to any angle. Without attempting a general discussion of the merits of differentclasses of nozzles, I shall content myself with a brief reference to a fewstyles, which, to a greater or less degree, answer the conditions justenumerated and which have stood the test of practical work. The Riley or cyclone Nozzle.—This nozzle is now so widely known ashardly to require description. As there have been some erroneous state-ments as to its invention, I may take occasion here to reiterate what wasrecorded in the fourth report of the commission, viz: that it was adev^el-opuieut and outgrowth of my work on the Cotton Worm, the first sug-gestion of the principle being my own and its development resulting. Fio. 11.—The lliley or cyclone Nozzle. from two years experimentation under my direction and chiefly throughthe assistance of the late Dr. W. S. Barnard. Its principal feature con-sists in the inlet through which the liquid is forced being bored tangen-tially through its wall, so as to cause a rapid whirling or centrifugal REMEDIES AGAINST FOREST INSECTS. 45 motion of the liquid, which issues iu a funnel-shaped spray through acentral outlet in the adjustable cap. The breadth or height, fineness orcoarseness of the spray depend on certain details in the proportion ofthe parts, particularly of the central outlet. Fig. 11 shows two styles of this nozzle, which I bave adopted from ahost of experimental forms as the best for all ordinary work. At A isshown the typical small-stemmed nozzle, with the screw cap removedto show the
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