Improvements in the method of and apparatus for the continuos diffusion of insecticidal, fungicidal and germicidal vapours / [John Duncan Campbell].

  • Campbell, John Duncan.
Date:
1903
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in the method of and apparatus for the continuos diffusion of insecticidal, fungicidal and germicidal vapours / [John Duncan Campbell]. Source: Wellcome Collection.

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    5 10 Continuous Diffusion of Insecticidal Fungicidal and Germicidal Vapours ^ arTconstructed. By this means the liquid is prevented from assuming the spheroidal state, and owing to eapilliary action, it instantly spiea s over a re a tivelv large heating surface of the wires and gauze, so producing the desired rapid evaporation. It is to he understood that the roughening oi corruga mg of the surface may be omitted when the wires are used and that the wires and gauze may he substituted by other equivalent metallic, or non-absorbent neutral devices. The closed evaporating vessel is provided with an inlet for the fluid mixture or solution, and a pipe outlet so constructed that the issuing vapours can be locally applied as desired, by its means. The vessel with its lamp or heating device can be provided with wheels or otherwise for transport. The mixed fluid or solution is contained in a separate vessel, from which it may flow by gravity or from which it may be forced by pneumatic piessure set up from time to time by a small air-pump connected with the vessel. This also is provided with means for its transport as described with reference to the evaporating vessel. The liquid is conveyed from the storage vessel to the evaporating vessel through a suitable pipe in which there is a cock or valve by means of which the flow is controlled so as to produce the required result in the evaporator, that is to sa}^ the practically instant evaporation of all the entering liquid. Dated this 17th. day of February 1902 A.D. W. E. HEYS & SON, Agents for the Applicants. *20 COMPLETE SPECIFICATION. Improvements in the Method of and Apparatus for the Continuous 25 Diffusion of Insecticidal Fungicidal and Germicidal Vapours, We, John Duncan Campbell and William Herbert Yates, both of the Irwell and Medlock Works, 185, Water Street, Manchester, Chemical Manu¬ facturers, do hereby declare the nature of this invention, and in what manner the same is to be performed, to be particularly described and ascertained in 30 and bv the following statement. %j • o This invention relates to the method of and to apparatus for the continuous diffusion and application of insecticidal, fungicidal and germicidal mixed vapours, and has been devised with the object of overcoming difficulties and inconveniences which have been encountered in attempting to economically and effectively diffuse and apply the vapours of vapourisable fluid mixtures or solu¬ tions. 1 bus, it has been found that if such a fluid mixture or solution be gradually heated in the ordinary manner, fractionation takes place and it results that the produced vapours vary in composition as the vaporisation proceeds, and that they may soon become either too strong or too weak for the purpose required. For instance, if an aqueous solution of nicotine be boiled in the usual manner, the proportion of nicotine in the mixed vapours will, vary to so large an extent that very soon the proportion of nicotine would be so small as to be useless as an insecticide, and there would be no ecomomical distribution of the nicotine. ^ An attempt to obtain the continuous and uniform evolution of vapours of mixed fluids for disenfecting purposes has been suggested, which consists in dropping the liquid into a heated porous substance contained in an open vessel Although fractionation takes place, yet, the whole of the vapours beiim dissemi¬ nated in a closed room, it is possible to thus obtain a fair aggregate result. But CO