Measures for avoidance and extermination of flies, mosquitoes, lice and other vermin / by H. Maxwell-Lefroy.

  • Harold Maxwell-Lefroy
Date:
1916
Catalogue details

Licence: Public Domain Mark

Credit: Measures for avoidance and extermination of flies, mosquitoes, lice and other vermin / by H. Maxwell-Lefroy. Source: Wellcome Collection.

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    through a window can be caught in traps of the pattern shown below, see Fig. 2. Description of Figure 2. Hodge op Window Fly-trap.— This trap, which is intended to be fitted to the lower half of a window, consists of a rectangular box with ends of wood ; the sides, parallel to the aperture of the window, being made of wire gauze. This gauze, on either side, is bent to form a longitudinal pleat or fold in two places along the lines A B and C D (see Fig. 2d). At the apex these folds are pierced with holes half an inch in diameter, through which flies can pass into the trap (see figure 2b, which re¬ presents a cross-section of the trap). A shallow trough K, containing bait, is placed on the floor of the trap with a sliding adjustment. A slit, quarter of an inch in width, at the base, admits flies to the bait ; the latter is covered by a piece of wire gauze, bent at an angle, at whose apex holes half an inch in diameter admit the flies into the trap. Flies entering at the bottom slit or by the side pleats, pass up in the direction of the arrows in Fig. 2b, and are collected in the top chamber P through the slit M. The chamber P is also made of wire gauze and can be detached at intervals in order to kill the imprisoned flies. Description of Figure 3. Minnesota Fly-trap.—This trap, which is of much simpler construction than the Hodge Trap, can be made of wire gauze attached to a wooden frame¬ work. It consists of a rectangular box with sides and top of gauze, the bottom A is of wood and is interrupted along the centre by a wide longitudinal slit (B). This slit is roofed in with gauze bent at an acute angle, at whose apex is a narrow slit half an inch in width (or a series of small holes half an inch in diameter) to allow the flies to pass through into the trap; this is shown in Fig. 36, which re¬ presents the trap in section. Underneath the gauze is placed the pan K containing bait. At the four corners the trap rests upon a wooden base D D leaving at the sides an open slit, a quarter of an inch in width, to admit the flies to the bait. If desirable, an upper removable fly chamber can be fitted as in the Hodge trap.
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