A rat guard for ships’ hawsers and the like. A polygonal barrier plate has a bottom portion and has a top portion with two steeply converging edges meeting at a narrow vertex at the very top. A slot in the bottom portion extends up to a round hawser-engaging edge at about the center of gravity. A self-closing door is pivoted to the plate near the upper end of said slot. It is urged to a normally closed position by its weight and its relation to its pivot, and it then lies athwart the slot, with …

A pair of bait receptacles are provided on either side of a passageway designed to entice the rat to be trapped past a first one-way gate. The passageway leads the rat upwardly through a passageway and a second gate or flipper in middle of climb. At the top, he slides downwardly to a holding tank provided at the rear of the rat trap and readily removable therefrom for disposing of rats trapped therein.

A container has one or more openings which extend into the container down elongated passageways. The passageways have needle prodders mounted along sidewalls to discourage rodent retreat once a rodent has entered the passageway. The interior ends of the passageways have doors with small holes for permitting rodents to smell enticing substances on the interior of the container, which doors are structured with lengths greater than the height of the passageways such that the doors extend into the i…

A trap for rats and the like rodents formed of a sheet metal, covered box having an opening in one wall and a steep ramp located within the box and extending from the bottom of the opening to a point just below the cover of the box. A vertically arranged sheet metal channel surrounds the ramp to form a ramp containing chamber located within the box, which isolates the ramp from the remainder of the box interior. Bait is suspended within the box near the upper end of the ramp to entice the rodent…

A rat guard for ships’ hawsers. A barrier plate has a main open-end slot leading upwardly from its lower edge toward an arcuate hawser-engaging end near its center of gravity, and a through opening near its upper end. A pivot pin is near the upper end of the main slot. A freely swingable closure door has an upper end portion with a recess extending in from one side edge and an arcuate portion for engaging the hawser. This door has a closed slot receiving the pivot pin, so that the door is slidab…

A person having a back-mounted portable sprayer sprays a trail of rat-enticing substance along alleyways and up ramps. Ramps are connected to upper portions of large containers which are configured for mounting on haulage-type road vehicles. Trailers, tilt-bed type containers and truck-mounted containers are used. After a container has a load of rats, access doors are closed, ramps are folded on top of the containers, vents are closed, and an inlet is connected to a vehicle exhaust. Rats are kil…

A rat trap for luring and capturing live rats and the like, comprising an outer housing normally fixedly embedded in the ground and having at least one opening through the side thereof near the surface of the ground, a removable container fitted within the outer housing and having at least one opening through the side thereof in registry with the opening in the outer housing, whereby rats and the like are enabled to enter the container through said openings, closures on said container and outer …

A rat guard for ships hawsers and the like. A polygonal barrier plate has a generally flat bottom portion and a top portion with two steeply converging edges meeting at a narrow vertex at the very top. The bottom portion is connected to these steeply converging edges by two upwardly diverging sides, one of which has a slot that extends up at an angle and then horizontally into the center to a round hawser-engaging edge at about the center of gravity. The center of gravity is so positioned that i…

A rat ring device to attach to hawsers of moored boats or ships for preventing the boarding of rodents. The device has a spindle with a throughbore to frictionally fit the specific hawser and knobbed ends which retain a rotatable cylinder on the spindle and prevent axial movement of the cylinder on the spindle. The rat is readily spun off when attempting to traverse the device to reach the boat or ship. One of the knobbed ends has a loop for attaching a tag line which is attached to the boat or …

Antibody against human chorionic gonadotropin is raised in rats, preferably Lewis Strain Inbred rats, using either whole hormone or the .beta.-subunit as the antigen, and displays low cross-reactivity with luteinizing hormone as well as high sensitivity.