Abstract: The liquid transfer device includes a one-piece molded barrel plate having a plurality of syringe-type barrels extending downwardly therefrom and support flange extending downwardly about the perimeter of the barrel plate. An elastic membrane rests on and is substantially coextensive with the upper surface of the barrel plate. A retaining plate having a plurality of apertures in alignment with the respective barrels is detachably mounted on the barrel plate in either a first position wherein annular projections about each aperture lightly engage the membrane to hold it in place or a second position wherein the projections extend into each barrel to seal the membrane about the upper edge of each barrel. A plunger having a plurality of pins is placed on the retaining plate with the pins extending through the apertures to engage the membrane. Depressing and releasing the plunger will draw a predetermined amount of liquid into each barrel.

Abstract: The liquid transfer device includes a hand-held housing having a plunger mounted for sliding movement therein with a plurality of rods on one end thereof. The plunger is located within a recess in the housing with the rods normally protruding outside the recess when the plunger is located fully within the recess. A barrel assembly is detachably connected to the housing and is provided with a plurality of through passages that are in equal number to the number of rods. An elastic diaphragm or membrane is secured between the housing and the barrel assembly over the rods so that the membrane is stretched into the individual through passages by means of the rod so that the ends of the through passages adjacent the housing are sealed by the membrane.

Abstract: A substantially rectangular inoculum tray is provided with a reservoir in the upper surface thereof having at least one apertured side wall with the bottom surface of each aperture being at least at the level of the bottom surface of the reservoir. A plurality of parallel identical grooves are formed in the upper surface of the tray with one end of each groove being in communication with a respective aperture. The bottom surface of each groove is disposed below the bottom surface of the reservoir so that upon introducing a liquid medium into said reservoir a pressure head will be formed so that a uniform distribution of the liquid will occur from the reservoir into each individual groove.

Abstract: The rehydrator is comprised of a first plate having a plurality of hollow tubes secured in through apertures and extending from one side of the plate perpendicular thereto. A plurality of rods are secured to a second plate disposed parallel to the first plate and extend through respective tubes in the first plate. The second plate is guided for movement toward and away from the first plate on a plurality of guide rods and springs are provided to normally bias the second plate away from the first plate. The rods slide loosely within the tubes and upon movement of the second plate downwardly into engagement with the first plate, the ends of the rods will extend beyond the tubes so that upon immersion of the ends of the rods and tubes into a solution, the withdrawal of the rods into the tubes will cause a predetermined amount of fluid to be drawn into the tube.

Abstract: A drill comprising a shank and an elongate body with an axial slot near one end thereof. A generally hexagonal insert of sintered tungsten carbide or high speed steel is placed in the slot and received in a V-shaped seat formed in the bottom of the slot. A cross-screw extends through a hole in the insert and serves to clamp the slot closed upon opposite sides of the insert. In a preferred embodiment a passage extends axially through the drill body, and the insert seats in a separable anvil which is located by means of a tang registering in the axial passage.