Abstract: An oscillatory mechanism, designed particularly for use in a laboratory shaker, includes a member, or a system of members, arranged to perform oscillatory movements, the transmission of power to that member or system, whereby its oscillation is caused or maintained, being by means of fluid pressure, the mechanism comprising means defining one or more chambers each having an inlet connectible to a source of pressurized fluid and an outlet through which, when open, pressurized fluid supplied to each chamber can escape; the respective chamber being expansible under the action of said pressurized fluid when each said outlet is closed; and wherein the motion of the oscillatory member or system in operation cyclically opens and closes each said chamber outlet, the consequent expansion of the respective chamber upon closure of the outlet delivering an impulse to said member or system whereby the oscillation thereof is caused or maintained.

Abstract: A method for inhibiting the atmospheric corrosion of metals in a sealed space with inhibiting amounts of vapor phase inhibitors consisting of disposing in said sealed space a carrier means for storing a stock of inhibitors and diffusing their vapors wherein said carrier means is silica gel or zeolite and contains a liquid inhibitor selected from the group consisting of primary, secondary and tertiary amines and mixtures thereof.

Abstract: A thin layer of gel on a metallized solid surface has two or more wells formed through the gel which are subsequently filled with specimens of first and second solutions suspected of respectively containing first and second immunologically reactive biological particles specific to each other. The specmens are allowed to diffuse in the gel, and presence of the first and second biological particles in the solutions forms a complexed protein precipitate line on the metallized solid surface corresponding to the region of intersection of the two diffused specimens and which is visible with good contrast to the unaided eye without the need for staining the gel and provides a durable record of the immunological reaction which forms the precipitate.