Abstract: The invention is an improved electrophoresis device for the recovery of nucleic acids and other substances. The apparatus and method of this invention is for the purpose of recovering large charged molecules in a pure state after they have been separated from a mixture by gel electrophoresis; the charged molecules from gels which has high quantitative recovery without contamination by an apparatus and method which is rapid and convenient to use. The apparatus consists of a plurality of transfer chambers suitably supported in a vessel for containing an aqueous buffer solution, a plurality of filter discs for support of a layer of DEAE cellulose resin in the bottom of the transfer chambers, a plurality of negative electrodes (one in each of the upper portion of each of the transfer chambers), a positive electrode for placement in the buffer which will surround the plurality of transfer chambers, and a power supply.

Abstract: Apparatus for securing an emergency exit door includes a bolt for engaging a keeper, a dogging mechanism for dogging the bolt and a fluid throttling device disposed between the bolt and dogging mechanism. An electrical timer is connected to the dogging mechanism by a solenoid and starts to count upon an attempt to open the door. After a predetermined time interval has run, the electrical timer releases the dogging mechanism and allows the door to open. If the electrical timer fails to release the dogging mechanism, the door will still open if pushed due to operation of the fluid throttling device, which slowly shortens under pressure, allowing the bolt to clear the keeper.In order to readily align the keeper with the bolt, the keeper is loosely mounted and guided into alignment with the bolt by a bevelled guide. Upon being latched by the bolt, the keeper is held rigidly between the guide and the bolt.

Abstract: A system for identifying emergency exits in a building includes a strobe light which is tethered at an elevated location with respect to the floor of the building. The strobe light is normally held at the elevated position by an electromagnet, which electromagnet is kept energized as long as a smoke detector connected thereto does not sense a dangerous level of smoke. As soon as the smoke detector detects smoke above a certain threshold level, the electromagnet is deenergized and the strobe light drops to a position suspended just above the floor. The strobe light includes its own battery source which is connected to the strobe light by a switch which closes when the strobe light is dropped. An electric motor is provided to rewind the tether when the smoke detector no longer indicates an emergency situation. By tethering the strobe light, the light can be dropped beneath the smoke level in the building, allowing people crawling along the floor to determine the location of emergency exits.

Abstract: An emergency exit sign utilizes an EL lamp in combination with a pilot light which is connected to the EL lamp via a photoelectric link. The photoelectric link monitors the brightness of the EL lamp and keeps the pilot light on so long as the EL lamp is lit. The pilot light is necessary because the illumination provided by the EL lamp may be less than the illumination of background brightness making it difficult to tell by looking at the EL lamp whether or not the EL lamp is energized. Since the pilot light provides a "point" of illumination, it is easy to see when it is on so that one can tell whether or not the sign is lighted by simply looking at the pilot light.In order to see the exit sign even if power to the EL lamp is interrupted and the room is dark, a translucent sheet of phosphorescent material is placed over the EL lamp to transmit light from the EL lamp while at the same time storing energy so as to "glow in the dark" should the EL lamp be extinguished.

Abstract: The disclosure relates to a radial scanner usable for scanning a small volume of a test sample in a differential light scattering analyzer. In the scanner a beam of collimated light impinges on a rotating planar mirror located above or below the test sample on an axis passing through the small volume. A beam of light reflected from the mirror sweeps a conical mirror, having its reflecting surface curved about a reference axis passing through the small volume. The small volume is scanned by a beam of light reflected from the conical mirror at different radial angles as the planar mirror is rotated.