This disclosure concerns a solid phase method for detecting antigens or antibodies. An unknown sample is contacted with two sources of solid phase antigen. By treating each source in a particular manner it is possible to determine if the sample contains antigen or antibody.

A television signal detecting circuit is disclosed which has a first electric source, a second electric source (ground potential) different from the first electric source, a series circuit inserted between the first and second electric sources and consisting of a resistor and a condenser, a switching element connected in parallel with the condenser and adapted to become conductive and non-conductive in response to a synchronizing signal of the television signal, and a voltage detecting device co...

Apparatus for detection of the presence of an automobile and its direction of movement into and out of a specific area and activating a reproducing system to provide audible and/or visual information to the driver and then resetting the system upon completion of the reproduction.

A wheeled vehicle is disclosed having a surface sensor mounted for vertical movement on a main frame with the surface sensor detecting surface irregularities in a freshly paved surface with spun glass pad supporting cups being provided on spring biassed support members adjacent wheels of the vehicle for engagement with the periphery of the wheels to coat the wheels with a light coating of oil and to remove asphalt particles from the surface of the wheels to prevent the wheels from creating an un...

A temperature indicator apparatus and method for determining the fluid medium temperature in a fluid stream. An acoustical device is disposed in the flow path of the fluid stream, which device is actuated by the flowing fluid medium to generate sound of a particular frequency as a function of the sonic velocity of the fluid. Sound detecting means are disposed in position to sense the generated sound and to determine the frequency of the sound. The sonic velocity of the fluid is a function of the...

A logic equivalence gate compares signals supplied to and received from an electronic switching circuit to produce an output signal when the switching circuit fails to perform a specified switching operation. A pulse width discriminator rejects noise normally present in the output signal caused by the inherent delay of the switching circuit in normal operation. The noise free output of the pulse width discriminator is applied to a flip flop to provide a stored indication of failure of the switch...

A portable alarm is described wherein an alarm indication is obtained from remotely accessible areas. A flexible alarm event sensor is placed in the area sought to be protected. Incremental movements of the event sensor are detected and cause motion of a hub to enable a trigger element, which normally restrains an actuator, to be pivoted aside. The movement of the trigger element enables the actuator to be released to register indication of an alarm such as activating an acoustic sound source or...

A paper note containing a magnetic strip is transported along a path and adjacent a magnetic detector. This magnetic detector comprises a magnet and a magnetic resistance element provided in the magnetic field generated by the magnet. When the magnetic strip passes through this magnetic field, the change in the field is detected by circuitry. This circuitry detects the change in resistance of the magnetic resistance element. By checking the change in resistance of the resistance element and comp...

A focus detecting photoelectric device includes a plurality of photodiodes each formed by an amorphous silicon layer sandwiched between transparent and non-transparent electrodes. The photodiodes are provided in pairs and are aligned in an array and deposited on a glass plate such that the transparent electrode is directly mounted on the glass plate. The photodiodes in a pair are located closely adjacent to, but in a spaced relation with, each other and are electrically connected in series to ea...

A tubular section is provided through which fluid can flow. A paddle is mounted in the tubular section and is biased by a spring to a "no-flow" position, at least partially across the tubular section. Fluid flowing through the tubular section rotates the paddle to a "flow" position which is aligned and not across the tubular section. The device has been improved by having a signaling means in the form of a magnet mounted on the paddle in the tubular section for signaling when the paddle is in on...