A signal balloon is provided for use by hunters, boatsmen and the like to attract searchers when the hunter or boatsman is lost or in distress. A brightly colored translucent balloon containing radar reflective material is attached to a cannister containing a battery and bulb for illuminating the balloon from inside and is formed with a charging chamber to receive a cylinder of helium and operating through a valve by which the balloon may be inflated. A line is attached to the casing for holding...

A programmable cyclic recorder selectively records signals on a plurality of analog and digital record tracks. A signal analyzer responds to an event occurring in a system being analyzed (which supplies the signals to be recorded) for stopping further recording and holding all recorded signals in the cyclic recorder. The recorded signals are then selectively read back track by track and analyzed for determining system performance. Synchronizing pulses are recorded contemporaneously with all of t...

A geophone senses seismic vibrations in the earth and converts them to electrical seismic signals which are amplified and filtered in an active bandpass filter-amplifier having automatic gain control and a 10-40 Hz. passband. The amplified and filtered signal is rectified in a first full-wave rectifier, is subsequently filtered in a circuit having a 1-4 Hz passband. characteristic, and is again rectified in a second full-wave rectifier. The latter rectified signal is summed by an integrator over...

Seismic vibrations sensed by a geophone in a protected area are converted to an electrical seismic signal that is applied to an envelope detector. The detected signal is coupled directly and through an integrator which inverts the polarity thereof to a summing network. The zero crossings of the seismic signal are detected to generate a train of pulses that are integrated to produce a signal having an amplitude that is related to the fundamental frequency of the seismic signal and of the opposite...

A signal device for indicating the bite of a fish on a fishing line is attached to a support for a fishing rod and comprises a housing of current-conducting material for a battery and a battery-operated lamp. A lever of current-conducting material is pivotally mounted on the housing and the fishing line engages the end of the lever. An electrical contact is positioned on the housing near the lever. A pull on the line will pivot the lever into engagement with the contact to complete the circuit t...

In the signal processor disclosed herein, the respective sets of echo signals reflected back from an environment in response to a radiated signal comprising a pair of adjacent frequency components are modified according to a preselected time-amplitude function and are cross-combined so as to generate an output signal whose amplitude varies as a function of the net displacement of a target within the environment. Further, the output signal is relatively insensitive to moving clutter which does no...

The absorbance measuring signal processor disclosed herein operates to generate a signal representing the absorbance of an unknown sample in relation to the absorbance of a previously measured standard sample. In measuring the absorbance of each sample, standard or unknown, the apparatus generates a signal corresponding to the log ratio of two signals, representing, respectively, the optical transmission of the sample channel and the optical transmission of a reference channel. The use of the ra...

A distress signal including electrically operated audible and visual signals for aid, which is adapted to be mounted on the roof or other prominent portion of a dwelling and be operated in an emergency by occupant-manipulated switches appropriately placed within the dwelling.

A balloon package is folded onto an ejection platform which becomes propelled outwardly from an enclosure. A gas cartridge inflates the balloon as the latter is ejected from the enclosure causing the balloon's inflation. A radio transmitter attached to the balloon is actuated when the balloon is ejected so that a coded radio signal can issue forth from the location of the balloon. Manual and automatic trigger means are provided for ejecting the balloon.

An accumulator of a multiplicity of sources of add and subtract signals in which the signals can be of any duration and can occur in any sequence, including simultaneous occurance. The accumulator comprises a rotary power source, intermediate storage elements for storing the signals as received from the sources, control elements for transferring the information in the intermediate storage elements to a final storage, such as a display unit or a sensing unit, resetting elements for resetting the ...