Recorder for decompression data

A recorder to record time versus pressure for an underwater diver, comprising:

• (a) a clock having a periodic electronic output signal;
• (b) a pressure transducer carried by the diver and having an electronic output signal and connected to the clock to give a periodic pressure signal;
• (c) and an electronic recording device connected to the pressure transducer to store the periodic pressure signals;
• to thereby form a continuous time-pressure record of the time at which a diver is exposed to various pressures.

A recorder readout for a digital electronic recorder of decompression data wherein instantaneous pressure data has been recorded at specified time intervals comprising:

• (a) an x-y display device having one terminal for analogue signals for each of said x-y and y coordinates;
• (b) a clock connected to one of said display terminals creating time signals at intervals at a multiple of said time intervals of said digital electronic recorder;
• (c) an addresser connected to said digital electronic recorder to direct inquiry signals to said digital electronic recorder in the same pattern as the recorded data was received;
• (d) a connection from the addresser to the clock output to send inquiry signals to said recorder at a multiple of the time intervals at which data was recorded;
• (e) and a digital-to-analogue converter connected to said recorder to receive the output of the inquiry signals and connected also to the other coordinate terminal of the x-y display device,
• whereby an x-y display is made of the recorded data versus time.

Diver-monitoring apparatus for obtaining decompression data, comprising:

• (a) a shipboard recorder for time and pressure signals;
• (b) a clock connected to the recorder to give a time coordinate;
• (c) and a pressure transducer carried by the diver and having an output connected to the recorder,
• whereby instantaneous pressures are recorded chronologically to establish a time-pressure curve to show the time duration of various pressures to which the diver is exposed.

Apparatus for the remote display of data of conditions under which a diver has operated that have been recorded on a digital electronic recorder at specified time intervals, comprising:

• (a) a display device having x and y coordinates and having a terminal for analogue signals for each of said x and y coordinates;
• (b) a clock having periodic electronic output signals and connected to one of said display terminals;
• (c) an addresser connected to said digital electronic recorder to direct inquiry signals to said digital electronic recorder in the same pattern as the recorded data was received;
• (d) a connection from the clock output to the addresser to send periodic inquiry signals to said recorder;
• (e) and a digital-to-analogue converter connected to said recorder to receive the response of the inquiry signals and connected also to the other coordinate terminal of the x-y display device,
• whereby an x-y display is made of the data versus time.