000 data words are obtained fortunately the spacing of the data samples from the four acoustic channels afford sufficient data points to enable reconstruction of the analog signals at the time of data conversion in any event the buffer 48 stores 1 000 words assume further that the acoustic pulses will occur 500 milliseconds apart if the logging tool is being raised in the borehole at a rate of 120 feet per minute or 2 feet per second then spacing of 500 milliseconds enables data to be safely obtained approximately every foot recall that the data in the buffer was obtained over 1 000 microseconds or one millisecond this data can then be transferred over a time interval less than about 490 milliseconds a markedly slower rate of transfer this slow rate enables the telemetry transmitter to obtain and transmit the data 1 000 data words from the buffer to the surface this data transfer occurs at such a slow rate that the pass band of the monocable imposes no particular limitation on the operation of the system in fact this slow rate of transfer of data is advantageous because it then enables the use of a monocable the monocable is able to transmit this data through the telemetry transmitter in the sonde to the receiver at the surface without data degradation the clarity and quality of data transfer is thus enhanced by the slow speed of transfer while high speed transfer potentially could be had the slow transfer is desirable to enable the use of the monocable scale factors have been used above needless to say they can be varied for instance the time duration of data capture can be.