HARP

but... again, broad use clinically was not feasible with calculations from tediously etch-a-sketched-like 2 knobs twisting taking weeks to get a data set. It WAS a start. RERC, in Boston,

(MIT/Harvard) rebuilt the Vanguard setting the hand cranked knobs aside, and applying two sound sensors (like long skinny microphones) along the sides of the viewing area.

A mouse-like hand held device let off an ultrasonic squeak and the time lag to each microphone was numerically a screen X & Y which was sent in ‘octal’ form which was easy to feed directly to the computer. In a sense the computer could squeak and know where this mouse looking probe was. It had cross hairs in it. No more pencils. Direct computer data in computational form. Film still needed processing but that could be done quite fast as x ray processors could already easily do it... a sightly modified dedicated film processor had squeaking x, y octal data quick to follow & feeding the computer. An advertising firm that had Channel 5’s 5 image tumble into view helped us to efficiently embed coordinates (each body part having its own spatial existence). The Harvard Math vs the MIT engineering dormitories competed for fresh made apple pies as reward for answers to new obscure computational problems.