HARP

But, again, broad useage clinically was not usefully 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 th sides of the viewing area.

The mouse-like device let off a squeek (ultrasonic) and the time lag to each microphone was numerically a screen X & Y which was sent in ‘octal’ base form which was easy to feed directly to the computer. In a sense the computer could squeek and know where this mouse looking probe was (had cross hairs in it). No more pencils. 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 squeeking x,y octal data quick to follow feeding the computer. An advertising firm on the Boston perimeter that did Channel 5 commercials (the 5 image tumbled into view) also helped us to efficiently embed coordinates (each body part having its own spatial existence). Then there was the Harvard Math vs the MIT engineering dormitories vying for fresh made apple pies to answer new obscure problems .