Trackball 50 Years Old

GRW writes "Rachel Ross in a Toronto Star story called The mouse that soared, writes "Fifty years ago, a team of engineers in Toronto turned a simple bowling ball into one of the most influential gadgets of our time. The trackball they created would grow into a mouse." "Tom Cranston and a colleague, Fred Longstaff, thought up the trackball idea while working on a Lake Ontario military project called the Digital Automated Tracking and Resolving System (DATAR)."" I played a bowling game in Boston once that used a bowling ball sized trackball to run a ball through a bizarre 3D bowling lane. I thought a regular trackball messed with my wrists ;)

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There's more to the story

[crucini]

At one time my manager was an old mechanical engineer named Roy. Roy had been a fighter pilot, then an engineer at several defense contractors. Roy's account of the creation of the trackball is similar to this story, but he did not mention Canada. I always assumed it took place in the US.

Anyway, Roy told me that an electrical engineer came up with the idea. The problem was to find an input device that would enable an operator to rapidly point at a blip on the radar screen and 'aquire' it as a target. The EE implementation of the idea did not work very well, however, because if the operator shoved the ball in the direction of the target, the cursor would follow an elliptical or parabolic path (can't remember which). Roy invented the mechanical ball suspension that enables the ball to spin in a straight line. This enabled a very fast and ergonomic mode of operation - the operator would push the ball towards the target with a force proportional to the distance, then 'catch' the ball with the outstretched fingers to decelerate it onto the target.

Apparently, the tendency of the trackball to follow a curved path is a variant of a problem well known to mechanical engineers. Therefore Roy's invention was simply the application of a well known mechanical engineering technique. Maybe the people cited in this article are the EE's who originated the idea.