Slide Rules

On 3/7/2013 9:59 AM, Dennis Boone wrote: That was why I had both a 4" and the monster. The jump up in accuracy w both expensive and large to the detriment of being able to have it with me as I schelped from class to class. I didn't want to damage the legend on the large one, and it was already huge in itself. And there was only a lambskin leather cover for it which wouldn't do with everyday carrying. It could have used a hard case, but then would have become like the old "luggable" systems of pre laptop days. You could have carried it, but would not want to. And I don't mean as large as the luggable, just the choice was not real, you would not want one in your sack of stuff in a hard case. Fred, you stretched my head when you said helix vs. spiral. do you get a helix on a flat plane with just lines on it? I thought helix would be cylinder ruled with a line. maybe I'm taking what you meant out of context and you were referring back to the cylindrical devices. I would think the helix would be quite a bit harder to navigate than the spiral. at least on the spiral, you could always see the entire picture, whereas with the helix / cylinder you'd end up with only viewing a stack of legends on a side, part of the helix at any one given time. knowing which vertical one to pick on which cursor could get to be fun. thanks Jim