Thanks for the reply, Phil Gesotti. I am back on Sinemet again, I managed to stay off for two weeks, but then my tremor returned. It might be that I am again unemployed, and again looking for work, and as such might be just the stress, anyway, the two 200-50 Sinemet Cr pills a day magically take away my tremor symptom. Now, if only I could arrange to be part of a placebo test? Does anyone out there know how to arrange for a placebo test? As for 3 places of accuracy, yes, in Seismic Surveying, the required accuracy was only 1 in 300, that is, you could be out 1 foot in 300 feet, so we measured distances using the odometer on the truck. But, in engineering surveying, the required accuracy was 1 in 50,000, so the slide rule was worthless in engineering work, although every engineer used one, but just to roughly check his work. [log in to unmask]