Slugs? Yuck. The figures look good; check at this page: http://www.egr.msu.edu/ERL/case/sections/ch_07_26_02a,b,c.htm (A.6. Pressure Units is down about 1/3 of the page) I'd be greatly interested in U.S. sources of wire more appropriate to 19th century instruments; so far, I only know of Malcolm Rose's wire. Clark
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