Regarding materials with negative susceptibilities: Perhaps I have missed something along the way, but there are a number of materials with higher negattive susceptibilities than carbon. The handbook of Chemistry and Physics (59 th edition - 1979) lists the following: Carbon or diamond -6 Bismuth (solid) -280 Aluminum Sulfate (anhydrous) -93 Aluminum Sulfate Hydrate (Al2(So4)3.18H2O -323 Calcium Carbonate -38 Ammonium Nitrate -34 Ammonium Sulfate -67 The values stated are per gram, so the specific gravities are probably important also. It would seem that the crystal form should be the best if available. Have any of these been tried? George Harris _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>