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Two pieces of pumice stone

Two pieces of pumice stone

1790-1819
Two pieces of pumice stone

Two pieces of pumice stone

1790-1819
Thomson's Portable Electrometer, 1867-1888

Thomson's Portable Electrometer, 1867-1888

1867-1888
8 Pieces of pumice stone

Eight pieces of pumice stone

1790-1819
Stick of charcoal, block of pumice, and 3 other stone blocks, possibly used like terra sigillata

Three stone blocks