| http://www.w3.org/ns/prov#value | - Insulators such as glass and crystals aretransparent whenever they are sufficiently homogeneous, and the veryremarkable researches of Prof. Graham Bell in the last few months haveshown that even _ebonite_, one of the most opaque insulators to ordinaryvision, is certainly transparent to some kinds of radiation, andtransparent to no small degree.[The reason why transparent bodies must insulate, and
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