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accurate actinism actual admit Allegheny AMERICAN amount of energy analogy apparatus application area arms axis balance battery believe BERKELEY BOLOMETER books Bridge cause change of temperature chemical circuit CIRCULATION convey Copper current curves cylinder December deflected degree delicate difficult diffraction spectrum distribution of energy effect electric employed enable enlarge enormous equal evidence experi experimental feeble final finger force form galvanometer illustrate indicated instrument knowledge latter construction less light loans means meas measured ment merely metals meter METROLOGICAL SOCIETY minute modulate needle obtained oc and ft ohms palladium parallel perhaps pile Pittsburgh platinum portion possess a resistance power practical importance present pressure principle Prof promise proportionality radiant energy radiant heat real received recharged remains Renewals result roughly S. P. LANGLEY science sense sensitive sheet side similar number small solar energy special steel strips surface theoretical thermopile thermoscope thick thin tool twenty unverifi urer valve warmed webers wholly wire