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Steel engraving depicitng a Spectroscopic Apparatus
ARP18A29_276

Steel engraving depicitng a Spectroscopic Apparatu...

Solar Eclipse Observatory, Nicobar Islands
ARP15A00_421

Solar Eclipse Observatory, Nicobar Islands

Spectroscopic apparatus used by used by Robert Wilhelm Bunsen
ARP07103_460000533

Spectroscopic apparatus used by used by Robert Wi...

Janssen and Lockyer, 1868. Pierre Jules Cesar Janssen (1824-1907), French astronomerand Joseph
ARP07105_460001697

Janssen and Lockyer, 1868. Pierre Jules Cesar Jans...