Modified method for the determination of relative wave-lengths . KEY TO FIGS. 2 AND 3 iffcrencc Thcun iivered surf „„, , 3hiu ri lir fsSa Tor plate Hs!E3[£l?2^ (Similar 5a. Flat T^^ spring 0 8. Eyclc Lever pivoted.

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectspectra, bookyear1910