AM. JOUR. SCI., Vol. XIX, 1880. Plate XVII 
10 2 “ a 4 
it an eat Wit 1 int tite tn wii yO ii tf RE Pil a | win ri Ty Lj ree i iv mh if | f by A t nvT tir Wrvenndits if 5 use ATES) ant t us PUTED vi L ‘nia nie Ma | i | | l 
0 Mn) ini MT mY 
GiAR SRAUS he ee ie LR RIelS? See (01 2 Se ee ae 5 Ee 
TI I t au th uh I 
ee 
Photographic Spectrum of a Lyre, 
