LANTERN SLIDE ILLUSTRATING SOUND WAVES. BY OHO. M. HOPKINS. In demonstrating the theory of sound it is usual t illustrate the condensations and rarefactions of air The Decline in Price of Electrical Equipments. The Nickel Armor Plates. Photo Etching on Copper. Fig. SA RRANGEMENT FOR PROJECTING TWO IMAGES OF THE SLIDE. Fig. 4RE-ENFORCEMENT Fig. 5BEATS., scientific american, 1894-06-23
LANTERN SLIDE ILLUSTRATING SOUND WAVES. BY OHO. M. HOPKINS. In demonstrating the theory of sound it is usual t illustrate the condensations and rarefactions of air The Decline in Price of Electrical Equipments. The Nickel Armor Plates. Photo Etching on Copper. Fig. SA RRANGEMENT FOR PROJECTING TWO IMAGES OF THE SLIDE. Fig. 4RE-ENFORCEMENT Fig. 5BEATS., scientific american, 1894-06-23
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