. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. 188 BIOLOGICAL LECTURES. Engelmann illustrates -this by an ingenious model (Fig. 6). A piece of an E string of a violin about 5 cm. long, previously soaked in water, is fastened to the rigid end of the rod a, of H m c i \^ -:» a^t^ g. Fig. 6. — Diagrammatic Model of tlie Muscle. (After Engelmann.) ab, while the upper end of the string is fixed on the shorter arm of the lever H. To this string different tensions may be imparted by weights d, di. Round the string, but without touching it, runs for
. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. 188 BIOLOGICAL LECTURES. Engelmann illustrates -this by an ingenious model (Fig. 6). A piece of an E string of a violin about 5 cm. long, previously soaked in water, is fastened to the rigid end of the rod a, of H m c i \^ -:» a^t^ g. Fig. 6. — Diagrammatic Model of tlie Muscle. (After Engelmann.) ab, while the upper end of the string is fixed on the shorter arm of the lever H. To this string different tensions may be imparted by weights d, di. Round the string, but without touching it, runs for a length of about 20 mm. and in about 20 curves a spiral of thin plati- num wire. The poles of the wire are connected with two wires coming from the poles of a Grove or Bunsen battery of three or more cells. The whole is immersed in a glass of about 50 cc. contents, and filled with water of about 55°-6o° C. A ther- mometer is placed through the aperture of the ebonite cover. When no change in the position of the lever occurs, close for some seconds the circuit of the battery through the spiral; the lever rises. Upon opening the circuit it falls. The thermometer in the glass indicates scarcely any rise in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ). Boston, Ginn & Co
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectbiology
