. A class book of (elementary) practical physiology : including histology, chemical and experimental physiology. Physiology. B. WAKE AND BREAK Fig. 21. A Du Bois Reymoncl, B Simple key. Whatever the key, it can be used in one of two ways. 1.—As a Make and Break device it is inserted into the circuit so that when closed the circuit is completed, and when it is opened the circuit is broken. Always use it in this manner when in circuit with a Leclanche cell (Fig. 22). 2.—For short circuiting- (" short- ing"). In this case the circuit is never broken, but the closure of the kej- is so ar
. A class book of (elementary) practical physiology : including histology, chemical and experimental physiology. Physiology. B. WAKE AND BREAK Fig. 21. A Du Bois Reymoncl, B Simple key. Whatever the key, it can be used in one of two ways. 1.—As a Make and Break device it is inserted into the circuit so that when closed the circuit is completed, and when it is opened the circuit is broken. Always use it in this manner when in circuit with a Leclanche cell (Fig. 22). 2.—For short circuiting- (" short- ing"). In this case the circuit is never broken, but the closure of the kej- is so arranged as to offer a path of less resistance to the current. The current is not entirely diverted from the "longer" path, but practically so little passes that it comes to the same thing. Remember that in a divided circuit the distribution of the current is proportioned inversely to the resistance of the respective paths. Les# resistance more current; more resistance less current. Commutator. (Fig. 23.) For the purpose of reversing the direction of a current. Pohl's instrument is the best. The rocker consists of two portions joined across the middle line 1>\ tn. insulating piece R. "SHORTING" Fig. 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 Birch, De Burgh. Philadelphia : P. Blakiston's Son
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysiology, bookyear1
