. The principles of physics. Fig. 365. DANIELL CELL. 473 366). This form of cell is commonly used on closed chief merits of these cells arethe complete absence of polari-zation of the negative plate (con-sequently, the constancy in thepotential difference of the twoelements) and the uniformity ofcurrent which is yielded. The kinds of cells that havebeen devised are numberless. Thevoltaic battery will probably longcontinue to be of scientific inter-est, but for commercial uses ithas already become well-nigh ob-solete, being replaced by othercheaper and more efficient ap-pliances fo
. The principles of physics. Fig. 365. DANIELL CELL. 473 366). This form of cell is commonly used on closed chief merits of these cells arethe complete absence of polari-zation of the negative plate (con-sequently, the constancy in thepotential difference of the twoelements) and the uniformity ofcurrent which is yielded. The kinds of cells that havebeen devised are numberless. Thevoltaic battery will probably longcontinue to be of scientific inter-est, but for commercial uses ithas already become well-nigh ob-solete, being replaced by othercheaper and more efficient ap-pliances for generating electriccurrents, to be hereafter battery mu§t, therefore, com- Fig. 366. mand in the future relatively less attention in our text-booksthan Questions. 1. a. What is an amalgamated zinc plate ? 6. A voltaic cell or pair ?c. An electrode ? 2. a. How may it be shown that a plate of copper and a plate of zincTieoome electrified when placed in dilute sulphuric acid ? 6. Which willbe positively electrified ? c. If wires leading from these plates be joined,what change will occur ? d. What purpose does the connecting wireserve ? e. Why ought not the plates of a voltaic cell to touch each other ?/. Why ought not the wires of certain voltaic cells to touch each otherwhen not in use ? 3. a. What do you understand by an electric current ? 6. What isthe function of a battery ? c. With what propriety is the zinc plate of avoltaic cell called the positive plate and the negative electrode of a voltaicsystem ? 4. How does electricity pass from plate to plate within a voltaic cell ? 5. a. What is meant by local currents ? 6. How may they be pre-vented ? 474 ETHER DYNAMICS. 6. a. Give an example of a counter electromotive force, b. By whato
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1895
