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ELECTRICAL DEVICES OF THE MUTUAL ELECTRIC 

 COMPANY'S SYSTEM. 



In last week's issue we presented illustrations of the Knowles 

 dynamo and storage-battery as used by the Mutual Electric Com- 

 pany of Brooklyn. Several other electrical devices used by the 

 same company are shown in the accompanying illustrations. 



The Knowles meter is shown in Fig. I. It is inserted in the 

 main discharge circuit, and is arranged to record in lamp-hours, 

 or, when preferred, directly in dollars and cents ; so that a sin:iple 

 inspection will show the exact amount of current used, or its co^t 



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tential to suit the requirements is secured by means of the switch 

 at the head of the board, which throws in resistance sufficient to 

 make the potential, as measured by a voltmeter in the charging 

 circuit, the same as that previously found to e.xist between the 

 terminals of the battery. 



The Knowles current-indicator, as supplied with each dynamo, 

 is shown at Fig. 3. It is arranged either with or without bell 

 attachment for calling attention to excessive variation of the cur- 

 rent. A safety cut-out, for use .at the entrance of the circuit to 

 buildings, or for loop circuits, is shown at Fig. 4. The Knowles 



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FIG. I AND 2. 



SAfiru 

 METER AND BATTERY-CHARGING BOARD. 



to the consumer. The meter is simple in construction, conjbining 

 a varying electric device with a constant time device, and is not 

 liable to get out of order under ordinar\' usage. It has a large 

 range, and records equally well with low or high current strength. 

 A battery-charging board is shown in Fig. 2. Upon the board, 

 as will be seen, are three switches, each between a pair of binding- 

 posts. In operation, the 30-cell battery is connected to the bind- 

 ing-posts at the middle' of the board, the lighting circuit to the 

 upper pair of binding-posts, and the charging circuit to the lower 

 pair. In charging the battery, a current of exactly the right po- 



.arc-lamps, single and double, are of simple construction, and 

 steady and positive in action. A double lamp and its mechanism 

 are shown in Figs. 5 and 7. The form of voltmeter and ammeter 

 manufactured and used by the Mutual Electric Company is shown 

 at Fig. 6. 



This company now claims to have ready for the public a com- 

 plete storage-battery system, an incandescent-light system, a trac- 

 tion system for street-cars, a car-lighting system, an arc-light 

 system, a combination system, and a fire-alarm system, — all 

 worked out by Mr. Knowles, electrical engineer of the company. 



