. Electric railway journal . ge bat- An account was published in the issue of this paper forFeb. 25 of the Sangamo car watt-hour meter, in which therotating element is floated on mercury. The growing use of car meters will make ashort description of thisfeature of the Sangamocar meter of interest. In the meter the arma-ture floats in the mer-cury, a small solid non-metallic float being rivet-► ed to the center of the copper cisk so as to giveT^e necessary lifting effectlor the entire movingsystem, including the im-mersed armature, thealuminum damping diskand the shaft above, asshown in Fig. I.
. Electric railway journal . ge bat- An account was published in the issue of this paper forFeb. 25 of the Sangamo car watt-hour meter, in which therotating element is floated on mercury. The growing use of car meters will make ashort description of thisfeature of the Sangamocar meter of interest. In the meter the arma-ture floats in the mer-cury, a small solid non-metallic float being rivet-► ed to the center of the copper cisk so as to giveT^e necessary lifting effectlor the entire movingsystem, including the im-mersed armature, thealuminum damping diskand the shaft above, asshown in Fig. I. Byproperly proportioningthe amount of buoyancya very light pressure,or 1/10 oz., is exerted on the jewel bearingthe meters proof against the about 3 gramsat the top, thereby renderintransmission of shock to the moving system or jewel bearing. The variation in the amount of effective pressure upon thejewel between a temperature of no deg. above zero and 10 zero Fahrenheit, due to change of density of the mercury,.
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