Popular Science monthly . abrasie ed owr l jusqu'thedisired finale est produite. Les cellules sèches et leur tension de pile sèche ordinaire THK showa doit de près d'une tension et une halfand un ofoviT lifliHMi test-courant en ampères, si c'est pour bedepended rinming inductioncoil sur lor une iiislrument ou similaire. Popular Science Monthly 447 comment débarrasser votre Cour de chats Ct)LE aimisement XSIUHR.15peut-être dorivfd tlcvice whicheffectually d'un RID de toute arrière-cour de straycats. Il y a beaucoup d'arc qui peuvent avoir de la tobe légèrement d'un confort ainsi qu'anamusement, si le nombre de ces felinenocturnal

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Popular science monthly . ed owr the abrasie until thedisired finish is produced. Dry Cells and Their Voltage THK ordinary dry cell should showa voltage of nearly one and a halfand an instantaneous test-current ofoviT lifliHMi amperes, if it is to bedepended upon lor rinming an inductioncoil or similar iiislrument. Popular Science Monthly 447 How to Rid Your Yard of Cats Ct)XSIUHR.15LE aimisement maybe dorivfd from a tlcvice whicheffectually rids any backyard of straycats. There arc many who may find it tobe somewhat of a comfort as well as anamusement, if the number of these felinenocturnal musicians in the neighborhoodis larger than is appreciated. Nail two copper wires along the top ofthe fence, i in. apart, care being takenthat they do not touch. Fasten them toinsulated wires leading to the secondaryof a spark-coil in the house. Connectthe coil in series with si.x or more batter-ies and a switch. When the cats appear on the fence, close the switch. The effect of theshock varies with the nature of the cat, . SparkCoiJ- Arrangement of Wires Along Fence Show-ing One Battery and Switch but in every case the cat will move on.A similar arrangement can be attachedto a garbage can, which must stand ona dry board. The wire leading to the canis insulated, and the other should begrounded.—Alexander Bollerer. To Stop the Milk Thief NO one need be deprived of creamfor his coffee by some hungrydividual who steals his milk bottlefrom the porch. The device shownhere will effectively prevent any suchoccurrence. The apparatus is connected with aswitch, bell and battery, and when anyone attempts to lift the milk bottle, the bell is rung. The bottle stands upon a metal diskto the center of which is joined a heaywire, which runs through the flooringwhere it terminates in a loop. Throughthis loop runs a flat spring, which ishelfl away from a large screw by theweight of the bottle. When the bottleis lifted the spring raises the disk and touches the large screw, forming acontact and

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• bookcentury1800
• bookdecade1870
• booksubjectscience
• bookyear1872