Popular science monthly . is a binding post D. The alarm-clock is mounted on asmall board, as shown in Fig. 2. Havethe brass springs sufficiently heavy andfar enough apart to permit the key, whenturning, to be held by the bend at thetop of the spring. The important partof the mechanism is the relay, whichturns off the current when the stove islighted. A buzzer or an old door-bell isshown at A, Fig. 3, with the hook Bsoldered on to the end of the piece of sheet metal C is bent snuglyaround the screw H, which has a shoul-der filed in it to prevent C from lyingon the board. A piece of
Popular science monthly . is a binding post D. The alarm-clock is mounted on asmall board, as shown in Fig. 2. Havethe brass springs sufficiently heavy andfar enough apart to permit the key, whenturning, to be held by the bend at thetop of the spring. The important partof the mechanism is the relay, whichturns off the current when the stove islighted. A buzzer or an old door-bell isshown at A, Fig. 3, with the hook Bsoldered on to the end of the piece of sheet metal C is bent snuglyaround the screw H, which has a shoul-der filed in it to prevent C from lyingon the board. A piece of brass, D, isbent as shown, with a hole drilled for thescrew E, which adjusts the tension ofD on C. The spring F tends to pull Cto the stop G out from under the springD. The wiring is shown by dotted lines. The action is as follows: The magnetA draws the armature B to its releases the spring C, which slidesslowly (its movement is regulated by thescrew E) out from under spring /-,causing a sliding contact of a few. dj %-4 ?M l-D : ?-G -1 i I A &!! -= Induction Coil •^ Prmary /Vrrs \ To S^iv Wiring diagram and connections (Fig. 4)to an alarm-clock for lighting an oil-stove seconds duration, which ends in discon-necting the primary circuit. Dampeningthe movement of the spring gives thespark time enough to to ignite (he coldoil.—.XRTiitR F. Stilson. What Radio Readers Want to Know Calculating Wavelengths; Circuits of Audion Amplifier; Helix for Spark-Coil E. B., Pittsburs, Pa., inquires: Q. I. I have a loading coil for an inductivelycoupled receiving luner consisting of 625 turnsof No. 22 enameled wire wound upon a tube5J in. in diameter, also a secondary loading coilwound with No. 27 enameled wire for a distanceof 7 in. on a similar size tube. Approximatelywhat is the wavelength of each? A. I. We cannot give the possible wave-length of a coil without knowing theconstants of the circuit in which it is to beemployed. It is easy to calculate the natu
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
