Scientific American Volume 88 Number 25 (June 1903) . DIAGRAM OF THE PORTABLE OSCILLOGRAPH. The smaller instrument can be used separately. ing system mounted between the poles of a permanentmagnet. The vibrating system is connected to thetwo small terminals shown on the base of the oscillo-graph, and these in their turn are connected througha suitable resistance by means of flexible wires tothe terminals shown on the outside of the case. The vibrating system consists of a loop of phosphor-bronze strip under tension carrying a small mirror. Abeam of light from an incandescent lamp
Scientific American Volume 88 Number 25 (June 1903) . DIAGRAM OF THE PORTABLE OSCILLOGRAPH. The smaller instrument can be used separately. ing system mounted between the poles of a permanentmagnet. The vibrating system is connected to thetwo small terminals shown on the base of the oscillo-graph, and these in their turn are connected througha suitable resistance by means of flexible wires tothe terminals shown on the outside of the case. The vibrating system consists of a loop of phosphor-bronze strip under tension carrying a small mirror. Abeam of light from an incandescent lamp is thrown onto this mirror, and thence is reflected on to a screenforming a bright spot. This spot vibrates horizontally,its deflection from the central position being at anyinstant proportional to the instantaneous value of theP. D. or current as the case may be. The movementof this spot is observed in a mirror, which is rotatedby hand about an axis at right angles to that of themirror attached to the strip. The handle by meansof which the mirror is rotated is shown on the ri
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