Original old electrical instruments industry trade magazine ad for LEEDS AND NORTHRUP COMPANY of Philadelphia, PA. Frequency and Time-Error On One Chart. Both system frequency and accumulated error between system time and standard clock time, are recorded simultaneously by a combined Micromax Frequency and Warren Telechron Time-Deviation Recorder, a typical chart sample is shown. This 1936 industry magazine advertisement would display beautifully matted and framed.
- SKU w898
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