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An Ink Recording Oscillograph for Steady State A.C. Phenomena in the Audio Range


Pierce, John Robinson (1936) An Ink Recording Oscillograph for Steady State A.C. Phenomena in the Audio Range. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/F2B9-4M08.


An oscillograph has been designed and constructed which will reproduce in ink on paper tape the wave form of steady state a.c. voltages or currents in the frequency range 50 to 25,000 cycles. The tracing is done at a speed of approximately 1 cycle in 3 seconds, and represents a recording of the instantaneous voltage or current progressively at different phase positions in the cycle.

The principle of the device is that of the Rosa curve tracer, but operation has been made automatic by the introduction of several new features, including an electrical phase shifter, a new type of electronic switch, and a recording milliammeter.

The sources of error in the apparatus are analyzed and are shown to be reasonably small in magnitude and the error capable of further reduction.

An appendix describes the use of the instrument as an harmonic analyzer.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Electrical Engineering
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Electrical Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Maxstadt, Francis W.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1936
Record Number:CaltechETD:etd-06252004-100232
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2722
Deposited By: Imported from ETD-db
Deposited On:28 Jun 2004
Last Modified:03 Oct 2019 23:20

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