Caltech Library System

About | Browse | Search | Caltech Student Instructions

Type of Document	Dissertation
Author	Pierce, John Robinson
URN	etd-06252004-100232
Persistent URL	http://resolver.caltech.edu/CaltechETD:etd-06252004-100232
Title	An ink recording oscillograph for steady state A.C. phenomena in the audio range
Degree	PhD
Option	Electrical Engineering
Advisory Committee	Advisor Name Title Francis W. Maxstadt Committee Member
Keywords	none
Date of Defense	1936-01-01
Availability	unrestricted
Abstract 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.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    Pierce_jr_1936.pdf 3.10 Mb 00:14:21 00:07:22 00:06:27 00:03:13 00:00:16