Graph measuring percentage of efficiency and impedance

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Image Details

Description	Graph measuring percentage of efficiency and impedance
Date of Creation	c.1910
Creator	Unknown
Archive Reference	LAN/2/15/6
Transcript
Transcript (continued)
Title	Graph measuring percentage of efficiency and impedance
Media	Lantern slide
Dimensions	N/A
Keywords	Frederick William Lanchester; Lanchester speaker; Lanchester; Speaker