The Early Zenith Radios: The Battery Powered Table Sets 1922-1927 by Gilbert M. Hedge, Durrell M. Roth this is the essential reference

this is the essential reference guide

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The Early Zenith Radios: The Battery Powered Table Sets 1922-1927 by Gilbert M. Hedge, Durrell M. Roth this is the essential referenceTable of Contents Covering the tabletop battery radios built by Zenith, the Chicago based manufacturer, each radio is described in detail. Included are comprehensive functional descriptions on each set's operation, which uses color coded diagrams to aid in describing the circuits. Over 400 color photos and over 200 diagrams illustrate the thorough text. Each radio section includes a Quick Reference Guide. Previously unpublished information related to