Source details
Cayuga Museum of History and Art, custodian of the Case Research Lab collection
Page or archive reference: Inventing the 20 s(1920–1922), Measuring Daylight subsection, three complete body paragraphs: 1920 Kleerflax Linen Rug Company inquiry; Sponable/Leeds & Northrup discussions; suggested month-long daily measurement; Ted, Sponable and Gertrude Case monitoring. Proposal and performed monitoring are not a demonstrated successful commercial product.
Public draft citation only; private source and original research remain private.
Page or archive reference: Talking to Mars subsection: exhibit’s introduction and reproduced experiment account dated April 24, 1920; Case/Sponable, 24-inch mirror, star twinkling and no positive communication result. Original notebook and full context not independently collated.
Public draft citation only; private source and original research remain private.