# The Struble-Einstein Correspondence

## TL;DR

This paper uncovers previously unpublished correspondence from 1947 discussing a potential observational test for Einstein's special relativity involving binary stars, highlighting the overlooked 'Struble effect' related to emission theory.

## Contribution

It introduces the 'Struble effect' as an overlooked observational test distinguishing special relativity from emission theory, with historical context and analysis.

## Key findings

- Identification of the 'Struble effect' as a Doppler effect in emission theory.
- Historical analysis of binary star tests of special relativity.
- Discussion of the overlooked observational test proposed in 1947.

## Abstract

This article presents hitherto unpublished correspondence of Struble in 1947 with Menger, Chandrasekhar, and eventually Einstein, about a possible observational test supporting Einstein's special relativity against Ritz's emission theory using binary stars. This `Struble effect,' an acceleration Doppler effect in emission theory, appears to have been overlooked, and the historical context, including de Sitter's binary star test of special relativity, is also discussed.