Measurements of the elastic electromagnetic form factor ratio<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mi>p</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>G</mml:mi></mml:mrow><mml:mrow><mml:mi>Ep</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo>/</mml:mo><mml:mi>G</mml:mi></mml:mrow><mml:mrow><mml:mi>Mp</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>via polarization transfer

We present measurements of the ratio of the proton elastic electromagnetic form factors, ${\ensuremath{\mu}}_{p}{G}_{\mathrm{Ep}}{/G}_{\mathrm{Mp}}.$ The Jefferson Lab Hall A Focal Plane Polarimeter was used to determine the longitudinal and transverse components of the recoil proton polarization in $\mathrm{ep}$ elastic scattering; the ratio of these polarization components is proportional to the ratio of the two form factors. These data reproduce the observation of Jones et al. [Phys. Rev. Lett. 84, 1398 (2000)], that the form factor ratio decreases significantly from unity above ${Q}^{2}=1 {\mathrm{GeV}}^{2}.$