Faraday to John Frederick William Herschel and note   22 December 1845

Royal Institution | Decr. 22, 1845

I have reason from experiment to think that a ray is not indifferent as to its line of path but has different properties in its two directions and that by opposing rays end ways new results will be obtained[.] I have ordered apparatus already for the experimental investigation of this point and only want time.

I have already made a certain progress in the endeavour to obtain Electric currents or magnetic force from light by the use of circular polarizarion natural and constrained and also on other principles which I need not advert to here.

M. Faraday