Photographs, experimental observations by Francis Gotch and Victor Horsley One page of six photographs 'obtained by projecting the image of the capillary electrometer upon a narrow slit behind which an extra rapid photographic plate travelled' during Gotch and Horsley's investigations into the electromotive changes in the mammalian spinal cord following electrical excitation of the cortex cerebri. Subject: Physiology / Neuroscience Drawings of the photographs were published in volume 45 of the Proceedings of the Royal Society alongside the paper 'Observations upon the electromotive changes in the mammalian spinal cord following electrical excitation of the cortex cerebri. Preliminary notice'. 1888