One of the important pieces of experimental work he carried during his time as Cavendish professor was a standardisation of the ohm. Maxwell and Chrystal had carried out experiments in Cambridge earlier and the apparatus was still available for Rayleigh. However the old equipment did not prove good enough to allow Rayleigh to obtain the accuracy he required and so he had new apparatus built.
Isa sa mga mahalagang piraso ng experimental trabaho siya natupad sa panahon ng kanyang panahon bilang II propesor ay isang standardisation ng oum. Maxwell at Chrystal had natupad eksperimento sa Cambridge mas maaga at ang kasangkapan ay magagamit pa rin para sa Rayleigh. Subalit ang mga lumang kagamitan ay hindi sapat upang patunayan ang magandang payagan Rayleigh upang makuha ang kawastuhan siya kailangan at kaya niya bagong kasangkapan na binuo.