Space & PhysicsObservations on the Transit of Mercury of May 6, 1878By Alfred M. Mayer, J. Walter Wood on June 1, 1878AdvertisementABOUT THE AUTHOR(S)Recent Articles by Alfred M. MayerAn Apparatus to Show, Simultaneously to Several Hearers, the Blending of the Sensations of Interrupted TonesStudies of the Phenomena of Simultaneous Contrast Color; and on a Photometer for Measuring the Intensities of Lights of Different ColorsStudies of the Phenomena of Simultaneous Contrast Color; And on a Photometer for Measuring the Intensities of Lights of Different Colors