The microscope-centrifuge, recently described by Harvey and Loomis (1930), was devised in collaboration with Mr Alfred L. Loomis and constructed in his private laboratory at Tuxedo Park, N.Y. It is a device by which living cells can be observed while they are being centrifuged at speeds of 1000 to 4000 R.P.M. at a distance of 11 cm. from the centrifuge axis. The instrument is really a special head, containing part of a microscope, built to fit a 12 in. shaft, the size of the type SB International Equipment Company electric centrifuge. The scheme is as follows.

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