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Briefly, the apparatus consists of two needles, one of which is inserted into a vein of the donor, the other into a vein of the recipient, and a U-shaped tube, at the midpoint of which is a pocket into which a hollow revolving plug is fitted. This plug is open at one end so as to accommodate the nozzle of a record syringe (the plug may be made to fit any other form of syringe desired), but is closed at its other end. the point of exit being in one side so as to correspond to the openings of the two arms of the U into the central pocket. The distal ends of the arms, then, fit into the needles which have been placed in the donor's and the recipient's vessels. A circuit having been completed in this manner, blood is withdrawn by means of a syringe from the donor,
Bernheim BM. A SIMPLE INSTRUMENT FOR THE INDIRECT TRANSFUSION OF BLOOD. JAMA. 1915;LXV(15):1278. doi:10.1001/jama.1915.25810150001018