Signedstamped on the ratchet lever: R. PIETZSCH & CO. / PHILADELPHIA
stamped on ratchet wheel: WEIBACH & PIETZSCH / PHILADELPHIA
stamped on metal label on instrument base: EDW. PENNOCK / AGENT / PHIL'A, PA.
on label on box: FROM / EDWARD PENNOCK / Optical and Other Scientific Instruments / 3609 WOODLAND AVE. / PHILADELPHIA
Historical AttributesThis instrument was owned by Dr. Cecil K. Drinker when he was Professor of Physiology at the Harvard Medical School and Assistant Dean at the School of Public Health.
ProvenanceEdward Pennock, Philadephia; Dr. Cecil K. Drinker, Harvard Medical School, Boston, MA; Ernst-Lewis Collection of Microscopes, Harvard Medical School.