Rare 1930s Zimmermann Physiological Kymograph - Functional Vintage Scientific Instrument - Museum Grade This exceptional kymograph, manufactured by E. Zimmermann in Leipzig, Germany, in the 1930s, is a remarkable piece of scientific history. The Museu de Biociências Elisardo Vasquez (Brazil) state that only two similar pieces are known in their collections, making this model almost impossible to find on the market. Designed to record physiological phenomena such as blood pressure, muscle contractions, and nerve activity, this instrument represents the pinnacle of early 20th-century physiological research. Despite missing a few original accessories, including the smoke paper and outer casing, this kymograph is functional and well preserved, showcasing its original German inscriptions and controls. The intricate mechanical and electrical design highlights the ingenuity of vintage scientific instrumentation, making it a rare collectible for museums, historians, and scientific enthusiasts alike. Please note that the white power cable shown in the photos is not included. It is only for demonstration purposes, as it was used to test the electrical functionality of the instrument. This kymograph is sold as-is, suitable for collection, museum display, restoration, or educational purposes. A true historical artifact, it offers a tangible connection to the pioneering studies of cardiovascular and neuromuscular physiology conducted nearly a century ago. Its unique combination of mechanical precision, historical value, and visual appeal makes it a standout item in any collection of scientific antiques.