Heath, Janet Critcher, Charlotte Professional Microscope The Professional was McAllister's largest model. It was priced at $73.50 with two eyepieces, two objectives and a case in 1879. The most unusual feature of McAllister microscopes is the coarse focusing mechanism. Rather than using a rack and pinion, he used a fusee chain, similar to a miniature bicycle chain. Chain focusing was first introduced by Smith and Beck in the Universal model, but was not used in their other models. The captive gliding glass stage is also an unusual feature. LL02.48.01.23 22052 990 1880 eng three dimensional object microscopes Microscopes Medical instruments and apparatus Medical microscopy United States New York (State) New York (N.Y.) Microscopy Optical Devices T. H. McAllister creator Gift of Donald R. Hoffman This item has been made available for use in research, teaching, and private study. Researchers are responsible for using these materials in accordance with Title 17 of the United States Code and any other applicable statutes. If you are the creator or copyright holder of this item and would like it removed, please contact us at als_digitalcollections@ecu.edu. http://rightsstatements.org/vocab/InC-EDU/1.0/ Laupus Health Sciences History Collections hom Historic Microscope Collection micro Health and Medicine ham Manufacturing and Business mab LL02-48 Laupus History Collection Professional Microscope The Professional was McAllister's largest model. It was priced at $73.50 with two eyepieces, two objectives and a case in 1879. The most unusual feature of McAllister microscopes is the coarse focusing mechanism. Rather than using a rack and pinion, he used a fusee chain, similar to a miniature bicycle chain. Chain focusing was first introduced by Smith and Beck in the Universal model, but was not used in their other models. The captive gliding glass stage is also an unusual feature. T. H. McAllister Microscopes 1880 PhysicalObject microscopes J. Y. Joyner Library, East Carolina University eng 22052 http://rightsstatements.org/vocab/InC-EDU/1.0/ Medical instruments and apparatus Medical microscopy United States--New York (State)--New York (N.Y.) Microscopy Optical Devices local, filename 22052.0001 4432313 image/jpeg 6.0 PRONOM PUID: fmt/10 big endian uncompressed MD5 b854ca1718263f1f36dcb970af03b174 ecu:digital_collections 2304 3072 YCbCr mm mm 20110425 object plane in. 72 1 72 1 8 8 8 integer 3 internal