Microtome Knife Sharpeners Operating on the Abrasive-ground Glass Principle

Developments in the abrasive-ground glass type of microtome knife sharpener have been traced from 1857 to the present. Merits and disadvantages of each apparatus are critically discussed, particularly of the two practical power sharpeners, namely, the horizontal revolving disc and the vertical wheel. A new vertical wheel model, designed to facilitate the sharpening of long, sliding microtome knives, either with a chisel-shaped or a symmetrical bevel, is described. Notable mechanical features include: shaft rotation V-slots as sole adjustable part, thereby assuring accuracy of alignment; steel guide bar 45.7 cm. long; glass wheel mounted on its own axis, separate from motor; simple and sturdy construction with single casting constituting entire framework.