Neuro-Oncology
Oligodendroglioma
Apr. 19, 2024
This is an image preview.
Start a Free Account
to view the full image.
-
Nearly 3,000 illustrations, including video clips of neurologic disorders.
-
Every article is reviewed by our esteemed Editorial Board for accuracy and currency.
-
Full spectrum of neurology in 1,200 comprehensive articles.
-
Listen to MedLink on the go with Audio versions of each article.
Miners extracting ore from a mine (6)
Depiction of mining as part of a large, engraved plate concerning Liège, Belgium, by Bohemian graphic artist Wenceslaus Hollar (1607-1677), ca 1657. Horses are turning a capstan (note the vertical axle) to pull up ore from the mine. In early mining, this was called a whim, whim gin, or a horse capstan. A rope is wound around the drum, with both ends traversing several pulleys and hanging down the mine shaft. As the drum is turned around, one end of the rope is lowered, carrying an empty bucket, while the other one is raised, carrying a full load. Early whims were horse-powered, but later they were powered by waterwheels, or by steam engines beginning in the 18th century. (Courtesy of the Rijkmuseum, Amsterdam, The Netherlands. Public domain. Edited by Dr. Douglas J Lanska.)