January 18, 2019 Case Studies: Giving Context to Fragments 7026 × 8480 Knife and sheath. Tuareg, Hoggar-Aïr, Algeria, late 19th or early 20th century. Knife: wood, iron, and brass; sheath: leather. Field Museum of Natural History, Chicago, IL, 175876. Photograph by John Weinstein Like this:Like Loading... Like this:Like Loading...