This German silver protractor is in the shape of a quarter-circle. It is divided by half-degrees and marked by tens from 0° to 90°. Flat bars extend on both sides of the protractor. A movable arm ...

PITTSBURGH (KDKA) -- Unless you're an architect or an engineer, it's probably been years since you last used a protractor in geometry class. But, now the semi-circular tool is showing up in some odd ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This yellow xylonite (celluloid-like ...