A tambour is a device used in embroidery. It is comprised of two hoops which fit closely one inside the other. Fabric is stretched over the tambour which then holds it fast so that it may be embroidered. Research Tambour
In fortifications a tambour is a work usually in the form of a redan, to enclose a space before a door or staircase, or at the gorge of a larger work. It was arranged like a stockade. Research Tambour
 
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