camera lucida: an optical device consisting of an attachment that enables an observer to view simultaneously the image and a drawing surface for sketching it
optical device: a device for producing or controlling light
gypsy: a member of a people with dark skin and hair who speak Romany and who traditionally live by seasonal work and fortunetelling; they are believed to have originated in northern India but now are living on all continents (but mostly in Europe, North Africa, and North America)