Harry Northwood began his career working in the glass industry in England. In 1881. He immigrated to the United States and opened H. Northwood in Wheeling, West Virginia, in 1902. In 1908, shortly after Fenton introduced their iridescent line, Northwood created theirs, calling it "Golden Iris", the color we know as marigold. About this time they added amethyst, cobalt blue, and green. In 1912, Northwood added the colors we call pastel, ice blue, ice green, and white. But Northwood is probably best known for their aqua opalescent glass, which they added around the same time. Harry Northwood died in 1918 and the factory ceased production in the early 1920's.
These beautiful purple/amethyst carnival glass tumblers, circa 1910, are the "Oriental Poppy" pattern. The tumblers are composed of eight arched panels and a huge embossed poppy blossom, buds and leaves on the front and back. The fabulous iridescent colors are gorgeous and each piece is marked "N" within a circle on the interior base of the tumbler. The tumblers measures 4 3/8" in height, 2 1/2" across the base and 2 7/8" across the top with no cracks, chips or repairs; near mint.