30,000 to 60,000 pieces of ware were included in one firing. The company appears to have ceased operations in 1922. References In Pursuit of Beauty: Americans and the Aesthetic Movement, Metropolitan Museum of Art, pages 475-476, Jan 1, 1986. The Grove Encyclopedia of Decorative Arts, ed. Gordon Campbell, Oxford University Press, 2006. "Brief history of the Union Porcelain Works", The Pottery, Glass & Brass Salesman, New York, NY, United States, February 15, 1917, vol. 15, no. 3, p. 41-43, col. 1-2. "Union Porcelain Works proprietor, Thomas Smith, died.", The New York Times, New York, NY, United States, January 4, 1901, vol. 50, no. 15910, p. 7, col. 5. Nineteenth Century Brookly Potteries, TilesInNewYork blog with many photos Ceramics manufacturers of the United States