Slate (writing) Slate (writing) A slate is a thin piece of hard flat material, such as the rock also called slate, that is used as a medium for writing. The rock is “a metamorphic rock created by the recrystallization of the minerals in shale from clay to parallel-aligned, flat, flake-like minerals such as mica”. The writing slate consisted of a piece of slate, typically either 4x6 inches or 7x10 inches, encased in a wooden frame. A precise date range for writing slates of this type has not been established. Usually, a piece of cloth or slate sponge was used to clean it
Slate (magazine) working on a long, ambitious project of some sort," Plotz said in an interview. "Slate" introduced a paywall-based business model in 1998 that attracted up 20,000 subscribers but was later abandoned. A similar subscription model was implemented in April 2001 by "Slate"s independently owned competitor, Salon.com. "Slate" started a daily feature ”Today's Pictures” on November 30, 2005, which featured 15-20 photographs from the archive at Magnum Photos that share a common theme. The column also features two flash animated ”Interactive Essays” a month. "Slate" was nominated for four digital National Magazine Awards in 2011 and won the NMA for General