Clinton, Iowa. Blackboard in the Disher rooming house for railroad workers. It lists the names and room numbers of the men. This enables the "caller" to find the men and wake them. If men come in very late and go out very early they simply enclose their fifty cents in one of the envelopes, write their name on it, and drop it in the slot in the little box in the corner. Sourced from the Library of Congress.