This iron contraption is a spring board used in the traditional game of Knur and Spell. The iron spikes would be hammered into soft ground. The flexible steel bar clips under the wooden block and has a socket to hold the knur (ball). The player would then hit the block with the spell (bat) to release the knur into the air and then try and hit it as far as possible. Knur and spell was sometimes referred to as "poor man's golf" and was a sport played on moorland in Yorkshire and elsewhere in northern England. It was played on Hunslet Moor, Leeds, throughout the 19th century.