hot bed

an area having rails or rolls on which rolled pieces are laid to cool.

Origin of hot bed

First recorded in 1620–30

In the hot-bed, made in February or March (in the latitude of Philadelphia), all tender things may be started.

Farm Gardening with Hints on Cheap Manuring |Anonymous
The seed should be sown at least a month in advance, and should be brought forward on a hot-bed or in a cool part of a stove.

The Culture of Vegetables and Flowers From Seeds and Roots, 16th Edition |Sutton and Sons
Perhaps foreign air and warmer climates develop, like a hot-bed, our innate instinct of destructiveness.

Sword and Gown |George A. Lawrence
Some may be planted in pots to flower in the house, or they may be placed in the hot-bed for early flowering.

The Book of Sports: |William Martin

He ordered things under glass, so that his table, at midnight or thereabouts, resembled a hot-bed that favors the bell system.

The Best Short Stories of 1917 |Various