solar-heat

Air to be given on all favourable occasions, shutting up with as much solar heat as possible.

A good portion of solar heat to be secured by shutting up early.

There were the solar-heat mines—running at a slight loss—and various other fine achievements.

They are reached by well borings, and their brines are evaporated by solar heat and by boiling.

The duration in the past of Solar heat is necessarily bound up with the geological age.