A Sunlight Stove — Solar Energy For Warmth or Cooking

1878

A Sunlight Stove

It has been said that when we burn coal we really warm ourselves, or cook the dinner, by the rays of the sun which fell on the earth thousands of years ago — before the Pyramids of Egypt were erected, or Cleopatra's Needle cut out of the quarry. The heat and light of past ages are stored up in another form in the coal, which is fossil vegetation that when alive, as trees or gigantic ferns, owed its growth to the sun.

A successful attempt has now been made to store up the heat of the sun's rays for immediate and practical use. It was carried out in India, where the sun is, of course, much more powerful than here. The rays were first made to pass through glass fixed an inch away from the actual apparatus, which was consequently entirely surrounded by hot air. The enclosed apparatus, a copper receptacle, was blackened outside — a color which is well known to absorb heat, as any one may prove by wearing a black coat on a warm summer's day. The heat thus retained was further assisted by a conical reflector of silvered glass, and a quantity of mutton and vegetables placed within was perfectly cooked.

To further aid in retaining the absorbed heat when the apparatus was removed from the sunlight it was covered with a rug, as ladies place a "cosy" over the teapot to draw the tea. Since then the inventor has improved upon the process, and can now cook chops or steaks in the open air as quickly as by an ordinary fire, and entirely by the sun's rays. The most remarkable point is, perhaps, that the heat is kept in the apparatus for as long as three and a half hours.

In connection with this subject, just to test the power of the sun's rays in our own country, let any of our readers on a hot summer's day place their hand on the slate roofing of an accessible shed. Where they slope to the south, the slates will be found sometimes so extremely heated that the hand can hardly bear to touch them.