thermograph

In 1894, along with journalist and pioneering meteorologist William Eddy, the scientists strapped a thermograph to a wooden board and used a kite to keep it aloft for over four hours, flying as high as 1,400 feet.

The bag was raised to the top of a six-foot snow mound, a thermograph being placed alongside.

The general care of the barograph is the same as that of the thermograph.

The other thermograph had evidently been constructed with a view to the tropics; at any rate, it would not go in the cold.

This was particularly annoying, because this thermograph had been working so well in low temperatures.

Well, it was an old meat-tin circulating inside the thermograph case.