Word: imperfectly
(lookup in dictionary)
(lookup stats)
Dates: during 1890-1899
Sort By: most recent first
(reverse)
Fuel is one of the most important sources of energy, and has been ever since the invention of the steam engine; but even now the methods of utilizing it are very imperfect. In the best engines only about one-fifth of the energy of the coal is made use of. Wind has long been used as a source of energy and its use is increasing especially on land. Owing to the inconstancy of the wind, if it is to be used much in the future, it will probably be in connection with the storage battery...