There cannot be mental atrophy in any person who continues to observe, to remember what he observes, and to seek answers for his unceasing hows and whys about things.

There are two critical points in every aerial flight-its beginning and its end.

Grand telegraphic discovery today … Transmitted vocal sounds for the first time ... With some further modification I hope we may be enabled to distinguish … the “timbre” of the sound. Should this be so, conversation viva voce by telegraph will be a fait accompli.

Concentrate all your thoughts upon the work at hand. The sun's rays do not burn until brought to a focus.

It is the man who carefully advances step by step...who is bound to succeed in the greatest degree.

With every door that closes a new one opens.

Washington is no place in which to carry out inventions