The wireless is also used to transmit the time from the great observatories.

With larger instruments, and in great observatories, this is not always the case.

The grand and scientifically perfected instruments of our great observatories show incalculable multitudes.

The illustrations are from photographs taken at the great observatories.

The great observatories, to which every intelligent eye is directed, are, in a measure, though innocently enough, responsible for this.

This enormous structure was built somewhat to one side of the great Observatories.