In the fall of 1898 she proposed to give, and the Trustees "voted to
accept with gratitude," "a 12" telescope and a simple building to house
the instrument." Then at a Trustees meeting the following May, "Mrs.
Whitin stated that she now proposes to construct the Observatory of
white marble in place of brick." When it was formally opened on October
8, 1900, Miss Hazard could report that it housed "a 12" refractor with
micrometer, polarizing photometer, and star and sun spectroscopes. A
Rowland concave grating spectroscope, of 6' focus, with its accompanying
heliostat, is set up in a room capable of being darkened completely. The
library is a beautiful room, and the dome by Warner and Swasey is all
that it should be.

I knew from the first that it was not large enough for the kind of work we wished to do, and that the nearest college residence hall was too far off for the astronomical staff to be present for the nightly vigil with the stars. Mrs. Whitin herself soon perceived this and of her own initiative began to think of an Observatory House, and an enlargement to the Observatory itself.
The beauty and costliness of what was already done seemed difficult to match. Various compromise building materials for the addition were discussed, but after many consultations with the architect, she declared that “marble and copper were good enough,” and by 1906 the observatory was doubled with increased equipment, and a house placed beside it, completing a harmonious group, and itself a lovely specimen of domestic architecture.