His made his first stop to Nassau Hall on August 27, 1775. Boston 1775 has it covered:
In his diary Adams recorded his impressions:
The Colledge is a stone building about as large as that at New York [i.e., what is now Columbia]. It stands upon rising Ground and so commands a Prospect of the Country.
After Dinner Mr. [John] Pidgeon a student of Nassau Hall, Son of Mr. [John] Pidgeon of Watertown [actually Newton] from whom we brought a Letter, took a Walk with us and shewed us the Seat of Mr. [Richard] Stockton a Lawyer in this Place and one of the Council, and one of the Trustees of the Colledge. As we returned we met Mr. Euston [William Houston], the Professor of Mathematicks and natural Philosophy, who kindly invited Us to his Chamber. We went.
The Colledge is conveniently constructed. Instead of Entries across the Building, the Entries are from End to End, and the Chambers are on each side of the Entries. There are such Entries one above another in every Story. Each Chamber has 3 Windows, two studies, with one Window in each, and one Window between the studies to enlighten the Chamber.
Mr. Euston then shewed us the Library. It is not large, but has some good Books. He then led us into the Apparatus. Here we saw a most beautifull Machine, an Orrery, or Planetarium, constructed by Mr. [David] Writtenhouse of Philadelphia. It exhibits allmost every Motion in the astronomical World. The Motions of the Sun and all the Planetts with all their Satellites. The Eclipses of the Sun and Moon &c. He shewed us another orrery, which exhibits the true Inclination of the orbit of each of the Planetts to the Plane of the Ecliptic.
He then shewed Us the electrical Apparatus, which is the most compleat and elegant that I have seen. He charged the Bottle and attempted an Experiment, but the State of the Air was not favourable.
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