Student mathematical notebook of Ebenezer Hill, 1785

This mathematical notebook of Ebenezer Hill was kept in 1795 while he was a student at Harvard College. The volume contains rules, definitions, problems, drawings, and tables on arithmetic, geometry, trigonometry, surveying, calculating distances, and dialing. Some of the exercises are illustrated by hand-drawn diagrams, including some of buildings and trees.

Letter from James Winthrop to William Bentley, 1785 June 11

Two octavo-sized leaves containing a two-page handwritten letter from Winthrop to Bentley discussing the purchase of the Pentaglot Lexicon from Professor Stephen Sewall, and recent book purchases.

Letter from James Winthrop to William Bentley, 1785 October 17

Two octavo-sized leaves containing a two-page handwritten letter from Winthrop to Bentley discussing Professor Eliphalet Pearson and the discovery of brass and copper coins in Medford, Mass.

Letter from James Winthrop to William Bentley, 1785 December 20

Two octavo-sized leaves containing a one-page handwritten letter from Winthrop to Bentley briefly mentioning the purchase of the Pentaglot Lexicon. The second leaf is torn and a fragment, but no text is missing.

Mathematics notebook : manuscript, 1785-1789

Sections on numeration, interest, square root, geometry and surveying with accompanying diagrams.