Blackboard memorandum: Henry Alger's 'Patent Scholastic Blackboard'

Reference code
FOL.UFSC/7/6/1/2
Level of description
Item
Title
Blackboard memorandum: Henry Alger's 'Patent Scholastic Blackboard'
Scope and content
A memo from Henry Alger detailing his 'Patent Scholastic Blackboard.' It describes the blackboard and features, with three pages of illustration showcasing the design.