The contents of the records convey the foundation of the Rensselaer Society of Engineers (RSE) whose roots derive from the Pi Eta Scientific Society, founded in 1866. This collection contains a copy of the 1867 minute book (obtained by Samuel Rezneck in 1968). Membership directories, the 75th Anniversary Register, and invitation memorabilia highlight the society's social life. The substantial portion of scientific papers make up the bulk of this collection.