---
title: 'Psychrometrical Table: for Determining the Elastic Force of Aqueous Vapor and the Relative Humidity of the Atmosphere'
type: pdf
hasMedia: true
requiresPurchase: false
authors:
- 'James Henry Coffin'
date: 1856-01-01
collection: 'Archives'
subcollection: '19th century'
url: https://confessional.org/archives/19th-century/coffin-1856-psychrometrical-table-for-determining-the-elastic-force-of-aqueous-vapor-and-the-relative-humidity-of-the-atmosphere
---

# Psychrometrical Table: for Determining the Elastic Force of Aqueous Vapor and the Relative Humidity of the Atmosphere

Smithsonian (1856) psychrometric tables by James H. Coffin presenting Regnault-based formulas and Fahrenheit-adapted tables to compute vapor pressure and relative humidity from wet- and dry-bulb readings.

[Download](https://media.confessional.org/archives/coffin-1856-psychrometrical-table-for-determining-the-elastic-force-of-aqueous-vapor-and-the-relative-humidity-of-the-atmosphere.pdf)