Three-legged, clear plastic tool is designed so that the angles of each leg correspond with the angles of psychometric chart construction for each of the three required scales. The appropriate edges are tapered to the chart surface

De Angelo, F. T.

English

NASA Technical Reports Server

4October 1969	 Brief 69-10527 
NASA TECH BRIEF 
- --1;_e-	 ----------- - ---
NASA Teèh Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Tool for Readin g Psvchrometric Charts 
Psychrometric Chart Reading Tool 
The problem: 
Develop an improved, more direct method of ob-
taining data from psychrometric charts. 
The solution: 
Make a three-legged, clear plastic tool as shown in 
the drawing, so that the angles of each leg correspond 
with the angles of psychrometric chart construction 
for each of the three required scales. Taper the read-
ing edges, uppermost surfaces on two of the legs and 
the left surface on the vertical leg, to the chart con-
tact surface. 
How it's done: 
Align the upward extending leg of the tool with the 
wet bulb temperature scale and the left side of the 
downward leg with the dry bulb temperature scale of 
the psychrometric chart. At the intersection of these 
AdIkk	 (continued overleafl 
This document was prepared under the sponsorship of the National	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States	 will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19690000501 2020-03-16T18:05:54+00:00Z
two chart locations, follow the horizontal line to the 
right scale of the chart and read grains of moisture 
per pound of dry air directly. 
Notes: 
1. Design and use of this tool will be of interest to air 
conditioning, heating, aerospace, chemical, and 
meteorological industries. 
2. A similar tool can be used with any three-variabl 
type chart. In general, a suitable instrument can 
be constructed to assist in reading almost any com-
plicated chart. 
3. No further documentation is available. Inquiries 
may be directed to: 
Technology Utilization Officer 
Kennedy Space Center 
Kennedy Space Center, Florida 32899 
Reference: B69-10527
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to NASA, Code GP, 
Washington, D.C. 20546 
Source: Frank T. De Angelo of

The Boeing Company

under contract to

Kennedy Space Center
(KSC- 10358) 
Brief 69-10527	 Category 05


Tool for reading psychrometric charts

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