714 OBSERVATIONS AND ANALYSIS 
D and zp are now used for aircraft observations and 
reports. Similarly, thermodynamic diagrams are now 
being transmitted by facsimile. This transmission could 
probably be improved by altering its form to that of an 
isometric map. It might also be advisable to transmit 
all upper-air wind observations in a similar fashion 
with the present facsimile facilities. Finally, in view of 
the flexibility of direct-writer equipment in comparison 
to facsimile equipment, the former should be developed 
for the communication of weather information. 
REFERENCES 
1. Bevuamy, J. C., “The Use of Pressure Altitude and Al- 
timeter Corrections in Meteorology.” J. Meteor., 2:1-79 
(1945). 
2. —— Graphical Representations of Meteorological Observa- 
tions: Preliminary Report. Dept. Meteor. Univ. Chicago, 
Mimeogr. Rep., 1947. 
8. Cook RresEarcuH LABORATORIES, CHIcAGo. Graphical Repre- 
sentation of U. S. Weather Observations. Red Bank, N. J., 
Watson Laboratories Contract No. W28-099-ac-394, 1949. 
