122 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1948 
eter strips will not deteriorate with time. Preliminary tests show 
it to be about three times as sensitive as the bolometers we are currently 
using. 
Work at Washington—The observations and computations from 
the Montezuma and Table Mountain field stations were carefully 
checked and appraised. Results for the calendar year 1947 were tabu- 
lated in the form given in table 24 of volume 6 of the Annals of the 
Astrophysical Observatory. 
Arrangements were completed for the preparation of new and com- 
pletely revised editions of the Smithsonian Meteorological Tables and 
the Smithsonian Physical Tables. Work on the Meteorological Tables 
is now in progress under the editorship of R. J. List, of the United 
States Weather Bureau. The Physical Tables will be edited beginning 
September 1, 1948, by Dr. William E. Forsythe, formerly of the Nela 
Research Laboratories, Cleveland, Ohio. 
The sun and sky radiation studies at Camp Lee, Va., under contract 
with the Office of the Quartermaster General, were terminated on 
January 1, 1947, at the completion of 2 full years of observations. 
These observations included continuous records of the total sun and 
sky radiation, and of the relative energy in the ultraviolet, visible, 
and infrared portions of the spectrum, as received on a horizontal sur- 
face, on a plane 45° to the east, and on a plane 45° to the south. Part 
of the instrumental equipment was left at Camp Lee, and observations 
are being continued there under the sponsorship of the Camp Lee 
Quartermaster Board. <A total of 16 reports were submitted to the 
Office of the Quartermaster General, summarizing the Smithsonian 
observations. 
Under an extension of the contract with the Office of the Quarter- 
master General, equipment for radiation measurements similar to 
those made at Camp Lee was prepared for the temporary sea-level sta- 
tion (Miami, Fla.), and for the high-altitude, dry station at Monte- 
zuma, Chile. These preparations were under the direction of Mr. 
Hoover, chief of the division. One difficulty encountered in the Camp 
Lee work was the great amount of time required to read and sum up the 
many daily records, and special efforts were made to devise an auto- 
matic integrator. Mr. Hoover succeeded in working out the details of 
such a device, and three were built by the instrument maker, Mr. Tal- 
bert. The device is now in successful operation at the Miami station. 
It separately sums up the reading of four different recording pyrheli- 
ometers as registered on a four-point Brown electronic potentiometer. 
By simply taking the readings on each of four counters, the total radia- 
tion received by each of the four pyrheliometers is obtained. The re- 
sults have repeatedly been checked against a complete reading of the 
record, and the integrator has proved surprisingly accurate. 
