Department of Commerce 
Form 259 ELB J SBB 
VI-3/632g-3589 
l&utvziu of #tanharfrs 
A 4 Vv t 
FEB REPORT 
1 Paulin Altimeter 
submitted by 
on 
Smithsonian Institution 
(Mr. A. Wetmore) 
Washington, D.G. 
on 
February 7, 1931. 
Description of Instrument 
B.S.Serial No. 3589 
Ident. No. D-1097 
Maker: C.E.Johansson,, Sweden. 
Range: -900 to +9700 feet. 
Least Graduation: 10 feet. 
Least Reading: 5 feet. 
Diameter of Dial: 3 l/8 inches. 
Weight: 11 ounces. 
Tests 
Adjustment. When received, the instrument was found to 
read 145 feet high at atmospheric pressure. The pointer was 
reset to read approximately correct at a pressure of 29.90 
inches of mercury. 
Scale error test at room temperature . The instrument was 
clamped in position under a bell jar with an external connection 
to the center knob so that the tendency pointer could be sex to 
zero. The pressure was changed at an average rate of 1000 feet 
in five minutes. The pressure was held constant at the test 
points for two minutes and the reading of the instrument compared 
with the reading of a mercury barometer which was connected to 
the bell jar. The pressure was decreased from 30.90 inches to 
20.96 inches of mercury and then increased to 29.81 inches of 
mercury. 
