PREPARATIONS FOR SOUNDING 1IBa= 1) 
either horizontally or vertically other than that exerted by the lifting 
lever. The camel hair brush should be rinsed in a good grade of de- 
natured alcohol once a week, or oftener if contaminated. For protection, 
it should be stored in a glass vial with the brush handle inserted through 
a cork, 
1093-51 
120 
MOLDED INSULATION CO 
PHILADELPHIA PA 
Figure B2-7. Radiosonde Commutator Bar 
15.4 The Detent. All baroswitch-pressure-contact settings will be made 
by use of the detent. The proportional part of a millibar corresponding 
to one click of the detentis the "detent click.'' Most pressure-calibration 
charts will have the detent click value enteredin the space provided. 
15.5 Pressure-Contact Setting. Make pressure-contact setting immedi- 
ately following the baseline-check and before disconnecting power. All 
baroswitch-pressure settings will be made by use of the detent screw. 
If a value has not been entered in the space, "one detent click equals 
MB," on the calibration chart, proceed as follows. If a value has 
been entered omit steps (d-j) below. To insure accurate settings, the 
radiosonde will be positioned so that a clear and uninterrupted signal is 
obtained. Lower the contact arm and proceed as follows: 
a. Obtain the baroswitch setting pressure in accordance with 
§B2-15.1. Record this pressure on the calibration chart as 
pressure (1). 
Is =o) FMH#3 
