5 Desiccant tube cap
6 Battery cap
Figure 3. Case and cover surveying altimeter.
dition indicator (4) of filter paper impregnated with cobalt salt is inserted in the dial so that the observer has a means of
knowing when the desiccant is spent. When the desiccant condition indicator turns pink the silica gel should be removed,
dried, and replaced.
Case and Cover
The case (7, fig. 3) is the housing for the mechanism. It is made of aluminum and is 81,inches in diameter and 6
1/4 inches deep. Rubber shock