Error message

Deprecated function: Creation of dynamic property MergeQuery::$condition is deprecated in MergeQuery->__construct() (line 1357 of /home/UiaQ64igiG0ni2KR/hasi_gr/public_html/includes/database/query.inc).
Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1887 of /home/UiaQ64igiG0ni2KR/hasi_gr/public_html/includes/database/query.inc).
Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1887 of /home/UiaQ64igiG0ni2KR/hasi_gr/public_html/includes/database/query.inc).
Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1887 of /home/UiaQ64igiG0ni2KR/hasi_gr/public_html/includes/database/query.inc).
Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1887 of /home/UiaQ64igiG0ni2KR/hasi_gr/public_html/includes/database/query.inc).

Apparatus for showing the uniform pressure of air in all directions

This apparatus is set in a vacuum pump and the rubber in the four openings contort showing that pressure of air is uniform.

Data

AER23

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