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).
Tube demonstrating sound interference
This instrument, together with many others, was given to the University of Athens by Germany as part of World War I reparations.
Used at the laboratories of the Faculty of Physics and Mathematics.