Combination Dark Chamber for Phototropism Experiments, 21 x 7 x 7" Subcategory_Condensers Open-top cylindrical dropping funnel in

Open-top cylindrical dropping funnel in borosilicate glass holds 1000mL with PTFE key stopcock for large-volume controlled liquid addition

and rolling-motion experiments on inclined planes

opening to 2

Tangent-galvanometer instrument that derives current absolutely from compass-needle deflection against Earth's horizontal field

Economical minute timer setting intervals up to one hour via a top knob

Combination Dark Chamber for Phototropism Experiments, 21 x 7 x 7" Subcategory_Condensers Open-top cylindrical dropping funnel inEnclosed dark chamber with directional light ports houses seedlings under controlled conditions for phototropism, etiolation, and light direction response experiments.