Liquid Level Apparatus on Wooden Base, 8.5 x 5.5" Subcategory_Electricity and Circuits Four-socket E10 lamp holder pre-wired

Four-socket E10 lamp holder pre-wired in series on a hard-plastic base with two 4mm banana terminals

transmitting maximum light when their axes align and nearly extinguishing it when crossed at 90 degrees

Hinged-cover pocket compass with a 45mm dial graduated in degrees and a needle lock

letting students plot resonance against length and back-calculate the speed of sound

Liquid Level Apparatus on Wooden Base, 8.5 x 5.5" Subcategory_Electricity and Circuits Four-socket E10 lamp holder pre-wiredVisualizes that liquid seeks its own level regardless of container shape through interconnected vessels on an 8. 5 inch wooden base with a detachable design for easy draining.