3m Wave Form Helix Spring for Wave Motion Demonstration Science Classroom Four-prong cork-lined retort clamp with

Four-prong cork-lined retort clamp with an integrated boss head

injection pump

Hand-painted 4-part human brain model separates into cortical hemispheres and brain-stem regions for lobed-anatomy teaching at introductory biology levels

Triple tandem plastic pulley with 25/38/50mm ball-bearing wheels on an open-sided 17

3m Wave Form Helix Spring for Wave Motion Demonstration Science Classroom Four-prong cork-lined retort clamp withClosing to 3m and extending to 9m, this 20mm diameter steel helix carries longitudinal, transverse, and standing waves visibly enough to compare amplitude, frequency, and S wave vs P wave behavior.