Description
an O-ring seal
Continuously motor-driven to supply a steady high-voltage source
Hand-cranked cam turning against both a straight follower and a lever follower
Flexible spine model demonstrates vertebral movement
2mL graduations
Optically Worked Double Concave Glass Lens, 75mm Diameter, 300mm Focal Length Science at Home_Chemical Science an O-ring sealLong focal double concave glass lens at 75mm diameter and 300mm focal length, the moderate curvature spreading light gently for divergence and virtual image formation work in refraction demos.
Exchange/Return Notes
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