RGB/CMY Mounted Color Filter Set, 50 x 50mm, 6-Piece Racks & Stands_Flask Stands the flywheel light enough to

the flywheel light enough to drive by breath for hands-on reciprocating-engine study

Rotary-knob resistance substitution board offering twelve discrete values from 33 ohms to 10M ohms with 4mm lead connections

and physics principles in classroom investigations

this Brownlee-pattern apparatus gives a clean visual proof of the 2:1 stoichiometry of water decomposition

tightened with an Allen wrench for constructing lattice frameworks on laboratory benches

RGB/CMY Mounted Color Filter Set, 50 x 50mm, 6-Piece Racks & Stands_Flask Stands the flywheel light enough toThree primaries (red, blue, green) and three secondaries (cyan, magenta, yellow) sit in 50 x 50mm mounts, supporting both additive and subtractive color demonstrations in optical box setups.