US$ 136.00
diffraction
and ray-tracing demos
Rotary-knob resistance substitution board offering twelve discrete values from 33 ohms to 10M ohms with 4mm lead connections
and vascular cylinder for plant anatomy and absorption teaching
an Erlenmeyer flask
Working Steam Engine Model with Piston and Slide Valve Stock Type_Stocked diffractionCutaway working steam engine model with piston, slide valve, and link motion reversing mechanism, the flywheel light enough to drive by breath for hands on reciprocating engine study.
US$ 136.00
US$ 156.00
US$ 149.00
US$ 176.00
US$ 153.00
US$ 229.00
US$ 343.00
US$ 156.00
US$ 384.00
US$ 379.00
US$ 428.00
US$ 198.00