US$ 106.50
visualizing the relationship between local motion and seismic recording for geology lessons
Wood-handled collecting net pairs a sturdy grip with fine mesh netting for classroom field trips and introductory entomology collection work
this 20mm-diameter steel helix carries longitudinal
and interference effects
Savart's Toothed Wheel Length_74mm visualizing the relationship between localFour 7. 5cm toothed wheels spaced 6mm apart on a common shaft, producing distinct audible pitches at varying spin speeds to relate rotational frequency to perceived sound frequency.
US$ 106.50
US$ 238.50
US$ 397.50
US$ 326.00
US$ 137.50
US$ 112.50
US$ 177.00
US$ 87.00