3D Plant Cell Division (Meiosis) Model, 24 x 18", Hand-Painted Size_Small letting students vary the moment

letting students vary the moment arm distances on either side and find the balance point for any combination of masses

5cm coil diameter on a 5cm closed-length helix

Ranvier-pattern hand microtome uses a screw-thread mechanism for precise specimen advancement during thin-section cutting and microscope slide preparation

Eleven-ohm 5A air-cooled rheostat with constantan winding on a 300x44mm vitreous-enameled steel tube and a slide-bar carriage carrying a phosphor-bronze contact

3D Plant Cell Division (Meiosis) Model, 24 x 18", Hand-Painted Size_Small letting students vary the momentThree dimensional plant meiosis model traces chromosome pairing, crossing over, and reduction division through successive hand painted stages on a mounted base.