Red Slate Specimen Chemical_N-Butyl Alcohol Binocular compound microscope spans 40-400X

Binocular compound microscope spans 40-400X with achromat objectives and a mechanical stage for introductory biology and histology coursework

Unusual double-concave glass disc on a 125mm spinning base

conventionally representing oxygen at a bond terminus in molecular model structures

the smaller-tube counterpart to the 300x44mm standard rheostats with the same constantan-winding construction

vapor density

Red Slate Specimen Chemical_N-Butyl Alcohol Binocular compound microscope spans 40-400XRed hematite stained slate cleaves into flat sheets used historically for roofing, illustrating low grade metamorphism of iron rich shale protolith.