Rotary Microtome Glass Flasks_Boiling Flasks a beginner-level counting tool for

a beginner-level counting tool for preschool and early-elementary number introduction

Tulgren filter funnel constructed from borosilicate glass extracts small organisms from soil samples through heat-driven migration collection methods

Transparent-cased 2V 20Ah lead-acid accumulator with removable handle and printed terminal markings

and 60mm sheaves on a 4-inch mounting rod

U-magnet and brass-rail apparatus that demonstrates the motor effect

Rotary Microtome Glass Flasks_Boiling Flasks a beginner-level counting tool forHeavy base with hinged cover for protecting the interior mechanism,and knife holder. A razor 120 mm made from heat treated steel and tested for Micro structure is supplied. Heavy base with hinged cover for protecting the interior mechanism,and knife holder. With every complete revolution of the drive wheel, the feed panel engaged the teeth of ratchet wheel which advances the object holder through cone and inclined plane mechanism. A safety device