Simple Machines Gear Rack Model Pack Size_12 Wall-mountable beech wood draining rack

Wall-mountable beech wood draining rack measures 20 x 20 inches and holds up to 90 pieces of labware inverted for post-wash drying in chemistry labs

Cork-lined stainless steel safety flask tongs lock jaws around flask necks to prevent accidental drops during transfer of hot distillation vessels between bench stations

Two pith balls suspended on unspun silk from a brass pillar

Ratchet-stopped nickel-plated brass 25 mm micrometer screw gauge reading to 0

Simple Machines Gear Rack Model Pack Size_12 Wall-mountable beech wood draining rackRotation to linear gear rack simple machine model converting circular gear motion into straight line rack travel, demonstrating the mechanism behind crankshaft pistons and steering racks.