Sloping Pear-Shape Splash Head, 29/32 Flask and 29/32 Condenser Cones, Borosilicate Glass Base Size_8 x 8" Painted red and blue along

Painted red and blue along their lengths to mark north and south poles

Flame-heated thermal-expansion demonstrator with a 19mm metal ball dropping through a matched ring when cool

Flexible joint allows the model to move through knee flexion and extension

the universal gate from which any other Boolean function can be built in digital-electronics work

wheel-and-axle

Sloping Pear-Shape Splash Head, 29/32 Flask and 29/32 Condenser Cones, Borosilicate Glass Base Size_8 x 8" Painted red and blue alongSloping pear shape splash head in borosilicate glass fits 29 32 flask with cone sizing for vacuum distillation with splash prevention.