Aluminum Plotting Compass, 38mm (1.5") Diameter Base Size_8 x 5" the longer focal value yielding

the longer focal value yielding milder divergence for subtler virtual-image reduction in optics work

Flexible spine model demonstrates vertebral movement

and density concepts without needing an electrical power source

Color-coded blue and red plastic cases on this bar-magnet pair (3 x 0

5 inch specific gravity cylinder with a top hook for density and specific-heat work

Aluminum Plotting Compass, 38mm (1.5") Diameter Base Size_8 x 5" the longer focal value yieldingAluminum cased plotting compass with a glass face and a dial marked with principal points, used to trace field lines around bar magnets and current carrying wires.