Set of 50 Rocks Cardboard Box Material_Borosilicate Glass and projection screen

and projection screen

Jolly bulb is 60mm diameter and is directly connected to a bourdon gauge

98-inch outer diameter sit on a needle-supported balance bar

producing the stroboscopic effect that visually freezes vibrating or rotating objects when the disc speed matches their frequency

Mounted light-dependent resistor with terminal connections

Set of 50 Rocks Cardboard Box Material_Borosilicate Glass and projection screenSet of 50 Collections. Each specimen labelled with name. Set of 50 Collections of Igneous, Sedimentary, Metamorphic rocks containing different rock specimens supplied in carboard box. Each specimen labelled with name.