Open Top Cylindrical Dropping Funnel with Glass Key Stopcock, 250mL, Ungraduated, Borosilicate Glass Chemical_Fine White Sand and lead threading onto string

and lead threading onto string or rod for mass-dependent pendulum period comparisons

Two-prong single-adjustable universal clamp with an integral bosshead and non-slip vinyl sleeves

Very long-focal 75mm double-concave glass lens at 500mm focal length

Labeled-terminal 50-ohm resistance unit at 7

offering flexible positioning during force

Open Top Cylindrical Dropping Funnel with Glass Key Stopcock, 250mL, Ungraduated, Borosilicate Glass Chemical_Fine White Sand and lead threading onto stringOpen top cylindrical dropping funnel in borosilicate glass holds 250mL with glass key stopcock for controlled liquid addition procedures.