Parallelogram of Forces Apparatus with Pulleys and Weights, 26" Base_Octagonal and a motor accessory

and a motor accessory

and twelve 50g slotted weights for vector-addition work

Aluminum-handled collecting net swings lightweight through tall grass and air sweeps for classroom field trips and introductory entomology sampling work

this pack of premium qualitative filter paper offers medium-speed gravity filtration with a 10-micron pore size at 85 gsm weight

Parallelogram of Forces Apparatus with Pulleys and Weights, 26" Base_Octagonal and a motor accessoryParallelogram of forces apparatus on a 26 by 20 inch wall mountable board with two clamp on pulleys, iron nickel plated hangers, and twelve 50g slotted weights for vector addition work.