1-1000Ω Plug-Type Brass Resistance Box, 13 Coils Subcategory_Inorganic Compounds Compact all-metal boss head with

Compact all-metal boss head with two stainless steel thumb screws joins rods up to 15mm orthogonally

this natural gas Bunsen burner mounts on an extended anti-tip cast-iron base

Long-focal double-concave glass lens at 75mm diameter and 300mm focal length

designed to receive real images projected by lenses and concave mirrors during focal-length and magnification experiments on the optical bench

hand-cranked so students trace how shifter engagement alters gear ratios and output torque selection

1-1000Ω Plug-Type Brass Resistance Box, 13 Coils Subcategory_Inorganic Compounds Compact all-metal boss head withThirteen coil plug type resistance box covering 1 ohm to 1000 ohms with 2110 ohms total at plus or minus 0. 1% accuracy on double silk covered constantan windings, reference grade for bridge work.