2.125" Cast Iron Closed Ring with Boss Head Clamp Science at Home_Elementary Science the complementary-polarity counterpart to NPN

the complementary-polarity counterpart to NPN for push-pull and bias-network demonstrations

this wool cloth is a standard accessory for electroscope and Van de Graaff work

providing the lowest-value reference in the line for low-resistance Ohm's-law and bridge work

Nine engraved 10 gram brass pieces and a 10 gram hanger on this slotted weight set

Wooden-frame abacus on a 13

2.125" Cast Iron Closed Ring with Boss Head Clamp Science at Home_Elementary Science the complementary-polarity counterpart to NPNCast iron closed ring clamp with an integrated boss head, combining a 2. 125 inch outer ring and a thumbscrew rod grip from 5 16 to 5 8 inch for small apparatus support.