2.125" Cast Iron Closed Ring with Boss Head Clamp Science at Home_Elementary Science Hand-cranked worm-and-wheel drive with a

Hand-cranked worm-and-wheel drive with a rotation dial between clear acrylic plates

Largest metal displacement vessel in the series at 225 by 125mm with a side spout

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

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

and cylindrical-optics demos

2.125" Cast Iron Closed Ring with Boss Head Clamp Science at Home_Elementary Science Hand-cranked worm-and-wheel drive with aCast 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.