Wooden Frame Abacus, 5 Steel Wires Subcategory_Temperature and Heat Hand-cranked worm-and-wheel drive with a

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

Eleven-ohm 5A air-cooled rheostat with constantan winding on a 300x44mm vitreous-enameled steel tube and a slide-bar carriage carrying a phosphor-bronze contact

Used to demonstrate temperature-dependent resistance

Three-hundred-thirty-ohm 0

Synchronizes strobe pulses to wave drive across 0

Wooden Frame Abacus, 5 Steel Wires Subcategory_Temperature and Heat Hand-cranked worm-and-wheel drive with aWooden framed abacus with five steel wires and 20 beads per wire on a 13. 5 by 9. 5 inch base, a smaller range counting tool for introductory arithmetic and place value work.