Eureka/Constantan Bare Wire, Model A Prong_4 Momentary-contact push-button switch on a

Momentary-contact push-button switch on a base with two 4mm terminals

a 45mm hollow equilateral acrylic prism holds varied liquids for refraction-index-by-medium investigations

one fitted with an exploder piston for impulse experiments

Acrylic-handled proof plane with a 96mm brass sampling disc

Larger 100 x 12 x 15mm Alnico horseshoe steps the pole-gap geometry up from the 75mm model

Eureka/Constantan Bare Wire, Model A Prong_4 Momentary-contact push-button switch on aSixteen SWG bare constantan wire on a 125g reel a copper nickel alloy with a low temperature coefficient that holds resistance steady across a wide temperature range.