Regnault's Hypsometer prop65 including 100 long flexible bonds

including 100 long flexible bonds for delocalized representations and crystal-lattice construction at scale

and logic-circuit demonstrations

paired with a 13 mm curved enamel-coated steel blade for portable benchtop and laboratory measurement tasks

the 90-45-45-degree faces redirecting wider beams for total internal reflection and image-inversion work

Sodium chloride lattice kit with 27 color-coded gray and green atoms plus 54 connectors for building the full cubic NaCl crystal structure in three dimensions

Regnault's Hypsometer prop65 including 100 long flexible bondsDouble walled copper cylinder hypsometer at 34 by 6cm on a steam boiler, with thermometer tubulure and glass manometer for calibrating thermometer upper fixed points under steam.