Halogen 12V Replacement Bulb for Ray Box Subcategory_Bod Bottles sized for high-turn-count windings where

sized for high-turn-count windings where each turn adds little diameter to the coil core

mounted on cast iron with a wooden board and meter rule for column-height reading

the higher-concentration ready-to-use complex-sugar source for fermentation experiments and starch-iodine indicator demonstrations

Aluminum laboratory jack with 20 x 20cm plate supports vessels

Halogen 12V Replacement Bulb for Ray Box Subcategory_Bod Bottles sized for high-turn-count windings whereTwelve volt halogen replacement bulb for the wall powered ray box, supplying spares so optics demonstrations of reflection and refraction continue once the original burns out.