Mechanical Stop Watch, 1/10 Second Subcategory_Boiling Flasks well suited to demonstrating the

well suited to demonstrating the force on a current-carrying conductor in a magnetic field

this Brownlee-pattern apparatus gives a clean visual proof of the 2:1 stoichiometry of water decomposition

high-temperature grid flame for chemistry ashing

separation

dropping resistance as temperature rises and giving an introduction to temperature-dependent semiconductor sensors

Mechanical Stop Watch, 1/10 Second Subcategory_Boiling Flasks well suited to demonstrating theBattery free analog mechanical stopwatch reading to one tenth of a second, providing repeatable timing for physics classroom demonstrations and student laboratory experiments without power.