Quote Originally Posted by J.P. View Post
i rescued mine from a school laboratory that was throwing out their obsolete equipment.
i studied physics and they showed a lot of experiments using really old equipment. it never gets obsolete. for newtonian mechanics they fired a bullet into a block of wood hanging on a pendulum, and the rifle was really old, but the block of wood dated back to 1840 or something, it had notes on the back tracking its weight, and it got heavier over the decades because 2 bullets per year went into it. they also showed experiments with an x-ray emitter in a box made of 4 centimeter / 1.5 inch thick lead glass. i think the emitter was 40 years old or older, and the glass box looked ancient. some old things, a selected few, just keep working basically indefinitely until they break. only fools throw them away.