Discoveries in the Physics & Astronomy shop | Science, curiosities, and surprises
Aside from the general vibe of “this is dangerous!,” this seems an odd sign.
Five-thousand volts, but use the minimum. Stick to a less dangerous danger?
Burn only when necessary? Presumably “necessary” gets defined elsewhere?
And, ooh, that blue mercury vapor. You’d think a UV warning could be number 4 on there, given its still-useful ability to sterilize hard-to-reach places. For your eyes’ sake, don’t look too long.
Stickers adhered to boxes of old chemistry equipment.
“For Laboratory Use Only / Not for use by children 12 and under”
Seems somewhat arbitrary, but then again, teenagers are known for their maturity and wisdom.
Don’t put your fingers into a high-voltage electrical socket when the power is on. Don’t do it when the power is off, just in case.
It’s not even clear why someone would do this when the entire apparatus is unplugged.
Just don’t go sticking fingers into places not meant for fingers, please.
Bar magnets, over time, lose some of their intensity. From time to time, a top-up’s in order, using this glorious little contraption.
Two magnets, a conducting bar, and the fantastic sound of BZZZZ-THUNK as those iron atoms line up. Cool!
Sometimes you stumble across little gems, squirreled away in the back closets, like these illuminance meters, acquired in March of 1964. Sadly, no cost etched into the side. Eventually, these were replaced with more modern versions, before being phased out of labs entirely.
We can guess how they were used – being next to a box of slide frames with a rainbow of color filters – and assume they’re not making a comeback. But check out all of that tiny, mid-century text crammed on there!
Especially intrigued at the specific note about newsprint requiring twice the incident light of other reading, writing, and general tasks.
When a table is wider than the doorway it’s meant to fit through, it’s time to get creative.
When that table top is for an optics setup, and weighs about 400 kg, creativity involves some sturdy equipment.
Step two: make certain it’s exactly where it wants to stay for the next decade or two.
Large and heavy coils of enamel-clad copper wire, which allow for tight, dense windings, are useful for demonstrating induced currents caused by a changing magnetic field. Students can spin magnets on a rubber band to produce enough electrical energy to light an LED. Not much, sure, but it’s still borderline magical.
Note that these hold up for a long time. Acquired in April of 1966 – just shy of six decades ago – and it’s still in regular use.
That $115.00 price marked on there? $1,171.89 in today’s dollars. Do you think we’ve recouped our investment?
When learning about the laws of Ohm and Kirchhoff, it helps to have some hands-on experimentation, wiring together batteries and resistors and tiny little incandescent bulbs. Try it, see what happens, measure your voltage and current. Simple enough, yet more satisfying and memorable than just drawing squiggles on paper.
Plus, you get to open and close the switch like a tiny Frederick Frankenstein! Just try to resist the urge to shout out “My Creation Lives!” too loudly.
Ah, the annual astronomy craters lab. Lots of sand, lots of color powder, a handful of marbles and ball bearings and slingshots. And a mess that’s really something to behold.
It’s definitely a “don’t wear your good clothes” sort of lab session.
And an “all hands on deck” cleanup effort.
It wasn’t unbreakable, but didn’t claim to be. Definitely didn’t shatter.