In my never ending quest to find a Prince Rupert’s Drop, I happened to stumble on the following conversation:
http://antoine.fsu.umd.edu/college/chemistry/senese/chemed-l/199807/msg00244.html
Can someone tell me what type of “catalog” has these things?
::Bump::
I’m curious about this as well. I’ve heard of these, but I’ve never seen a demonstration.
Kind of bumping this too, but I’ll add a little context.
In Dippy little question about “Oscar and Lucinda” sethdallob asked for the name of these glass objects, which reminded me of the novel and the object as well as allowing me a shortcut in oldscratch’s The Brand Spanking New Harvey Keitel Penis Game. Celyn’s answer to sethdallob also enabled me to discover that the fabulous Brewer’s Dictionary of Phrase and Fable is online at bibliomania.
Now awaiting further tidbits from this happy line of enquiry. 
This sounds like the type of thing you might find in a science catalog.
I made some many years ago. I melted the end of a glass rod and let the drops fall into motor oil. Most of the ones that hardened into teardrops with a little tail would perform properly. I used an oxyacetylene torch but a propane torch might work.
Sorry to bring this to the top again, but there were afew people who were interested in finding these, and, like an idiot, I deleted their email address. With a little help from a few science teachers, I found them, and they are surprisingly cheap! A pack of 12 is $31 with shipping.