Posted 1 year ago
fortapache
(3423 items)
Judging by the fashion it looks like circa 1970. And once again Skil Craft featured a boy and a girl as opposed to just boys as their competitor Gilbert did. This of course is a Geology set. It came with a fine set of various rocks/minerals along with a special scale and some this and that. The scale, seen in photo #3, is called a Jolly Scale and is used to to measure specific gravity. Not quite sure what that is, probably has something to density..
One note about this set is that is difficult to open as the contents all fall out as the specific gravity works against them.
The Jolly Balance was invented by the ever-popular German physicist Philipp von Jolly in 1864.
Thank you very much Falcon for the information.
You are welcome!
https://www.youtube.com/watch?v=XfSCm6DD4Go
Thank you falcon even if it makes my head hurt.