Specific Gravity Study, circa 1944

Clara Matynka, our CAMZ, saved her science class notes.
My guess is Kensington High freshman, 1944.

Brass weights are admittedly not as accurate, or as precise,
as modern scales with digital readouts to umpteen decimal places.
They did have the advantage, however,
of requiring physical contact by the student
with physical reality: masses that have, you know, weight.
And the student could see with her own eyes
how the balance worked.
I think this kind of directly-comprehensible
and directly-sensed equipment
should be retained in the mix
in all teaching labs.