Counting Frame With Wooden Beads
This page is the CodyCross answer for the clue below from Physics, Group 1890, Puzzle 3 (Geiger Counter).
Question is: Counting Frame With Wooden Beads
and the answer is: ABACUS
Word Meaning:
ABACUS — (historical, obsolete) A table or tray scattered with sand which was used for calculating or drawing.
Definitions from Wiktionary.