- tone arm action. A technical term for a quantitative measure of case gain in the Scn processing of a preclear for a given unit of time. (ISE, p. 38)
- tone arm refers to the tone arm or its motion. (HCOB 13 Apr 64, Scn VI Part One Glossary of Terms)
- the total number of divisions down, a tone arm has moved accurately in a unit of time. (HCOB 24 Jul 64)
- a measure of the amount of encysted force which is leaving the case. ( SH Spec 291, 6308C06)