F.289 Data Sheet MJS-p-0165

Relay-Ricoh, F-686, 1961

Serial Number or Date Stamp: J.S-3

Country: JPN Primary construction material: bb Case included?: yes

General Description: Advanced linear log-log trig/decitrig vector/hyperbolic duplex slide rule

Length of 1 decade = 10 in, and overall scale length = 10 in. The largest physical dimension is 10 in.

Front Scales: Tr1 Tr2 P’ P [ Q ST Sr Stheta C ] D LL01 LL02 LL03

Back Scales: Sh1 Sh2 DF A [ B CF Th CI C ] D LL3 LL2 db

Notes: Lafayette F-686, Vector Log rule; nice condition

References: https://www.sliderulemuseum.com/Ricoh.htm, https://sliderulemuseum.com/SR_Dates.htm#Relay

Date Acquired: 12/17/2020