F.139 Data Sheet MJS-p-0059

Jacob and Halse, Sector, 1809

Serial Number or Date Stamp:

Country: UK Primary construction material: iv Case included?: no

General Description: Early linear sector slide rule

Length of 1 decade = 5 in, and overall scale length = 10 in. The largest physical dimension is 12 in.

Front Scales: in L S C POL

Back Scales: S T T T S N

Notes: beautiful but warn; J&H in business 1809-1810; note from owner dated 1861; 6in when folded, log scale is an A of 9.75in

References: JOSvol6no2 (1997); Directory of British Scientific Instrument Makers 1550-1851

Date Acquired: 12/13/2019