Measuring scale

Measuring scale. Marked with a Hydrographic Office number, S78.

Graduated on both sides to 1/10"
Five adjustments each side to 1/100" (Diagonal scale?)
Hydrographic scale.

Object Details

ID: NAV0623
Type: Measuring scale
Display location: Not on display
Creator: Unknown
Date made: circa 1840; circa 1850
Credit: National Maritime Museum, Greenwich, London
Measurements: Overall: 3 mm x 1227 mm x 46 mm