Gunter's scales

inscribed: MADE BY WILLIAM PLACE 1694 / FOR BENIAMEN PHILLIAPS

Scales front
I (inches)
C (chords)
R (rhumbs)
L (longitude? - but linear - tbc)

Back scales
E (equal parts)
M (meridian)
N (number)
S (sin)
T (tan)
STP (= sine of rhumbs) why this notation?
+ unmarked gunner's scale(?) - 17, 26, 35, 4 (= 40?) - weight scale for gunnery? numbers are strange

Object Details

ID: NAV0116
Type: Gunter's scales
Display location: Not on display
Creator: Place, William
Date made: 1694
Credit: National Maritime Museum, Greenwich, London
Measurements: 5 mm x 610 mm x 40 mm