Slide rules HOME page COLLECTION 10" RULES UNITED KINGDOM
Make British Thornton, England
Model AD 050 Log Log
Notes

1.This has the patented Thornton trigonometrical scales.
2. For an article on the "differential" trig scales see the article by John Mosand (Two Unusual Types of Trigonometric Scales) by John Mosand in the Journal of the Oughtred Society, Vol. 9, No. 1, Spring 2000.
3. A copy of the instructions for use can be found here.

Front view
1003-thornton-ad050ll-01.jpg (32657 bytes)
Detail - front left
1003-thornton-ad050ll-02.jpg (24354 bytes)
Detail - front right
1003-thornton-ad050ll-03.jpg (17525 bytes)
Detail -front - inverse differential sines and tangents.
1003-thornton-ad050ll-04.jpg (20552 bytes)
Detail -front - differential sines and tangents.
1003-thornton-ad050ll-05.jpg (19189 bytes)
Manufacturing date >1967. Year British Thornton was formed.
Length 10"
Material Plastic, Simplex
Scales LL2,LL3,L,A[B,C1,ISd,ITd,Td,Sd,C]D,S,ST,T
Gauge points p: 3.14: A,B,C1,C,D
s: C
m: C
Cursor Plastic
Hair lines One