The Stanley No.13 Circumference, Compass or Circular Plane is 10 ½" long
with a 1 ¾" cutter.
These planes are fitted with flexible spring steel faces for planing
convex and concave surfaces.
The sole of this plane is flexed manually after loosening the ring screws,
front and back, and pushing or pulling the front and back of the sole.
The screws are tightened again against the steel straps that are hinged to the
toe and heel of the sole to hold it in the desired curve.
This one, a type 2 dates from between 1871
– 1879.
The Type 1 (1867-1871) and Type 2 had their soles screwed to the body from
underneath
(shown in next image) also, the solid brass nut for adjusting depth of
cut is used. On the nut is impressed the words, Bailey's Patent - Aug
31 1858 - Aug 6 1867.
After 1879, Sargent's patent was used to fix the sole to the main body
using a dovetail arrangement as shown below, the dovetail piece being riveted to the sole.
In this Type 3 you can see the steel dovetail part joining the sole to
the lower body.
Also just noticible, the brass adjuster nut is now hollow.
This was added to later Type 2s.
There is still no lateral adjustment lever on this model.
After 1884, Traut's patent lateral adjuster was added but due to the awkwardness involved
in setting the curve in the sole of this model, the more easily adjusted No.113 became more popular.