Cylinder Stops
"Be it known that we, Joseph Gruler and Augustus Rebetey, of the city of Norwich, in the
county of New London and the state of Connecticut, have invented certain new and
useful improvements in Revolving or Repeating Fire-Arms" [U.S. Patent No. 26,641]
In December 1859 Joseph
Gruler and Augustus Rebetey,
on behalf of the Manhattan
Firearms Manufacturing
Company, received a patent
that would make the
Manhattan firearm both
distinctive and readily
identifiable.

The patent identified
additional recesses, or
cylinder stops "...thereby
effecting a self-acting lock of
the cylinder, midway or
otherwise between any two
cones." {Patent No. 26,641}

If the Manhattan has a 5-shot
cylinder, the cylinder will have
10 cylinder stops. If it has a
6-shot cylinder, there will be
12 sylinder stops. This feature
makes the Manhattan readily
identifiable even to the novice.
The cylinder stops are the indented rectangles located around
the circumference of the cylinder between the bottom of the
engraving and immediately in front of the nipples for the
percussion caps.

When Thomas K. Bacon left Manhattan to produce his very own
similar version of the Manhattan .31 caliber pocket pistol, his
design would not include the elements of this patent. As a result,
his pistols would have only one cylinder stop per chamber.