The first three
photos show the movement and remontoire. All of the original arbors were square in profile
while the retrofits circular. The new third wheel attached to it's arbor retains the
original lantern pinion. This would have been attached to the original escape wheel arbor
whether this was with a crown or anchor escape wheel. Although the arbor is circular it
terminates in a square to fit the original pinion's hole. This pinion is attached to the
rocking frame making up the remontoire. Normally a rocking frame remontoire has a very
short period - typically 5 to 10 seconds. This is necessary as a longer period would
result in too far a swing for the rocking frame causing the pinion to leave the proper
meshing position on the wheel it engages. In this case the wheel and pinion are large and
the tooth profiles coarse; allowing for the longer 20 second period. A smaller clock with
finer wheels needs a shorter period as seen here.
The fourth photo shows the old style stirrup click system used in both main wheels. The
helical tooth- cut wheel (last photo) has the conversion date and maker's name. This too
is mounted to an original square arbor.