The
prime source of power was an overshot wheel, which turned mill stones,
grain elevators and powered sifters, etc. The mill building was
3 1/2 stories high with clearstory windows to divide its roof lines,
and its foundation wall in essence formed the bank of the river.
By the turn of the century, the riverfront mill area had become
the nucleus of a prosperous settlement, and a tannery, store and
fulling mill were also added.
After several years the grist mill was sold to millwright Asa Lewis
who operated it until his death in 1815. The mill thereafter changed
ownership frequently, and circa 1890 was converted to the use of
Hercules water turbines which powered a Robinson mill manufactured
by Munson Brothers, Utica, NY. It was operated with varying degrees
of commercial success up until the 1930's after which it was used
by a door and sash manufacturer and for storage and allowed to fall
into a state of profound disrepair.
In 1997 two local families formed Renaissance Mills of Littleton
LLC and undertook the restoration of the grist mill along with three
other mill buildings, thought
to be the oldest commercial building north of Concord, NH. The
goal was to restore the basic workings of the grist mill as a historically
accurate replica of the original, open the mill to the public as
a working museum and authentically restore the other mill buildings
as commercially viable retail and rental space, thus creating an
18th century riverfront complex.
Today the building sits on its original site, and the look and
feel of the original construction has been maintained wherever possible.
The exterior is clad in radially sawn spruce, the roof is hand-split
cedar shakes; wide pine flooring on the three floors is fastened
with wrought iron nails; 12 over l 2 true divided light windows
mimic the originals as do the clearstory windows on the third floor;
all hardware used is hand forged as are the interior and exterior
lanterns; the 55 foot chimney is replicated in used brick, and the
interior walls are covered with a plaster skim coat.

The same careful research was applied to the replication of the
working mill. The exterior undershot water wheel measures 20 feet
6 inches in diameter. Current regulations prohibit the construction
of a dam necessary to power an overshot wheel. The wheel drives
interior wooden gearing in the basement which in turn drives a four
foot diameter grist mill stone on the first floor of the building.
The wooden gearing is made of indigenous woods typically used 200
years ago. The design of the gears and drives were guided by the
metal hubs, bearings and shafting recovered from the mud in the
mill basement. Other components were designed and made according
to state-of-the-art practices used 200 years ago. The wooden gearing,
along with the attached shafts, are housed in a Hearst Frame made
with timbers similar to some of the frame components found in the
mill. With the exception of metal shafting and other metal components
and hardware, all the design and construction was done in-house.
Other artifacts recovered provided invaluable information as to
the size of the original mill stones, which were four foot in diameter.
It was incredibly fortunate that a matched pair were found ten miles
upriver. These could be the same stones that ground grain in 1798.
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