gine (from plate 7 in Withington's translation of the Marestier
report). The graphic dimensions do not precisely correspond to the
scale of dimensions in Marestier's text, nor with other recorded
measurements.]

Marestier's drawings of the engine and paddle wheels[8] are reproduced
in figure 4. The nonoscillating engine is inclined toward the
paddle-wheel shaft. The connecting rod operates a crosshead to which
is pivoted a pitman, or oscillating rod, that operates the
paddle-wheel crankshaft. Alongside the steam cylinder is an air pump
cylinder, also connected to the crosshead. The steam inlet and outlet
pipes enter a valve chest on top of the steam cylinder, which is
described as being 1.035 meters (3.4 feet) in diameter, and of 1.5
meters (4.9 feet) in stroke.

The paddle wheels are shown as being of iron, with two fixed arms
opposite one another on the hub. The other arms (four above and four
below the fixed arms) are pivoted to the hub and held spread by chain
stays. These eight blades fold, in pairs, to each of the fixed arms.
The wheels are shown in elevation, with the upper pivoted arms folded
on top of the fixed arms, and in cross section; the latter shows the
shape of the buckets, hub, and outboard bearing of the shaft. The
wheels are described as being 4.9 meters (16 feet) in diameter, while
the buckets are 1.42 meters (4.65 feet) wide and 0.83 meters (2.72
feet) deep. The two outer corners of each bucket are snyed off at
nearly 45 deg. The wheels are shown folded in the sketch; according to
the description, they could be unshipped from the shaft and stowed on
deck when desired. The method of removing the wheels from the shaft is
not described, but from the drawings it seems probable that they were
detached from the shaft by removing a lock bolt outboard and sliding
the wheels off the square shaft. The hub seems adequate for this.
Marestier states that this removal could be accomplished in 15 to 20
minutes; the logbook shows that it took 20 to 30 minutes to perform
this operation at sea.

Marestier states that the ship had spencer masts and trysails on fore
and main, and a spencer mast on the mizzen for a spanker; he
illustrates these as having royal poles, but with no royal yards
crossed.[9] The smokestack is described as pivoted. The mainstay is
double, setting up at deck, near rail, and forward of the foremost
shrouds of the foremast to clear the stack and foremast.

The boilers were in the hold, but M