6′ 0¾″ diam., 18 oval spokes, rectangular inner rim, apparent tread 4″, tyre width 145 mm.
Hub 14½″ face dia., 15 mm out from the tyre, pin between spokes. Note that the coupling rods have one inch less throw than the connecting rods: the driven wheel pin is off-set at half way, driven wheel pin inner half at 12″, outer half at 13″, coupled wheels pins all at 12″.
Sources: works drawing, photographs.
Castings: 41.1 mm tread dia., 36.6 i/d, hub 0.3 mm out from the tyre, pin at 6.9 mm.
9 Sept 2017