$2-21.$ The analysis of the refuse from a coal$-$fired furnace wlich bas been sprayed

with water is by weight

$sh=75\mathrm{.}0,$ Combustible $=15\mathrm{.}0,$ Moisture $=10\mathrm{.}0$

istume the coal a semibituminous, as in Table $1-1,$ from