2100. Why does a lamp smoke, when the wick is cut unevenly?
2101. Because the points of the jagged edge (being very easily separated from the wick) load the flame with more carbon than it can consume; and as the heat of the flame is greatly diminished by these little bits of wicks, it is unable to consume even the usual quantity of smoke. The same applies when the wick is turned up too high.
2102. Why does a lamp-glass diminish the smoke of a wick?
2103. Because it increases the supply of oxygen to the flame, by producing a draught; and it concentrates and reflects the heat of the flame; in consequence of which the combustion of the carbon is more perfect, and very little escapes unconsumed.
2104. Hints about Making Butter (See [page 287]).—Milk should never be set for butter in a dark, damp cellar—as in the case with butter-makers in this section—as the cream is thereby moulded before it has had time to rise, which gives the butter a mouldy taste.
2105. The milk is allowed to stand too long before being skimmed, which gives it a cheesy taste.