The Wonder Book of Knowledge: The Marvels of Modern Industry and Invention, the Interesting Stories of Common Things, the Mysterious Processes of Nature Simply Explained
History
The Wonder Book of Knowledge: The Marvels of Modern Industry and Invention, the Interesting Stories of Common Things, the Mysterious Processes of Nature Simply Explained
Industrial arts -- History
The particular type of range herewith illustrated (Fig. 21) uses a
burner of the open-coil type, both for the surface burners and for the
oven. The ovens are highly insulated with a thick packing of best grade
mineral wool, which reduces air leakage to a minimum and retains the
heat generated for a long period. Many cooking operations which are
performed in ordinary ovens with the burners on, can be prepared in this
particular style of oven by using stored heat for the last half of the
operation. The range is simplicity itself in operation. Each burner is
operated by an indicating snap switch which has three separate heats,
full, medium and low; medium being one-half of full and low one-half of
medium. There are no matches; there is no danger from fire. There is no
vitiated, foul air because of noxious gases from ordinary cooking
stoves. There is no soot or grime, no ashes, no wood or coal to carry;
there are fewer steps; there is less watching of the range; practically
none at all, because when a burner is turned to medium, for instance,
you know that you have a certain degree of heat for just as long as the
switch is in that position. Results are eminently satisfactory and there
is a sufficient saving in the weights and the nutritive value of foods
cooked, especially in the oven, to make the electric range indeed a most
desirable and economical addition to any home.
Today, the housewife, whether the provider of the home be a laborer or a
merchant prince, can, with a simple touch of the button or a snap of the
switch, bring to her immediate command, and subservient to her wishes,
that subtle something which came in the snowflake, and which, while
invisible, yet provides the greatest boon to mankind--electricity.
* * * * *
Why is there Always a Soft Spot in a Cocoanut Shell?
A cocoanut shell always has a soft spot at one end because this is the
provision nature has made to allow the embryo of the future tree to push
its way out of the hard shell.
Cocoanuts, as most of us know, have a thick, hard shell, with three
black scars at one end. The soft scar may easily be pierced with a pin;
the others are as hard as the rest of the shell. Outside of this hard
shell we are accustomed to seeing another covering of considerable
thickness, of an extremely fibrous substance. When cocoanuts are picked,
however, they have still another covering-an outer rind which has a
smooth surface.
The tree which produces the cocoanut is a palm, from sixty to a hundred
feet high. The trunk is straight and naked, and surmounted by a crown of
feather-like leaves. The nuts hang from the summit of the tree in
clusters of a dozen or more together.
Public-domain text, read in full here on John Shaqi.
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