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 pins are put into a vibrating hopper, which slopes slightly towards
the sticking machine. The conductor from the hopper to the machine is
made of two strips of steel, down which the pins, held by their heads,
slide. They are taken from the conductor by a screw thread and fed to
the carrier, which takes thirty pins at a time and places them in front
of a set of thirty punches. They are then forced along thirty grooves in
the steel clamps, which crimp the paper, and on through the crimp. Thus
a whole row of pins is stuck at once. The paper is now advanced the
proper distance, and another row is stuck. When the center of the paper
is reached, after six rows have been stuck, the machine automatically
spaces the paper so as to skip the space used for the brand name. Then
six more rows are stuck, and the operator removes the completed paper
and inserts another without stopping the machine. These papers are
inspected to make certain that no poorly made pins have gotten by the
former inspection, are rolled and packed, usually in boxes of twelve
papers each.
Pins today are made in many sizes from the 3-1/2-inch stout blanket pins
down to the fine, slender, bronze pins used by entomologists, 4,500 of
which pins make an ounce. Toilet pins are usually made in six sizes as
shown in the illustrations. Besides the common or toilet pins, there are
today numerous special bank and desk pins which are made to meet special
requirements.
Pin production in the United States has reached a high stage of
development. The number of pins made in 1914 reached the tremendous
total of 25,000,000,000. These figures are almost too great for
comprehension. If all the pin wire used for these 25,000,000,000 pins
were in one piece it would go around the earth fifteen times. Safety
pins, hooks and eyes, and hairpins, are generally made by pin concerns.
Each of these different articles require very ingenious machines. Many
of them are almost human in their operation.
* * * * *
The popular name of the prominence seen in the front of the throat in a
man is called the “Adam’s apple” because of the story in the Old
Testament, telling of the eating of the forbidden fruit of the tree of
knowledge by Adam, a piece being supposed to have lodged in his throat
where the bulge appears.
[Illustration: AN ALPINE GLACIER]
[Illustration: THE MER DE GLACE
The upper view shows the method of crossing a glacier. Each of the
climbers is carrying an alpenstock, or staff with ice ax at one end and
spike at the other. The lower view is the famous sea of ice in
Switzerland.]
[Illustration: MOUNT RAINIER, WASHINGTON
One of the largest glacial systems in the world radiating from a single
peak is situated on this mountain in western Washington.]
How are Glaciers Formed?
Public-domain text, read in full here on John Shaqi.
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