Why does Rope Cling Together?
This is probably due to a degree of roughness in the surface of fibers, often imperceptible to the eye, yet preventing them when in close contact from slipping easily upon each other. This is greatly increased by twisting the fibers together, and is added to by the toughness of the fibers themselves, the whole giving to rope a great resisting power. In the case of wire rope it is the firmness with which the metal holds together that gives it its great resisting strength. It is also not unlikely that the pressure of gravitation takes part in rope making, by holding the fibers in close contact, even if we do not know how this force operates.
What is Rope Used for?
This is a question that has already been answered in great part. Its uses, in fact, are innumerable. It serves to hold things together, and also to hold them apart; to lift things into the air and to hold them down to the ground; to pull things forward and pull things back—but not to push things forward. For the latter something less flexible than rope is needed. Animals are tied or tethered by it and led by it, and man, himself, is one of its victims. This is especially the case in the dismal way in which man’s career upon earth has so often been ended by lifting him from the ground by the aid of a rope loop around his neck. It is of some comfort to know that this brutal use of the rope is being replaced by more humane methods of ending the lives of condemned criminals.
How did the Expression “A-1” Originate?
We have all become so accustomed to hearing the term “A-1” used to designate a thing as perfect that it does not occur to many of us to wonder how it originally came to be used in that connection. Its first use was as a symbol in the code by which vessels were graded in the register of shipping kept by Lloyd’s, the originators of marine insurance. “A-1” was the best rating given to the highest class vessels, “A” standing for perfect condition of the hull of the ship and “1” meaning that the rigging and whole equipment was complete and in good order.
How has Man Helped Nature Give Us Apples?
The original of all the varieties of the cultivated apple is the wild crab, which is a small and extremely sour fruit, and is native of most of the countries of Europe. We use the crab-apple for preserving even now, although man’s ingenuity has succeeded in inducing nature to give us many better tasting kinds.
The amazingly large number of different varieties which we have today have all been brought into existence through the discovery of the process of “grafting.” There are a half a dozen or more different methods of grafting. The method most commonly practiced in working with apple trees is called “bud-grafting,” and consists of transferring a plate of bark, with one or more buds attached, from one tree to another.