Inner-tubes are the inflatable parts between the tire and the metal parts of the wheel. They are invisible apart from their valves that protrude through the wheel-rims. There are three valve types in use; Schrader valves, Presta valves, and the lesser used Dunlop valves. Refer to the adjacent image for examples.
The word papyrus /pÉËpaÉªrÉs/ refers to a thick paper-like material made from the pith of the papyrus plant, Cyperus papyrus. Papyrus can also refer to a document written on sheets of papyrus joined together side by side and rolled up into a scroll, an early form of a book.The plural for such documents is papyri.apyrus is made from the stem of the papyrus plant, Cyperus papyrus. The outer rind is first removed, and the sticky fibrous inner pith is cut lengthwise into thin strips of about 40 cm (16 in) long.
Papyrus plant is a sedge which grew mainly along the Nile river and it had great importance in the ancient Egyptian culture. Egyptians used papyrus mainly for making paper and also for making boats, mattresses, mats, rope, sandals, and baskets.The papyrus rhizomes were used in food and the stems were used for fuel.apyrus as a writing material. Papyrus was widely used as a writing material, especially in Egypt.The stems of the plant have white pith inside which was used to make paper. Papyrus had been processed to make sheets and the sheets were stuck together to make a roll.