| Show about alloy alloys the word alloy la is employed in chem chern astry to fe the combination of one metal with one or more others for in stance brass Is an alloy of 0 copper and zinc bronze Is an alloy of copper and tin german silver Is an alloy of copper zinc line and nickel pewter Is an alloy of lead and tin etc these alloys have given a great deal of difficulty to scientific chemists and even ev en now it Is not certain whether they the are definite chemical compounds or mere mixtures in some ca cases es indeed they appear to be fixed compounds that is always presenting the same composition or containing the same weight of each of the metals and some can be obtained in the form of cry atals which invariably present the same composition but when we come to con alder the alloys of copper and zinc as its well as those of copper and tin we flud that there exist a considerable number of them containing variable amounts of each metal and differing iery very widely in their properties for instance an alloy of forty parts of zinc with sixty parts of copper represents a kind of brass which will very well serve certain purposes in the arts such as the sheathing of ships but it will not answer tor for other purposes which require a brasa brass containing say twenty eight parts of zinc and se seventy enty two parts of copper cham bers journal |
