Show screws small as dost the smallest screws in the world are made in a watch factory there can be no doubting that assertion on any score they arc cut from steel wire by a machine but as the chips fall down from the knife it looks as if the operation was simply cutting ap the wire for ann one thing is certain no screws can be seen and yea is made every third operation the fourth jewel wheel screw is the nest thing to being invisible and to the naked eye it look like dust with a itis seen to be a small screw with threads to the inch and with a very fine glass the threads may be seen very clearly these little screws are 4 of an inch in diameter and the heads are double in size it is estimated that an ordinary ladys thimble would hold of these tiny little screws about of them are made a month but no attempt is ever mado to count them in determining the number of them are placed on a very delicate balance and the number of the whole amount is determined by the weight of this all of the small parts of the watch are counted in this way probably fifty out of after being cut the screws are hardened and put in frames about to the tram heads up this is done very rapidly but entirely by sense of touch instead of sight so that a blind man could do just as well as tho owner of tho sharpest eyes the heads are then polished in an automatic machine at a time the plate on which they are polished is covered with oil and a grinding compound and on this the machine moves them very rapidly by a reversing motion until they are biilly and perfectly polished |