Show valuable Vilu able glass when la Is glass worth more than gold when it Is the ense of a micro scope the record increase in va ue of the n manufactured article over the raw material I 1 probably made by this v nety of glass h multiplies itself 50 times the front lens of a micro objective costing about 5 weighs no more than about of a gramme hence the value of such lenses to the weight of a kilogramme kilo gramme would be about 3 the cost of mak ing this weight of glass Is three to six cents and thus when worked up into the shape of a lens the glass has in creased in value about 50 goo times |