Show to manufacture optical glass the manufacture of american optical glass la Is about to be inaugurated on a commercial basla basis a largo large factory having been erected by an optical firm of rochester N Y willell which it Is said will be equipped to make all kinds of jensen from the tiny glass us used 0 1 I I 1 in 0 v tile microscope to that of the search light measuring searal feet in diameter the first effort in this direction was made mada about twenty five years ago and the effort was a failure unit anil wag wa 3 abandoned the latest effort in thu the manufacture of this glass was begun experimentally by the rochester no chester firm a few years yeara ago and when the war broke out title this had just demonstrated KB its success Buc cess so that its expansion would have bave come along in the regular order of ct things but the necessity for a plant of this kind in fit this country line lias forcibly demonstrated by the war which has completely cut oft the supply of optical glass which came here tolore from one or the other of af the belligerent countries |