Show peni pent llie nta la sand mine there are all kinds of mines in penn sylvania the greatest are of course the iron and coal mines but few people would guess that the next extensive mining industry is the sand mines in western pennsyl ania these mines aro rarely underground how hove ever and many of them are vien viewed ed with wonder by passengers on the pennsylvania ap ing arg whole mountains are being dug away and the granular rocks for forming miraZ them are being reduced to sand for the manufacture of glass in and about pittsburg philadelphia call lorne iome of the machines anachi s for making mat matches clies which are us ns d in these days make revolutions in a minute and t turn urn out about 2 00 OUO matches daily oi 01 acx ut 00 annually |