Show ARCHEOLOGISTS USE AIR T TO DUST FINDS I Archeologists have discovered a anew anew new use for compre compressed ed air The They use it when working at ancient In Indian Indian Indian In- In dian sites to blow the dust of centuries centuries cen cen- tunes from line fine delicate specimens specimen such as fur robes burned matting mattin or badly disintegrated wood or bone bon bone The apparatus which has been sue sue- suc-i suc used by the Van Bergen I Los Angeles museum expedition ii In its work at caves and old village sites is simple It consists of ot a a. sma small portable air tank ordinarily used in spraying praying vineyards and orchards Th The Thel tank has a trigger-controlled trigger nozzlE through which air Instead of th the thel spraying compound is directed upon archeological material too delicate to stand the touch of ot hands or even a afine anne fine camelhair brush In deposits such as debris of or th the theold theold old basket maker Indians in which perishable materials are found th thair the theair theair air tank and hose with its readily controlled nozzle are most useful Often the fine dust of ot the centuries which has settled upon the artifacts left by these there people who died some som 1500 to 2000 years ears ago is soft an and fluffy as ashes Trenching Is cliff cliff- cult Even such tools as the ever ever- present and easily wielded trowel th the main digging tool of ot every wel well well- trained archeologist proves too hea heavy vy When such difficulties are met th thair the theair theair air gun is brought into play Steady Stead gentle air all currents are directed at th the layers of dust chaff light straw anc and debris whisking them to one side sid quickly and evenly leaving the specimen spec spec- men or specimens bare ready fo for photographing and if necessary treatment for future preservation |