. Die amerikanische Zeitschrift für Roentgoenology, Radium-Therapie und Nuklearmedizin . Wenn das Tier nach der Staubbelastung beiseite gelegt wird, unternimmt die Lunge schnelle und effektive Anstrengungen, um sich von dem Reizstoff zu befreien. Der Abklärungsprozess wurde nur bis zu drei Monate bei Tieren beobachtet, die bereits seit sieben Monaten bestäubt wurden, aber zu diesem Zeitpunkt wird praktisch der gesamte Staub in großen Aggregationen von runden oder ovalen Mononuklearzellen gesammelt, die in unmittelbarer Nähe von stark vergrößerten Lymphknoten liegen. Schwere De-Posits treten innerhalb solcher Knötchen und innerhalb der tracheo-bronchialen Lymphknoten auf. Cotuposition von Barrc Gr
1427 x 1752 px | 24,2 x 29,7 cm | 9,5 x 11,7 inches | 150dpi
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. The American journal of roentgenology, radium therapy and nuclear medicine . If the animal be set aside after dustexposure the lung makes rapid and effectiveeffort to rid itself of the irritant. The clear-ing process has only been observed up tothree months in animals dusted for sevenmonths previously, but at that time practic-ally all the dust is collected within largeaggregations of round or oval mononuclearcells which lie in the immediate vicinity ofmuch enlarged lymph nodules. Heavy de-posits occur within such nodules and withinthe tracheo-bronchial lymph nodes. Cotuposition of Barrc Granite: Silicon Dioxide 69.56 Aluminum Oxide 15-38 Iron Oxide 2.65 Magnesia Oxide Trace Calcium Oxide 1.76 Sodium Oxide 5.38 Potassium Oxide 4.31 Manganese Trace Loss on ignition, CO2 and moisture 1.02 100.06According to (iardner* when examinedunder the microscope the unscreened dustmay be roughly divided into large and smallparticles. The former, which could not possi-blv be concerned in an inhalation experiment, Roentgen Study of Dust Inhalation in the Granite Industry 247. Fig. 4 (227). Exposure thirty-three years. Working every day. Granite fibroid pneumoconiosis stageC. Only symptoms slight cough, slight expectoration. Physical examination negative. 248 Roentgen Study of Dust Inhalation in the Granite Industry show an average size of 82 bv 84 microns(ocular micrometer measurement). Thesmaller particles average 4.3 by 6.3 micronswith a minimum of .028 by 1.4 microns byactual measurement. In shape the particlesmay vary greatly. Some are flattened poly-gonal masses with sharply cut edges and cor-ners. Others are rod-^ehaped, often slightlycurved, with sharply horizontal or square cutends. Frequent vegetable cells and fibers arenoted. Samples of dust resulting from the useof the pneumatic tool have been examinedby means of a small giant magnet made bythe Victor .Y-Ray Corporation, and consid-erable steel has been extracted from a givenquantity by means of the magnet, 2 drams ofg
