Pulp and paper magazine of Canada . main-tained at the desired rate or density ofoutput. Their delivery is continuous,and the operation of the entire batteryis in plain view, unobstructed by topgear or overhead connections. No other class of make of pulp millmachinery affords the operative or thesuperintendent such a chance to keephis work up to the standard withoutwaste of time, power or stock. Magazine of Canada. i6i MOISTURE TESTING OF SULPHITE PULP. By T. L. CROSSLEY. In articles dealing- with this importantquestion of mill routine and market re-lations, commercial practicabilitj^ hasbeen
Pulp and paper magazine of Canada . main-tained at the desired rate or density ofoutput. Their delivery is continuous,and the operation of the entire batteryis in plain view, unobstructed by topgear or overhead connections. No other class of make of pulp millmachinery affords the operative or thesuperintendent such a chance to keephis work up to the standard withoutwaste of time, power or stock. Magazine of Canada. i6i MOISTURE TESTING OF SULPHITE PULP. By T. L. CROSSLEY. In articles dealing- with this importantquestion of mill routine and market re-lations, commercial practicabilitj^ hasbeen sacrificed to mathematical accur-acy. The pulps with w^hich Americanchemists have to deal vary so widely inmoisture content and form of package,that the study of moisture distributionin one form of package gives no dataapplicable to other forms. Breaking bales or rolls and cuttingwedges or strips from several parts ofthe bale is a quite impracticable pro-cedure for routine testing in a large millfrom the standpoint of both time and. space. It is difficult if not out of thequestion to hold a carload of pulp pend-ing test. The sheets vary greatly in thicknessand moisture. A thin dry sheet weighsmuch less per square foot than thethick wet sheet so often alternating withit under mill conditions. With the widerange of mdisture content mentioned,accuracy in sampling can only be ap-proached by taking the average of manysamples. One bale in ten is insuf-ficient for a 60,000 lb. car of 250 , but quite sufficient for a lot often cars. The variation in moisturefor a car of machine dried sulphite willoften be as much as 25%, sometimes even 30%. It can readily be seen thatsamples accurately representing twenty-five individual bales in a lot of 250 witha variation of 25% may not be repre-sentative of the total content of the more expeditious, even if less accur-ate, sampling of twice as many balesmay come nearer the correct figure forthe whole car. The chemist at a paper mill b
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