Pratt Institute

1892 Scientific American  
probably be found to yield the highest of all. The' substantially I1niform whatever process is employed. photographs, plates, and designs. Indeed, a careful development in recent tImes of many systems of treat-That is to say, a certain sort of wood will yield the observer might gain a not unimportant idea of the ing fibrous plants has led to hesitation on the part of same quantity of pulp whether it is prepared with history and development of the various fine arts from manufacturers as to the
more » ... lection of any special system bisulphite of lime or magnesia. These solutions have the hundreds of photographs chronologically arranged of treatment. Raw fibers of the type of esparto and p!'actically no solvent action on cellulose, and in virtue in the halls, stairways, and rooms of the entire build straw can only be advantageously treated, so far as of this, the highest possible amount of fiber is obtained ing. In whatever direction he turns there is always present experience goes, by one procesBj namely, the from unit weight of wood. some object of artistic interest to please the eye. The soda process. With wood, however, it is different, be- The difficulty in arriving at comparable figures prob-practical application of art is everywhere studied, and cause we have three distinct methods of chemi�al treat-ably lies in the direction of the nature of the wood it-as the study of form enters so largely into thE' theory ment, known respectively as the causti<-" SUlphate, and self, whether it is old or young, and also in the nature of manual and industrial trainin � , the pupils in nearly bisulphite processes. These processes ar employed on of the climate where it is grown. In addition to this, every department are, at one tIme or another in the an enormous scale in Europe and America, and yield the fact that the wood requires more careful preparation course, to be found in the art rooms, and notable speci different quantities of paper pulp from the same kind for the sulphite processes, if a high class pulp is requir-mens of their handiwork are of especial interest to of wood, as well as fibers differing from one another in ed, accounts, it may be, for a variation in the different visitors. quality and paper-making properties. statements regarding the yield. The extra cleaning The normal art course is constantlr increasing in Although the yield of pulp from white pine in the and waste, together with the rejection in some case of value, and the clas!!es are correspondmgly large; A soda or sulphate process is subject to fluctuation with certain parts of the timber, probably affects the returns. glance at the. work pUr!lued here is certain to be of in the different conditions under which the wood is digest-In high class pulp mills the wood is subjected to a most tereilt ttl !!tudents and teachers; in addition to the ed, yet, broadly speaking, there is a uniformity notice-exhaustive system of selection and cleaning, the. diffel'� , work of , the first year in the regular art course, includ able among the results obtained in factories where ent qualities being worked up by tllemseiVes\ Yieldiii� tng sketching, lectures on perspective, composition, -either of these processes is at work-the yield obtained special brands of first, second, third, and even fOlirth harmony of color, historic ornament and design, the
doi:10.1038/scientificamerican12241892-14160supp fatcat:afae77d45ngaxegbt34zj7y6sy