. Il laboratorio dei prodotti forestali; . lvedenel tlie osservazione di certe precauzioni nel processo resultedin ridurre al minimo il sanguinamento sgradevole comune fino a quel tempo. Nel disegno delle specifiche adottate dalla AmericanWood Preservers Association e dalla American Society for jNIunici-pal Improvements, per il trattamento e la posa di pavimenti in legno di lecca, il laboratorio ha svolto un ruolo di primo piano. La conoscenza della tossicità e del valore conservante dei diversi tipi di conservanti, sia proprietari che di altro tipo, è fondamentale, in modo che i buoni possano esserne
1192 x 2095 px | 20,2 x 35,5 cm | 7,9 x 14 inches | 150dpi
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. The Forest products laboratory; . lvedhereby tlie observation of certain precautions in the process resultedin reducing to a minimum the objectionable bleeding common up tothat time. In the drawing of specifications adopted by the AmericanWood Preservers Association and the American Society for jNIunici-pal Improvements, for the treatment and laying of wood lilocks inpavements, the laboratory played a prominent part. Knowledge of the toxicity and preservative value of differentkinds of preservatives, both proprietary and otherwise, is fundament-ally necessary, so that the good ones may be developed and the pooreliminated. The laboratory has made tests on and analyzed practi-cally all the important preservatives which have been on the marketsince its inception. Fundamental information concerning the relative ease of treat-ment with preservatives has been obtained for all of the woods ordi-narily treated in this country. An important commercial applicationof this information hes in the grouping of woods for treatment.. A Decexxial Record 31 A subject of tremendous importance, upon which comparativelylittle work has been done so far is the fireproofing of wood throughpainting or the injection of chemicals. The laboratory has developedapparatus for the measurement of the inflammability of either naturalor fireproofed wood and has studied the relative inflammability ofuntreated wood of manj^ species and of specimens treated with vari-ous kinds of fireproofing agents. The relative value of severalmethods of fireproofing has been studied and a fireproofing paint de-veloped. The final test of any wood-preserving process or material lies inthe results which it yields in actual service; no laboratory test cansimulate the widely varying conditions encountered in use with suf-ficient accuracy. Therefore, a large number of experimental tests oftreated timber have been placed throughout the country, principallyin cooperation with large consumers of timber. There are tests oft
