Caliber of Fire Streams—New Method of Determining Their Values

Caliber of Fire Streams—New Method of Determining Their Values

本文的较早段落主要涉及在划定和衡量火流的数量和价值方面已经获得的用法。在这方面引入的某些点似乎是那些精通液压的人。但是，此处总结的原则部分是参考的，也概述了避免不确定性的观点；此外，人们认为，那些可能没有较早的机会获得该主题所带来的特定知识的人将首选和赞赏该主题的“自我包含”介绍。如果不提及Drautic Sc​​ience通常认可的基本定律，就无法精确讨论火流的属性，但是为了追求所有提议的所有内容，就可以注意到，数学表达式被排除在外，只要这是允许使用的，拟议的比较值系统的综合说明。现在，代表着随后的声明，现在提出了这一说法，毫无疑问，他会通过开发和采用系统的发展，通过该系统，与任何有关火流有关的每个显着特征都可以给予他准确和充分的表达。不能说现在存在一种公认的或标准的方法，即到达或指定可以很好地说明“喷气式价值”。需要一个连贯和确定的方式来陈述和比较LIRE流值的连贯和确定的方式，或者他的需要始终如一地矛盾；因此，希望现在提供的论文不仅要考虑到考虑，要考虑，也不会接受。但是，这些最初的建议可能会导致相对于这个非常重要的主题实现完整和标准的法规。系统的制定及其用于指示的目的的采用。本文的作者并不坚持认为 plan herein out lined is the best that can be devised; the entire question is debatable, but, in this progressive age, let us recognize the advantages of betterments and apply them in our practice when the way to do so seems open for action.

SIZES OP FIRE Streams.—Fire departments are customarily cquippel with nozzles ranging from seven-eighths inch to 1 1/4 inches diameter. These sizes may be called "ordinary," and it probably is true that most fires are put out by streams corresponding to nozzles of these dimensions. Streams upward from 1 3/8 inches are commonly styled "large,” and when the size exceeds 2 inches they are rather exceptionable, because such streams call for devices and equipment which are not always available in every fire department. "Small" streams from tips below 1 inch diameter are not infrequently employed with good success. Under many restricted conditions, jets so small as three-quarters or fiveeighths inch are not to he condemned, but generally, and for the most effective results, especially where fires have gained headway, it is conceded that the sizes of fire streams should be not less than 1 1/8 inches or 1 1/4 inches, and as much larger than these diameters as the situation and facilities will warrant. Many fire boats are fitted to deliver streams as large as It, 1 and 5 inches, but excluding these, it may be agreed that the needs of an otherwise fully equipped department would he well met by an assortment of nozzles covering a range of sizes from liveeighths inch to 2 inches Although the bores of nozzles are frequently varied by sixteenths of an inch, the more common difference between sue cessive sizes is by "eighths." Table N'o. 1, appearing herewith, gives the areas corresponding to diameters which advance bv “eighths,” for sizes from live-eighths inch to 2½ inches, inclu-