CHAPTER XVI. MACHINERY OF APPLICATION.

The term application has been selected as a proper one to distinguish machines that expend¹ and apply power, from those that are employed in generating or transmitting power. Machines of application employed in manufacturing, and which expend their action on material, are directed to certain operations which are usually spoken of as processes, such as cutting, compressing, grinding, separating, and disintegrating².

By classifying these processes, it will be seen that there is in all but a few functions to be performed by machines, and that they all act upon a few general principles. Engineering tools employed in fitting are, for example, all directed to the process of cutting. Planing machines, lathes³, drilling machines, and shaping machines are all cutting machines, acting⁴ upon the same general plan—that of a cleaving⁵ wedge propelled in straight or curved lines.

Cutting, as a process in converting material, includes the force to propel cutting edges, means to guide and control their action, and mechanism⁶ to sustain and adjust the material acted upon. In cutting with hand tools, the operator performs the two functions of propelling and guiding the tools with his hands; but in what [58] is called power operations, machines are made to perform these functions. In nearly all processes machines have supplanted⁸ hand labour, and it may be noticed in the history and development of machine tools that much has been lost in too closely imitating hand operations when machines were first applied⁹. To be profitable, machines must either employ more force, guide tools with more accuracy, or move them at greater speed, than is attainable¹¹ by hand. Increased speed may, although more seldom, be an object in the employment of machinery¹², as well as the guidance of implements¹³ or increased force in propelling them. The hands of workmen are not only limited as to the power that may be exerted, and unable to guide tools with accuracy, but are also limited to a slow rate of movement, so that machines can be employed with great advantage in many operations where neither the force nor guidance of tools are wanting.

There is nothing more interesting, or at the same time more useful, in the study of mechanics, than to analyse the action of cutting machines or other machinery of application, and to ascertain¹⁴ in examples that come under notice whether the main object of a machine is increased force, more accurate guidance, or greater speed than is attainable by hand operations. Cutting machines as explained may be directed to either of these objects singly, or to all of them together, or these objects may vary in their relative importance in different operations; but in all cases where machines are profitably employed, their action can be traced to one or more of the functions named.

To follow this matter further. It will be found in such machines as are directed mainly to augmenting¹⁶ force or increasing the amount of power that may be applied in any operation, such as sawing wood or stone, the effect produced when compared to hand labour is nearly as the difference in the amount of power applied; and the saving that such machines effect is generally in the same proportion. A machine that can expend ten horse-power in performing a certain kind of work, will save ten times as much as a machine directed to the same purpose expending¹⁷ but one horse-power; this of course applies to machines for the performance of the coarser kinds of work, and employed to supplant⁷ mere¹⁸ physical effort. In other machines of application, such as are directed mainly to guidance, or speed of action, such as sewing machines, dove-tailing machines, gear-cutting machines, and so on, there is no relation whatever between the increased [59] effect that may be produced and the amount of power expended¹⁹.

The difference between hand and machine operations, and the labour-saving effect of machines, will be farther spoken of in another place; the subject is alluded²⁰ to here, only to enable the reader to more fully²¹ distinguish between machinery of transmission and machinery of application. Machinery of application, directed to what has been termed compression processes, such as steam hammers, drops, presses, rolling mills, and so on, act upon material that is naturally soft and ductile²², or when it is softened²³ by heat, as in the case of forging.

In compression processes no material is cut away as in cutting or grinding, the mass being forced into shape by dies or forms that give the required configuration²⁴. The action of compressing machines may be either intermittent²⁵, as in the case of rolling mills; percussive²⁶, as in steam hammers, where a great force acts throughout a limited distance; or gradual and sustained, as in press forging. Machines of application, for abrading²⁷ or grinding, are constantly coming more into use; their main purpose being to cut or shape material too hard to be acted upon by compression or by cutting processes. It follows that the necessity for machines of this kind is in proportion to the amount of hard material which enters into manufactures; in metal work the employment of hardened steel and iron is rapidly increasing, and as a result, grinding machines have now a place among the standard machine tools of a fitting shop.

Grinding, no doubt, if traced to the principles that lie at the bottom, is nothing more than a cutting process, in which the edges employed are harder than any material that can be made into cutters, the edges firmly supported by being imbedded into a mass as the particles of sand are in grindstones, or the particles of emery in emery wheels.

Separating machines, such as bolts and screens, which may be called a class, require no explanation. The employment of magnetic machines to separate iron and brass²⁸ filings or shop waste, may be noted²⁹ as a recent improvement of some importance.

Disintegrating machines, such as are employed for pulverising various substances, grinding grain or pulp³⁰, separating fibrous material, and so on, are, with some exceptions, simple enough to be readily understood. One of these exceptions is the rotary³¹ "disintegrators," recently introduced, about the action of which some diversity of opinion exists. The effect produced is certainly [60] abrasive³² wear, the result of the pieces or particles striking one against another, or against the revolving³³ beaters and casing. The novelty of the process is in the augmented³⁴ effect produced by a high velocity³⁵, or, in other words, the rapidity of the blows.

(1.) Name five machines as types of those employed in the general processes of converting material.—(2.) Name some machines, the object of which is to augment¹⁵ force—One to attain¹⁰ speed—One directed to the guidance of tools.—(3.) What is the difference between the hot and cold treatment of iron as to processes—As to dimensions?— (4.)

1 expend   

vt.花费，消费，消耗

参考例句：

• Don't expend all your time on such a useless job.不要把时间消耗在这种无用的工作上。
• They expend all their strength in trying to climb out.他们费尽全力想爬出来。

2 disintegrating   

v.（使）破裂[分裂，粉碎]，（使）崩溃( disintegrate的现在分词 )

参考例句：

• As a poetic version of a disintegrating world, this one pleased him. 作为世界崩溃论在文学上的表现，他非常喜欢这个学说。 来自辞典例句
• Soil animals increase the speed of litter breakdown by disintegrating tissue. 土壤动物通过分解组织，加速落叶层降解的速度。 来自辞典例句

3 lathes   

车床( lathe的名词复数 )

参考例句：

• They showed keen interest in the various lathes on exhibition. 他们对展出中的各类车床表现出了浓厚的兴趣。
• To automate the control process of the lathes has become very easy today. 使机床的控制过程自动化现已变得很容易了。

4 acting   

n.演戏，行为，假装；adj.代理的，临时的，演出用的

参考例句：

• Ignore her,she's just acting.别理她，她只是假装的。
• During the seventies,her acting career was in eclipse.在七十年代，她的表演生涯黯然失色。

5 cleaving   

v.劈开，剁开，割开( cleave的现在分词 )

参考例句：

• The freighter carrying pig iron is cleaving through the water. 装着生铁的货船正在破浪前进。 来自辞典例句
• IL-10-cDNA fragment was obtained through cleaving pUC-T-IL-10cDNA by reconstriction enzymes. 结果：pcDNA3.1-IL-10酶切鉴定的电泳结果显示，pcDNA3.1-IL-10质粒有一个560bp左右的插入片断，大小和IL-10cDNA大致符合。 来自互联网

6 mechanism   

n.机械装置；机构，结构

参考例句：

• The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
• The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。

7 supplant   

vt.排挤；取代

参考例句：

• Electric cars may one day supplant petrol-driven ones.也许有一天电动车会取代汽油驱动的车。
• The law of momentum conservation could supplant Newton's third law.动量守恒定律可以取代牛顿第三定律。

8 supplanted   

把…排挤掉，取代( supplant的过去式和过去分词 )

参考例句：

• In most offices, the typewriter has now been supplanted by the computer. 当今许多办公室里，打字机已被电脑取代。
• The prime minister was supplanted by his rival. 首相被他的政敌赶下台了。

9 applied   

adj.应用的；v.应用，适用

参考例句：

• She plans to take a course in applied linguistics.她打算学习应用语言学课程。
• This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。

10 attain   

vt.达到，获得，完成

参考例句：

• I used the scientific method to attain this end. 我用科学的方法来达到这一目的。
• His painstaking to attain his goal in life is praiseworthy. 他为实现人生目标所下的苦功是值得称赞的。

11 attainable   

a.可达到的，可获得的

参考例句：

• They set the limits of performance attainable. 它们确定着可达到的运行限度。
• If objectives are to be meaningful to people, they must be clear, attainable, actionable, and verifiable. 如果目标对人们是具有意义的，则目标必须是清晰的，能达到的，可以行动的，以及可供检验的。

12 machinery   

n.(总称)机械，机器；机构

参考例句：

• Has the machinery been put up ready for the broadcast?广播器材安装完毕了吗？
• Machinery ought to be well maintained all the time.机器应该随时注意维护。

13 implements   

n.工具( implement的名词复数 )；家具；手段；[法律]履行（契约等）v.实现( implement的第三人称单数 )；执行；贯彻；使生效

参考例句：

• Primitive man hunted wild animals with crude stone implements. 原始社会的人用粗糙的石器猎取野兽。 来自《现代汉英综合大词典》
• They ordered quantities of farm implements. 他们订购了大量农具。 来自《现代汉英综合大词典》

14 ascertain   

vt.发现，确定，查明，弄清

参考例句：

• It's difficult to ascertain the coal deposits.煤储量很难探明。
• We must ascertain the responsibility in light of different situtations.我们必须根据不同情况判定责任。

15 augment   

vt.(使)增大，增加，增长，扩张

参考例句：

• They hit upon another idea to augment their income.他们又想出一个增加收入的办法。
• The government's first concern was to augment the army and auxiliary forces.政府首先关心的是增强军队和辅助的力量。

16 augmenting   

使扩张

参考例句：

• My business was now constantly augmenting, and my circumstances growing daily easier. 现在，我的业务不断扩大，我的境况日益安逸。
• I spent a penitential weekend augmenting the green acceptable. 我临时唯有利用周末在每顶绿帽子上加一点红色上去，以免男性来宾不肯戴上。

17 expending   

v.花费( expend的现在分词 )；使用（钱等）做某事；用光；耗尽

参考例句：

• The heart pumps by expending and contracting of muscle. 心脏通过收缩肌肉抽取和放出（血液）。 来自互联网
• Criminal action is an action of expending cost and then producing profit. 刑事诉讼是一种需要支付成本、能够产生收益的活动。 来自互联网

18 mere   

adj.纯粹的；仅仅，只不过

参考例句：

• That is a mere repetition of what you said before.那不过是重复了你以前讲的话。
• It's a mere waste of time waiting any longer.再等下去纯粹是浪费时间。

19 expended   

v.花费( expend的过去式和过去分词 )；使用（钱等）做某事；用光；耗尽

参考例句：

• She expended all her efforts on the care of home and children. 她把所有精力都花在料理家务和照顾孩子上。
• The enemy had expended all their ammunition. 敌人已耗尽所有的弹药。 来自《简明英汉词典》

20 alluded   

提及，暗指( allude的过去式和过去分词 )

参考例句：

• In your remarks you alluded to a certain sinister design. 在你的谈话中，你提到了某个阴谋。
• She also alluded to her rival's past marital troubles. 她还影射了对手过去的婚姻问题。

21 fully   

adv.完全地，全部地，彻底地；充分地

参考例句：

• The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气，然后全部呼出。
• They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。

22 ductile   

adj.易延展的，柔软的

参考例句：

• Steel in this class is tough，ductile and easily machined.这种钢强韧，延展性好，而且容易加工。
• The metal is very hard and strong and less ductile than before.金属会非常坚硬、坚固，并比以前减少了韧性。

23 softened   

（使）变软( soften的过去式和过去分词 )； 缓解打击； 缓和； 安慰

参考例句：

• His smile softened slightly. 他的微笑稍柔和了些。
• The ice cream softened and began to melt. 冰淇淋开始变软并开始融化。

24 configuration   

n.结构，布局，形态，(计算机)配置

参考例句：

• Geographers study the configuration of the mountains.地理学家研究山脉的地形轮廓。
• Prices range from $119 to $199,depending on the particular configuration.价格因具体配置而异，从119美元至199美元不等。

25 intermittent   

adj.间歇的，断断续续的

参考例句：

• Did you hear the intermittent sound outside?你听见外面时断时续的声音了吗？
• In the daytime intermittent rains freshened all the earth.白天里，时断时续地下着雨，使整个大地都生气勃勃了。

26 percussive   

adj.敲击的

参考例句：

• When it is dragged over pliant areas, an additional percussive tap could indicate this collision. 当它被拖到受范区域时，一个附加的敲击声提示这种碰触。 来自About Face 3交互设计精髓
• Pneumatic DTH (Down-The-Hole) hammer is one of main pneumatic percussive-rotary drilling equipments. 风动冲击器是气动冲击回转钻进的主要设备之一。 来自互联网

27 abrading   

v.刮擦( abrade的现在分词 )；（在精神方面）折磨（人）；消磨（意志、精神等）；使精疲力尽

参考例句：

28 brass   

n.黄铜；黄铜器，铜管乐器

参考例句：

• Many of the workers play in the factory's brass band.许多工人都在工厂铜管乐队中演奏。
• Brass is formed by the fusion of copper and zinc.黄铜是通过铜和锌的熔合而成的。

29 noted   

adj.著名的，知名的

参考例句：

• The local hotel is noted for its good table.当地的那家酒店以餐食精美而著称。
• Jim is noted for arriving late for work.吉姆上班迟到出了名。

30 pulp   

n.果肉，纸浆；v.化成纸浆，除去...果肉，制成纸浆

参考例句：

• The pulp of this watermelon is too spongy.这西瓜瓤儿太肉了。
• The company manufactures pulp and paper products.这个公司制造纸浆和纸产品。

31 rotary   

adj.(运动等)旋转的；轮转的；转动的

参考例句：

• The central unit is a rotary drum.核心设备是一个旋转的滚筒。
• A rotary table helps to optimize the beam incidence angle.一张旋转的桌子有助于将光线影响之方式角最佳化。

32 abrasive   

adj.使表面磨损的；粗糙的；恼人的

参考例句：

• His abrasive manner has won him an unenviable notoriety.他生硬粗暴的态度让他声名狼藉。
• She had abrasions to her wrists where the abrasive rope had scraped her.她的手腕有多出磨伤，那是被粗糙的绳子擦伤的。

33 revolving   

adj.旋转的，轮转式的；循环的v.（使）旋转( revolve的现在分词 )；细想

参考例句：

• The theatre has a revolving stage. 剧院有一个旋转舞台。
• The company became a revolving-door workplace. 这家公司成了工作的中转站。

34 Augmented   

adj.增音的 动词augment的过去式和过去分词形式

参考例句：

• 'scientists won't be replaced," he claims, "but they will be augmented." 他宣称：“科学家不会被取代；相反，他们会被拓展。” 来自英汉非文学 - 科学史
• The impact of the report was augmented by its timing. 由于发表的时间选得好，这篇报导的影响更大了。

35 velocity   

n.速度，速率

参考例句：

• Einstein's theory links energy with mass and velocity of light.爱因斯坦的理论把能量同质量和光速联系起来。
• The velocity of light is about 300000 kilometres per second.光速约为每秒300000公里。