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Sample Articles Note wee of om SLLUSTRATION: WIRE-WOUND RESISTORS ‘These articles have been written for & science encyclo- ft csppimoest pedia. We intend them to serve as examples of the mechanics the teat Two classes of wire are commonly ueed—aicbel- ‘of presentation, We do not intend them es examples of style nectotion comer Agppicngneniagt ss oy m, Nickel oper epee or level of presentation. resistivity ‘loys, low resistances can bo obtained with Deliahion: RESISTOR, « compound of an electric circuit that Denctical wire sizes, Low resistivity alloys, howewss, aera feat" offers opposition, or resistance, to electric current. usually have high temperature coskicients of reste weer all materials exhibit the property of electrical tance. resistance in varying degree, only @ designed More detail 2, see] wed for the purpose of introducing resistance ints . -thist the beginning of an article on « top of interst to the reader What te 8~ are vat ie called a resbstor. The electrical value of secking general Information, ax well as to the reader seeking move SPs © eeioter is given in obmd, the unit of electrical re, seckiog Brtormation, ‘The entire introductory section has been, weittss Preseots temo sistance, Restors are also rated in watts of electrical for a general auilience. Note that some technical terms have been ox- ary veel power they can dissipate. , lel ne to ce me saijet. terms exp! . After the introduction, article assumes Fox 1 dicusion of the propery of reutansn fee tetcal level, but te writing is oil Kept ax ekmple at possible Rene ELECTRICAL, ee does the discussion ascend to the level of the specialist Prarpeee: Anowt Recistors may be used to limit the current tas <it~ bra cok onc mnatoy-sesting resister), to produce a desired wed fort™ Soktage drop (ax a cathode resistor for a vaceume tube), to divide the voltage applied to 2 circuit or Jeeies (at a volume control on a radio), oF, ts om: deve with capsciors or inductors, to shift the ‘time-phase relationship of an electrical signal (as in ‘an RC oscillator). For « discussion of the effect of Asswar qesitions, ANTHRAX, en infectious disease, primarily of animals. Man may be secondarily infected, It is caused Ia SY Dy Bocillus anthracts, » rod-shaped bectertum. tnimals, the disease, known ss splenic fever, occurs when spores of Bacillus enthrects sre seated forage. In man, the disease is contracted by resistors in circults see |, ELECTRICAL, ALTER" Neto wae of MATING CURRENT; CORTE, ELECTRICAL, DORACT-CUR contact with Infected animele or anima! products eroet reference = REST. such as bone meal, meat, hide, and fur, The discase Securs in nearly every country in the world. From Resistors may be classified by the resisting material resistors, ome ‘aati used. The most common sre scblect eaesa —ethich use a metal tiloy wire to furnish the desired in thirty-nine states of the United States, with boeses of Mesistance, end composition redatore, which use car 17,804 head of bon or graphite. * ILLUSTRATION: PHOTOMICROGRAPH Resistors are also classified ax Bred, adjustable, of " variable. Fred and adjustable resistors are OF BACILLUS ANTHRACIS In this article. For vatiable fealstors, soe RNBOFTAT eausative Raciflue enthrecks, 1s @ and POTENTIOMETER. ones rod-shaped bectiies $6 6 meee te Reger ire-wound wound lengt to 1.2 microns in diameter, ‘longs Baten ay iene Cnualy encloned by ae ve cot sent ily, Bacillaceae, Ht occurs In infected and- following, sore poe made with Fesistance retings ranging from « Teale as chains of connected bacilli surrounded by & —,, frection of an ohm to several Tenge capsule, but whe grown oe artificial media the capsule 1s lost and the chains contain more beciltt Under conditions unfavorable for growth, the bacilli form small, ellipsoidal spores which are very resistant resistence values of general-purpose are 5 to temperature extremes and to dehydration, The Perce esi es low a1 0.) porcont ” whieh oe be «= < bi . shout wr yas, sr nee evils ne