Chapter 3 Part 14
Convert the E.M.F. of the current supplied to a voltage suit- able for the X-ray tube. The degree of this function may be appreciated when we note that to produce a 12-inch spark across the discharging points of a coil requires a potential of about 148,000 volts. This increase in voltage is obtained at a corresponding loss in amperage, and the product of the two factors—technically expressed as Watts—in the current derived from the coil should approach that in the current supplied, a slight loss being inevitable. No satisfactory method exists, however, whereby the output of a coil may be accurately measured.
The action of a coil is commonly expressed in terms of the length of spark which it is able to send across the terminals of its secondary when the primary is supplied with a suitable exciting current, but this expression is misleading. Formerly, indeed, it was the custom to consider the spark- length as synonymous with the power of a coil to do good X-ray work, and a spark of from 16 to 20 inches was considered a desideratum for a good X-ray coil. But we now recognise that a coil with a maximum spark of 10 to 12 inches may be capable of satisfying all our requirements, and we pay more attention to the nature or ‘ thickness’ of the spark emitted. Thus, in our hospital installation, the coil gives us the full spark-length with a current of 4 amperes, but we commonly use 6 to 8 amperes, and may pass as much as 12 amperes at an odd time. The additional current does not lengthen the spark, but increases its intensity or fullness. This coil, we may say, is designed to work nominally with interruptions at the rate of 600 per minute, this being considered a mean rate for usual work. There is, of course, a margin of reasonable efficiency above and below this rate.
No related posts.
Tom Thym on December 11th 2009 in x-ray
NEIL responded on 07 Sep 2010 at 8:22 pm #
Buy:100% Pure Okinawan Coral Calcium.Synthroid.Accutane.Nexium.Retin-A.Prednisolone.Arimidex.Lumigan.Zovirax.Valtrex.Actos.Human Growth Hormone.Prevacid.Zyban.Petcam (Metacam) Oral Suspension.Mega Hoodia….
NICHOLAS responded on 11 Nov 2010 at 2:36 am #
…
BUY FASHION. TOP BRANDS: GUCCI, DOLCE&GABBANA, BURBERRY, DIESEL, ICEBERG, ROBERTO CAVALLI, EMPORIO ARMANI, VERSACE…
CARLOS responded on 18 Dec 2010 at 8:20 am #
████████►BUY CIALIS◀████████…
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲…
LONNIE responded on 20 Dec 2010 at 12:22 pm #
abilify side effects in children…
Buydrugs without prescription…
KARL responded on 24 Dec 2010 at 3:50 pm #
Abilify…
Buygeneric pills…
ANTHONY responded on 25 Dec 2010 at 10:54 am #
rxlist@abilify.now” rel=”nofollow”>..…
Buydrugs without prescription…
WALTER responded on 27 Dec 2010 at 6:06 am #
Abilify@official.site” rel=”nofollow”>……
Buyno prescription…
EUGENE responded on 28 Dec 2010 at 4:12 pm #
Advair@official.site” rel=”nofollow”>.…
Buynow it…
CLAUDE responded on 29 Dec 2010 at 6:33 pm #
Allegra@official.site” rel=”nofollow”>……
Buygeneric pills…
KELLY responded on 30 Dec 2010 at 10:22 am #
Ampicillin@official.site” rel=”nofollow”>.…
Buynow it…
LARRY responded on 31 Dec 2010 at 2:10 am #
..…
Buygeneric drugs…
ALBERTO responded on 01 Jan 2011 at 8:08 am #
Augmentin@official.site” rel=”nofollow”>.…
Buywithout prescription…
RICK responded on 01 Jan 2011 at 4:41 pm #
Clonidine@official.site” rel=”nofollow”>……
Buynow…
RICK responded on 02 Jan 2011 at 4:49 am #
celexa@canada.now” rel=”nofollow”>.…
Buynow…
DOUGLAS responded on 17 Jan 2011 at 4:29 am #
Abilify@official.site” rel=”nofollow”>……
Buynow…
HUBERT responded on 17 Jan 2011 at 7:20 am #
Abilify@official.site” rel=”nofollow”>……
Buynow it…
JULIAN responded on 21 Jan 2011 at 5:00 am #
depakote@400mg.now” rel=”nofollow”>.…
Buywithout prescription…
GABRIEL responded on 03 Feb 2011 at 8:51 am #
Benuryl…
Buywithout prescription…
GLENN responded on 03 Feb 2011 at 10:30 pm #
Zyrtec…
Buygeneric pills…
DAN responded on 04 Feb 2011 at 9:07 am #
zovirax acyclovir…
Buydrugs without prescription…
CLINTON responded on 05 Feb 2011 at 3:32 am #
Zocor…
Buygeneric meds…
JAMIE responded on 06 Feb 2011 at 9:57 am #
Zyrtec…
Buygeneric drugs…
REGINALD responded on 06 Feb 2011 at 11:51 pm #
dog zyrtec…
Buygeneric drugs…
ALFONSO responded on 02 Mar 2011 at 11:35 pm #
Zyvox…
Buydrugs without prescription…
VICTOR responded on 03 Mar 2011 at 6:01 pm #
kids tylenol recall…
Buygeneric meds…
CHAD responded on 04 Mar 2011 at 8:10 am #
Zyprexa…
Buydrugs without prescription…
BRIAN responded on 06 Mar 2011 at 5:33 am #
should i stop savella before surgery…
Buygeneric meds…
NORMAN responded on 08 Mar 2011 at 6:04 am #
Rocaltrol…
Buygeneric drugs…
ANDY responded on 08 Mar 2011 at 5:30 pm #
Pulmicort…
Buywithout prescription…
TERRANCE responded on 09 Mar 2011 at 2:00 am #
howard county purim carnival 2010…
Buyno prescription…
AARON responded on 09 Mar 2011 at 1:54 pm #
Risperdal…
Buygeneric pills…
WARREN responded on 10 Mar 2011 at 3:35 pm #
Risperdal…
Buydrugs without prescription…
ROBERTO responded on 11 Mar 2011 at 12:55 am #
low dose haldol and paxil…
Buygeneric drugs…
CLAUDE responded on 29 Mar 2011 at 8:14 am #
Tri@Cyclen.now” rel=”nofollow”>……
Buyno prescription…
GEORGE responded on 29 Mar 2011 at 4:32 pm #
Soma@Soma.Soma” rel=”nofollow”>.…
Buyno prescription…
JOSE responded on 30 Mar 2011 at 8:11 am #
Purim@Purim.Purim” rel=”nofollow”>..…
Buygeneric pills…
SAM responded on 30 Mar 2011 at 9:59 am #
Purim@Purim.Purim” rel=”nofollow”>……
Buygeneric drugs…
EDGAR responded on 30 Mar 2011 at 7:43 pm #
Singulair@Singulair.Singulair” rel=”nofollow”>……
Buygeneric pills…
TYRONE responded on 30 Mar 2011 at 8:12 pm #
Prozac@Prozac.Prozac” rel=”nofollow”>.…
Buygeneric pills…
SEAN responded on 31 Mar 2011 at 11:05 am #
Singulair@Singulair.Singulair” rel=”nofollow”>.…
Buygeneric drugs…
CORY responded on 31 Mar 2011 at 2:10 pm #
Rogaine@Rogaine.Rogaine” rel=”nofollow”>..…
Buynow it…
BENJAMIN responded on 31 Mar 2011 at 7:06 pm #
prozac@is.great” rel=”nofollow”>……
Buygeneric drugs…
BRENT responded on 01 Apr 2011 at 9:13 am #
……
Buygeneric pills…
KEVIN responded on 01 Apr 2011 at 11:41 am #
.…
Buyit now…
HOWARD responded on 02 Apr 2011 at 9:46 am #
can@you.take.aleve.and.darvocet.together” rel=”nofollow”>..…
Buygeneric drugs…
MANUEL responded on 02 Apr 2011 at 11:28 am #
allegra@print.colorado.springs” rel=”nofollow”>……
Buygeneric drugs…
DARREN responded on 02 Apr 2011 at 11:42 pm #
how@to.get.quinine” rel=”nofollow”>.…
Buywithout prescription…
DARRYL responded on 03 Apr 2011 at 12:47 pm #
losee@weight.on.coumadin” rel=”nofollow”>..…
Buygeneric meds…
KIRK responded on 04 Apr 2011 at 12:30 pm #
alternatives@to.premarin” rel=”nofollow”>……
Buygeneric pills…
CODY responded on 04 Apr 2011 at 2:04 pm #
prevacid@childrens.chewable” rel=”nofollow”>.…
Buygeneric drugs…
ADRIAN responded on 04 Apr 2011 at 11:43 pm #
altace@generic.name” rel=”nofollow”>.…
Buynow it…
RAMON responded on 05 Apr 2011 at 1:45 am #
lidocaine@generic.name” rel=”nofollow”>……
Buygeneric pills…
JOSE responded on 05 Apr 2011 at 1:14 pm #
abilify@urges.results” rel=”nofollow”>..…
Buygeneric drugs…
CLIFTON responded on 06 Apr 2011 at 10:59 am #
fml@internet.lingo” rel=”nofollow”>..…
Buyit now…
ANDY responded on 06 Apr 2011 at 12:45 pm #
folic@acid.hpv” rel=”nofollow”>..…
Buyno prescription…
BRETT responded on 06 Apr 2011 at 11:59 pm #
somnolence@and.geodon” rel=”nofollow”>..…
Buywithout prescription…