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EAN-139780749687717   EAN-13 barcode 9780749687717
Product NameFossil Fuels (Energy Now & In The Future)
LanguageEnglish
CategoryBook / Magazine / Publication
Short DescriptionHardcover
Amazon.comA Buy on Amazon ~ 0749687711
SKUNU-GRD-00447645
Price New31.23 US Dollars    (curriencies)
Price Used0.01 US Dollars    (curriencies)
AuthorNeil Morris
Page Count48
BindingHardcover
Published08/14/2009
Long DescriptionEnergy use is one of the most important issues of our age. This new series looks at different sources of power that are in use today
Created11-16-2012 8:40:04pm
Modified01-12-2014 2:02:46pm
MD57abadf4962fa312369014a1968066802
SHA256b10504b44b479b75a2fb252a0719d9d9a7416043ac927cee28385bfc53444cd1
Search Googleby EAN or by Title
Query Time0.0053751

Article of interest

Code39 also known as Code 3 of 9 allows you to encode text using characters A-Z and 0-9 and some punctuation. Using an extended encoding system, it is possible to encode the entire ASCII character set.

barcode

Each character is made up of 10 elements where 5 are bars and 5 are spaces. You may have seen this described as 9 elements on other sites where 5 are bars and 4 are spaces but there is always a narrow space stripe between characters which means we might as well consider that trailing narrow space part of each character making the total number of elements 10. The final trailing narrow space simply appears to be absorbed into the quiet zone to the right of the final barcode. There is no check digit in this symbology unlike others. The variation between the width of the bars is what define the value of each character.

In the image below you will notice the start and stop block are the same. In most Code39 fonts,this is encoded as the asterisk (*) character although it is not displayed under the barcode. The text under the barcode is optional and is for human use only. The start and stop asterisks are not decoded when scanned and may or maynot bedisplayed. Also how the text is displayed depends on the process used to create the barcodes. Often, the text is simply under the barcode without the indent displayed in our sample.

barcode

Normally, there are only 43 characters that can be encoded using Code39. But if you want to encode the full ASCII characterset, you can prefix letters with special characters to get the characters you need including lower case and special characters. Although it is possible to encode the full ASCII set, if you actually need to do this it is better to use Code128 because it will produce a smaller barcode.

If you want to create your own Code39 barcode, you can visit our very own barcode generator page.

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