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EAN-139780812404630   EAN-13 barcode 9780812404630
Product NameThe Comic Adventures Of Old Mother Hubbard And Her Dog
LanguageEnglish
CategoryBook / Magazine / Publication
Short DescriptionPrebound
Amazon.comA Buy on Amazon ~ 0812404637
SKU1144613
Price Used5.00 US Dollars    (curriencies)
Width8.5 inches    (convert)
Height0.4 inches    (convert)
Length10.9 inches    (convert)
Weight12.8 ounces    (convert)
BindingHardcover
Published03/01/1981
Long Description
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.

This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.

As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Created11-09-2012 8:05:49pm
Modified09-04-2017 10:54:53pm
MD57bdb3c97843b1d12ed4110a3486c7a31
SHA256b6ec14f0c094a4c832146a1d370d7db630e64ad85d93e26b5f3660b60dd10aa9
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There are many types of barcode scanners out on the market ranging from inexpensive wonds that look like pens all the way up to retail table scanners that are very fast and accurate. The scanner you select depends on your needs which is dictated by the type of barcodes you will be scanning, the volume and speed at wich you need to scan.

pen barcode scannerThe wand or pen scanner is one of the least expensive scanners in most cases. Although these are easy to use, they are limited in speed and accuracy of what they can scan. These are wonderful for low volume environments where you need to scan simple barcodes. These are used by pressing the pen to the paper and drawing it across the barcode. The light at the end of the pen registers the light and dark bars as the pen passes over them and transmit the data to the receiver. The main drawback to these scanners are the speed at which they can scan with any accuracy. It often takes a little practice to get the timing correct. Too slow or too fast and the barcode won't be recognized. This can limit the number of codes that can be scanned.

handheld barcode scannertable top barcode scannerA step up from the wand scanner is the hand or table top scanner. These often emit a laser beam that sweeps across the barcode scanning it quickly and accuratly and passing it along to the receiver. Table top units usually emit multiple beams or a single beam which is split or refracted into multiple beams making the scanning process happen faster. The hand held units can emit a laser or use a CCD to pulse the barcode. In either case, the dark and light bars are scanned in much the same way as the wond but faster. The need to learn the timing of the swipe is not needed with these scanners. Instead, the distance and angle of the barcode from the scanner is what is key to a quality scan. Hand held and table top barcode scanners come in both wired and wireless models. The wireless scanners make it possible to move through a warehouse, store or ther are scanning items without being teathered to a computer or POS station. Some wireless hand heald scanner even have keypads on them that allow quantity, descriptions or other information to be entered at the time of the scan process. You have probably seen these types of scanners being used in your local grocery store as inventory is being done. If you have a moderate volume of codes to scan or need portability, these units could be for you.

table barcode scannerFor situations where high speed, high accuracy scanning is required, a built-in table scanner is required. These are the types of scanners you see at the grocery store. The products are quickly passed over the scanner which often has multiple scanning beams and can read the product form multiple angles. This reduces the need for the person operating the scanner to worry about the exact distance or angle of the barcode to the scanner. This type of scanner is also used in industrial situations where items are scanned as they fly down the production line. These industrial versions are often larger and more robust in their design but they have the same basic functionality built into them.

All of the scanners we have talked about so far are limited to 1D barcodes. These are the codes that are made up of lines and are read as the scanner reads in the dark and light bars. The main difference between the scanners is the speed and accuracy and of course the price. But in general they all serve the same basic function and operate in the same basic way.

2D image barcode scannerThere is another type of barcode scanner. These can usually scan the 1D barcodes just like the previous models but they can also scan the 2D barcodes such as the QR Codes which store a great deal of data in a tightly packed area. These work not by sweeping across the barcode in one direction, but by looking at the entire code at one time both vertically and horizontally. This type of scanner can come in many forms. You may even have one of these built into your phone. These full image scanners come in many price ranges. The version you have on your phone may have been free or cost only a couple dollars. Larger versions are available as hand heald, desktop and even industrial scanners. Just like the 1D scanners, what you scan and how often you scan will determine which type of scanner you need. For the average individual the low end scanner is normally enough but businesses will find that more reliable and faster scanners are a better investment even though they are more expensive.

As with any product, it is important to determine your need before you make your purchase. And whend possible it is a good idea to test out the scanners before spending a great deal of money. 

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