Image
EAN-139781556525261   EAN-13 barcode 9781556525261
Product NameThe Art Of The Catapult: Build Greek Ballistae, Roman Onagers, English Trebuchets, And More Ancient Artillery
LanguageEnglish
CategoryBook / Magazine / Publication
Short DescriptionPaperback
Amazon.comA Buy on Amazon ~ 1556525265
Model1556525265
Price New3.31 US Dollars    (curriencies)
Price Used0.80 US Dollars    (curriencies)
Width0.4 inches    (convert)
Height9.75 inches    (convert)
Length7 inches    (convert)
Weight12 ounces    (convert)
AuthorWilliam Gurstelle
Page Count192
BindingPaperback
Published07/01/2004
FeaturesLighthearted and engaging approach to world history, strategy, physics, math, Build 10 catapults and ancient devices, Discover authentic uses of catapults through the ages, Lively reading - consider the historical context and draw conclusions, Includes full materials lists with comprehensive instructions
Long DescriptionWhether playing at defending their own castle or simply chucking pumpkins over a fence, wannabe marauders and tinkerers will become fast acquainted with Ludgar, the War Wolf, Ill Neighbor, Cabulus, and the Wild Donkey—ancient artillery devices known commonly as catapults. Building these simple yet sophisticated machines introduces fundamentals of math and physics using levers, force, torsion, tension, and traction. Instructions and diagrams illustrate how to build seven authentic working model catapults, including an early Greek ballista, a Roman onager, and the apex of catapult technology, the English trebuchet. Additional projects include learning how to lash and make rope and how to construct and use a hand sling and a staff sling. The colorful history of siege warfare is explored through the stories of Alexander the Great and his battle of Tyre; Saladin, Richard the Lionheart, and the Third Crusade; pirate-turned-soldier John Crabbe and his ship-mounted catapults; and Edward I of England and his battle against the Scots at Stirling Castle.
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Created04-18-2012 1:05:00am
Modified05-01-2020 5:17:02pm
MD5c4e3cae00a23e5546b3b51c5711cb692
SHA256eed90fe149c51fb8fa34af927fb15ad3f6638b057fb84f1eac141477a030f65c
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Article of interest

This feature started with version 3.3 of the API and it allows you to update many fields of a product in one call. Prior to this, each attribute for a product was updated in a separate call, causing the process to be a bit slow.

It is important to note that bulk updates only work with JSON formatted data. Because of this, you can leave the mode=json out of your call.

You should use a POST call instead of a GET to avoid over running the length limits that can be found when sending long URLs.

Required Parameters

Optional Parameters

Each entry in the fields array is made up of keys and data. Some keys are required and some are optional depending on the data type being used. These entries mirror the single field update calls used when updating data one field at a time.

Details of the fields entries

An example of the JSON to update multiple fields for a single product

The order of each field in the array doesn't matter. We will process them in sequence but sequence makes no difference. So you don't have to sort them or place them in any partcular order.

You can actually update multiple products at the same time. To do this, you still need to pass some basic information for the first product in the required fields (see above). But in the fields JSON, you create an array of products, each with a fields sub-array. The product listed in the update field would be ignored for the most part but must still be valid. So it can be hardcoded when using this method as long as it is a vaild EAN code. 

An example of the JSON to update multiple fields for multiple products

It doesn't matter if you are updating a single product or multiple products. When the response is returned, the top level status is always going to be code 200 assuming your required fields passed the test. Then you will see an array of products even if you only passed in one to be updated. Each product entry and each field entry will have a status so you will know if individual updates worked or failed. This includes the imageURL you passed.

An example of the JSON returned after an update call


The return results in each img or status field

Try our data update wizard tool to generate sample code.

 

 

 

Examples of how to update images

Here are two examples of updating images. These both use a GET that you can test in your browser as soon as you insert your keycode. No other fields are being updated in these two examples. You would normally want to use POST in your code because there can be issues with very long GET requests losing data off the end. But these examples will work properly as GET or POST.

This first example is updating a single product image in simple mode using only form variables (no JSON)

https://eandata.com/feed/?test=1&v=3&keycode=[YOUR-CODE]&update=0025192251344&field=*bulk*&imageURL=https://schworak.com/image/0025192251344-Jaws.jpg

This next example is also updating a single product image, but because it is using JSON, you could pass multiple products in the outer "fields" array. Notice that each inner product block also has a "fields" list when using JSON.

https://eandata.com/feed/?test=1&v=3&keycode=[YOUR-CODE]&update=0025192251344&field=*bulk*&fields=[{%22ean%22:%220025192251344%22,%22imageURL%22:%22https://schworak.com/image/0025192251344-Jaws.jpg%22,%22fields%22:[]}]

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