Egyptian Shaduf - Revision history

DT Online at 10:31, 11 May 2017

2017-05-11T10:31:05Z

← Older revision		Revision as of 10:31, 11 May 2017
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	* How does the [http://en.wikipedia.org/wiki/Shadoof '''Shaduf'''] make it easier to lift the mass?		* How does the [http://en.wikipedia.org/wiki/Shadoof '''Shaduf'''] make it easier to lift the mass?
	* Does it matter where you position the counterweight?		* Does it matter where you position the counterweight?
	* Should the counterweight balance an empty bucket or a bucket filled with water?		* Should the counterweight balance an empty bucket or a bucket filled with water - or half filled with water?
	* How heavy would the counterweight be to lift a litre of water?		* How heavy would the counterweight be to lift a litre of water?
	* How might the design limit the height to which pyramid stones could have been lifted in this way?		* How might the design limit the height to which pyramid stones could have been lifted in this way?

DT Online at 10:29, 11 May 2017

2017-05-11T10:29:58Z

← Older revision		Revision as of 10:29, 11 May 2017
Line 24:		Line 24:
	* How does the [http://en.wikipedia.org/wiki/Shadoof '''Shaduf'''] make it easier to lift the mass?		* How does the [http://en.wikipedia.org/wiki/Shadoof '''Shaduf'''] make it easier to lift the mass?
	* Does it matter where you position the counterweight?		* Does it matter where you position the counterweight?
	* Should the counterweight balance an empty bucket or a bucket		* Should the counterweight balance an empty bucket or a bucket filled with water?
	* How heavy would the counterweight be to lift a litre of water?		* How heavy would the counterweight be to lift a litre of water?
	* How might the design limit the height to which pyramid stones could have been lifted in this way?		* How might the design limit the height to which pyramid stones could have been lifted in this way?

DT Online at 09:16, 1 March 2017

2017-03-01T09:16:21Z

← Older revision		Revision as of 09:16, 1 March 2017
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	[[File:Shaduf2.jpeg\|right\|250px\|Shaduf\|link=~~https~~://en.wikipedia.org/wiki/Shadoof]]		[[File:Shaduf2.jpeg\|right\|250px\|Shaduf\|link=http://en.wikipedia.org/wiki/Shadoof]]
	__TOC__		__TOC__

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	=====Description=====		=====Description=====

	A [~~https~~://en.wikipedia.org/wiki/Shadoof '''Shaduf'''] ''(aka '''Shadoof''')'' is hand-operated simple '''[[Basic Machines\|machine]]''' for lifting water to irrigate land still used in India, Africa, Egypt, and some other countries. Typically it consists of a long pole or beam mounted like a tall seesaw. There is a water bucket suspended from one end and a counterweight is positioned towards the other.		A [http://en.wikipedia.org/wiki/Shadoof '''Shaduf'''] ''(aka '''Shadoof''')'' is hand-operated simple '''[[Basic Machines\|machine]]''' for lifting water to irrigate land still used in India, Africa, Egypt, and some other countries. Typically it consists of a long pole or beam mounted like a tall seesaw. There is a water bucket suspended from one end and a counterweight is positioned towards the other.


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	=====Task=====		=====Task=====

	* Build a model [~~https~~://en.wikipedia.org/wiki/Shadoof '''Shaduf'''] and use it to lift a 1kg mass.		* Build a model [http://en.wikipedia.org/wiki/Shadoof '''Shaduf'''] and use it to lift a 1kg mass.
	** use '''[[:Category:Stripwood Technology\|Stripwood]]''' to build the main frame.		** use '''[[:Category:Stripwood Technology\|Stripwood]]''' to build the main frame.
	** you may wish to fill part of the lid from a spray can or a paper cup with [~~https~~://en.wikipedia.org/wiki/Plasticine ‘plasticine’] or similar to make a counterweight.		** you may wish to fill part of the lid from a spray can or a paper cup with [http://en.wikipedia.org/wiki/Plasticine ‘plasticine’] or similar to make a counterweight.
	** the top of a spray can or a paper cup may also be used to model a water bucket.		** the top of a spray can or a paper cup may also be used to model a water bucket.

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	=====Testing=====		=====Testing=====

	* How does the [~~https~~://en.wikipedia.org/wiki/Shadoof '''Shaduf'''] make it easier to lift the mass?		* How does the [http://en.wikipedia.org/wiki/Shadoof '''Shaduf'''] make it easier to lift the mass?
	* Does it matter where you position the counterweight?		* Does it matter where you position the counterweight?
	* Should the counterweight balance an empty bucket or a bucket		* Should the counterweight balance an empty bucket or a bucket

DT Online: Added Category

2016-11-23T09:26:17Z

Added Category

← Older revision		Revision as of 09:26, 23 November 2016
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	[[Category:Primary]]		[[Category:Primary]]
			[[Category:Topics, Projects and Tasks]]
	[[Category:Ancient Egypt]]		[[Category:Ancient Egypt]]

DT Online: Created article

2016-10-06T12:41:16Z

Created article

New page

[[File:Shaduf2.jpeg|right|250px|Shaduf|link=https://en.wikipedia.org/wiki/Shadoof]]
__TOC__

=====Description=====

A [https://en.wikipedia.org/wiki/Shadoof '''Shaduf'''] ''(aka '''Shadoof''')'' is hand-operated simple '''[[Basic Machines|machine]]''' for lifting water to irrigate land still used in India, Africa, Egypt, and some other countries. Typically it consists of a long pole or beam mounted like a tall seesaw. There is a water bucket suspended from one end and a counterweight is positioned towards the other.

[[File:EgyptianShaduf.png|right|350px]]
In use, the water bucket suspension rope is pulled down to lower the bucket into the water and then lifted out with the aid of the counterweight when filled. In both actions, the top beam serves mainly as a '''[[Class 1 Lever]]''': pulling against the counterweight as the bucket is lowered and, as it is raised, the counterweight provides the '''Effort''' to lift the weight of water ''(plus a little extra effort provided by the operator pulling the bucket upwards)''.

=====Task=====

* Build a model [https://en.wikipedia.org/wiki/Shadoof '''Shaduf'''] and use it to lift a 1kg mass.
** use '''[[:Category:Stripwood Technology|Stripwood]]''' to build the main frame.
** you may wish to fill part of the lid from a spray can or a paper cup with [https://en.wikipedia.org/wiki/Plasticine ‘plasticine’] or similar to make a counterweight.
** the top of a spray can or a paper cup may also be used to model a water bucket.

=====Testing=====

* How does the [https://en.wikipedia.org/wiki/Shadoof '''Shaduf'''] make it easier to lift the mass?
* Does it matter where you position the counterweight?
* Should the counterweight balance an empty bucket or a bucket
* How heavy would the counterweight be to lift a litre of water?
* How might the design limit the height to which pyramid stones could have been lifted in this way?
* How would you make a [http://wiki.dtonline.org/index.php/Truss_Bridge_Models#Large_Scale_Models '''larger model'''] using garden canes for example?

{{Stripwood Frames Buyers Guide}}

[[Category:Primary]]
[[Category:Ancient Egypt]]