The first reports of a mechanical dishwashing device are of an 1850 patent in the United States by Joel Houghton for a hand-powered wood device. This device was made of wood and was cranked by hand while water sprayed onto ...

Our project is to provide air at 20 degree centigrade and 40-50% relative humidity which will be used to cool a room in Pakistan. Pakistan experiences very high temperatures and long humid spells during the summer. Often ...