Special Discoveries and Inventions's Stories of Origin

Photocopy Machine

Sunday, February 17th, 2008

An electronically duplicator that transfers an image onto plain paper (bond) is known traditionally as a photocopy machine. A positive charge is given to a copier drum. The drum is now illuminated with the image and a potential image is thus formed. Toner is attracted to the drum with the force ...

Petrol Oil

Sunday, February 17th, 2008

Petrol or gasoline is mixture of hydrocarbons derived from crude petroleum through distillation. It is mainly used as fuel for internal combustion engines. ‘Petrol’ is used in most of the Commonwealth Countries while the term ‘Gasoline’ is basically used in North American Countries. Etymology of petrol is also quite interesting. ...