Elementary Treatise On Natural Philosophy
Elementary Treatise On Natural Philosophy
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204.
Fig 424. Ship's Compass.
METHODS OF MAGNETIZATION.
635 an index for reading off on the card the direction to which the ship's head is turned. Sometimes a reflector is employed, as m in the first figure, in such a position that an observer looking in from behind can read oft' the indi- cated direction by reflection, and can at the same time sight a distant object whose mag- netic bearing is required. The origin of the compass is very obscure. The ancients were aware that the loadstone at- t...racted iron, but were ignor- ant of its directing property. The instrument came into use in Europe some time in the course of the thirteenth cen- tury.
503. Methods of Magnetization. The usual process of magnetizing a bar consists in rubbing it with or against a bar already magnetized. Different methods of doing this, called single touch, double touch, &c. , have been devised, in which magnetized bars of steel were the mag- netizing agents. Much greater power can, however, be obtained by means of electro-magnetism ; and the two following methods are now almost exclusively employed by the makers of magnets.
What to read after Elementary Treatise On Natural Philosophy?
You can find similar books in the "Read Also" column, or choose other free books by A Augustin Privat Deschanel to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
204.
Fig 424. Ship's Compass.
METHODS OF MAGNETIZATION.
635 an index for reading off on the card the direction to which the ship's head is turned. Sometimes a reflector is employed, as m in the first figure, in such a position that an observer looking in from behind can read oft' the indi- cated direction by reflection, and can at the same time sight a distant object whose mag- netic bearing is required. The origin of the compass is very obscure. The ancients were aware that the loadstone at- t...racted iron, but were ignor- ant of its directing property. The instrument came into use in Europe some time in the course of the thirteenth cen- tury.
503. Methods of Magnetization. The usual process of magnetizing a bar consists in rubbing it with or against a bar already magnetized. Different methods of doing this, called single touch, double touch, &c. , have been devised, in which magnetized bars of steel were the mag- netizing agents. Much greater power can, however, be obtained by means of electro-magnetism ; and the two following methods are now almost exclusively employed by the makers of magnets.
What to read after Elementary Treatise On Natural Philosophy?
You can find similar books in the "Read Also" column, or choose other free books by A Augustin Privat Deschanel to read onlineMoreLess
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