TABLE 3O1 . 



DISSIPATION OF ENERGY IN THE CYCLIC MAGNETIZATION OF TRANS- 

 FORMER CORES.* 



This table gives, for the most part, results obtained for transformer cores. The electromagnet core formed a closed 

 iron circuit of about 320 sq. cms. section and was made up of sheets of Bessemer steel about 1-20 inch thick. The 

 No. 20 transformer had a core of soft steel sheets about 7-1000 inch thick insulated from each other by sheets of 

 ihin paper. The cores of the other transformers were formed of soft steel sheets 15-1000 inch thick insulated from 

 each other by their oxidized surfaces only. The following are the particulars of the data given in the different 

 columns : 



Column i. Description of specimen. 



2. The total energy, in joules per cycle, required to produce the magnetic induction given in column B 



3. The energy, in joules per cycle, returned to the circuit on reversal of the magnetizing force. 



4. The energy dissipaied, in joules per cycle, or the difference of columns 2 and 3. 



5. 6, and 7. The quantities in columns 2, 3, and 4 reduced to ergs per cubic centimetre of the core. 

 B. The maximum induction in c. g. s. units per sq. cm. 



* T. Gray, from special experiments ; see Table 285 for other properties. 

 SMITHSONIAN TABLES. 



282 



