DIMKNSlnNs OF A TRANSFORM 11; 



in. nt indicated in Fig. 3 is the predecessor of a type which 



been put forward on various occasions, and, like most types, 



ha> its characteristic advantages and disadvantages. A modern 



development of the "circular-shell" type is known as the 



"Berry " transformer, and is shown diagrammatically in Fig. 4. 



"Berry" type is quite similar to Fig. 3 as regards the 



osition of the magnetic circuit and of tin- primary and 



secondary windings ; but the 



;he iron por; 

 nt, in that it U made up 

 of a numht ' UK t gr.nps 



ore plat->. The " Ben 



: lit r. Highly discussed by 

 Mr. A. 1 . l;, -rry in Vol II. of 

 " M- 



Miu-h <>l' a controvtTM;,! nuture 



has b t M \\ : the 



nii-rits of th tain 



and tlie shell t 

 \v-genera nted 



; as 

 electrical design is 



v little t<> choose 

 types. It 

 1 to note 



is rai 



:irni 

 ago, and wh hose 



n \\li.. have uiily rec.-ntlx Ml D l rulis- 



the 



it lr:uist'..Min i m buihl 



threr-pj,:^,- tl 



BON typ.- i- M.-ntlx n. -i. -uitai-M- foi 



\\li-. 



it up maiiN years 



