. A text-book of radiology . ark coil differs in noessential particular from those used in medical treatment,but it will be as well to go over the various parts of amodern standard coil which are shown in the accompany-ing diagram. If we follow the current from the battery at the lower left-hand corner, at Tx it leads first to the screw d which carries one of the pair of platinum points B which are normally in contact. The current now travels down the spring which carries the second of the points B and the iron block H, and is then led to the primary winding PP on the iron core T, and so back
. A text-book of radiology . ark coil differs in noessential particular from those used in medical treatment,but it will be as well to go over the various parts of amodern standard coil which are shown in the accompany-ing diagram. If we follow the current from the battery at the lower left-hand corner, at Tx it leads first to the screw d which carries one of the pair of platinum points B which are normally in contact. The current now travels down the spring which carries the second of the points B and the iron block H, and is then led to the primary winding PP on the iron core T, and so back to the negative pole of the battery. ■p Morton 66 TEXT-BOOK OF RADIOLOGY. The current in traversing the core T renders the latterstrongly magnetic, and causes it to attract the iron blockH, separating the platinum points B. This breaks theflow of current—the magnetisation of T ceases, and byvirtue of its spring the iron block H is drawn away fromT until the contacts B again come together and the wholeprocess is Fig. 26. Diagram of Induction Coil (from Wrights Induction Coil). Owing to the enormous self-induction of the primarycoil there would be great flashing and burning of thepoints B if some means were not taken to suppress the demagnetisation of the core T would be so slowthat the necessary sudden change in the surroundingmagnetic field would be absent, and we would get a veryshort and useless spark from our coil. For this reason we introduce a condenser C± and C2,which at the moment of break absorbs the self-induc-tion current. This immediately rushes back through theprimary winding, neutralising any residual current andcompleting the demagnetisation of the core T. Whencontact is made again the condenser is short-circuited andidle, but made ready for action at the next break. INDUCTION COILS. 67 The current from a large spark-coil is an alternatingone, but the impulses in one direction are less than in theother. The smaller impulse is known as the c
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