982 



Voltaic Electricity. Section 7: Induction Currents. 



No. 62650 



62 661. 1 : 4. 



62 666. l : r>. 



Small Induction Coils, simple pattern, Figure, with Platinum Interrupter, without Commit- * (1 

 tator, on polished mahogany box, coil of wood, not detachable 



List No. 62,652 62,653 62,654 62,655 62,656 

 Spark -length mm 6 10 15 20 30 



0.10.0 0.15.0 1.13.0 2.0.0 2.10.0 



i d e m, with simple Commutator. 



List No. 62,657 62,658 62,659 62,660 



Spark-length mm 12 15 20 30 



1.0.0 1.18.0 2.5.0 2.15.0 



62,661. Induction Coil, for demonstration purposes, can be taken to pieces, Figure, with 



adjustable secondary coil and Condenser which can he drawn out; spark-length 40 mm 6. u. 



Carrying Cases for Induction Coils. 



List No. 62,662 62,663 62,664 62,665 



For Size 0000 15 68 911 



1.5.0 1.10.0 1.15.0 2.10.0 



Interrupters. 



(a) Electrolytic Interrupters for Direct and Alternating Current. 



The Electrolytic Interrupters are charged with dilute sulphuric acid (if 1,06 to 1.12 sp. gr. 



i'nr prices of Wehnelt Interrupters arc liable to alteration without notice on account of the fluc- 

 tuations in the price of platinum. 



62.666. Wehnelt Interrupter for Direct Current with 1 platinum pin 1 nun thick, with large 



glass vessel, Figure, with conical porcelain tube ............... 3. Id. u 



02.667. Wehnelt Interrupter for Direct Current, with 3 platinum pins l mm thick, with large 



glass vessel .................................. 6.16.0 



62.668. Wehnelt Interrupter with 1 platinum pin 3 mm thick, for working with Alternating 

 Current, ef. Figure 62,666 .......................... :. Id. 



It is possible to work with Alternat mi; Current but this cannot l>e recommended as the platinum 

 pin is rapidly consumed and regulation difficult. The primary coil also must lie specially tuned". 



5345, 2850. 



