1146. Electric bell demonstration
All parts easily visible rigid construction, mounted on teak wood board nicely polished workable on 3-4 volts a.c. or d.c.

1147. Geissler tubes set
A set 6 different shapes Geissler tubes 200 mm long, each tube is having different inside presure of air discharge phenomenon. Tubes are provided with permanent cemented caps for electrical connection, without induction coil.

1148. Geissler tubes set
Same as above in velvet lined case.

1149. Geissler tube set of 6
Same as item No. 1147 but fitted in glass case on polished teak wood stand. Complete with rotary switch at base for connection to one tube at a time.

1150. Spectrum, discharge tubes
Fitted with spectroscopically pure sample of gases. Straight form, with a piece of fine capillary 50 mm long (approx) in the middle. Total length of spectrum tube 200 mm.
Name of gas :
Ammonia, Argon, Carbon dioxide, Helium, Hydrogen, Krypton, Mercury vapours. Neon, Nitrogen. Oxygen, Sulphur, Water vapours.

1151. Spectrum, discharge tube, demonstration set
A set of 6 discharge tubes mounted on stand nicely finished complete with rotary switch at base for connection to one tube at time.

Crooks Tubes

1152. Shadow and stencil tube:
The tube is having on aluminium cross which cast a shadow when placed in the path of cathode rays to show affect of rectilinear propagation. On wooden stand.

1153. Electrical Radiometer:
Which is worked with mechanical effect of cathode rays. The vanes are painted different flourscent colours which glow beautifully when moving at high speed, Strobosopic effect is also observed.

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