THE EQUIPMENT 



55 



Parkinson Making a "Dust-Count" 

 Even over the oceans, far from land, the atmosphere is polluted by microscopic particles 

 of dust — the presence of this material in the air affects the electrical conditions of the 

 atmosphere. 



the fact that we were cooped up in a ship. Anyone who has 

 travelled in an ordinary steamer will know how uncomfortable 

 the usual swivel-chair can be — made as it is to accomodate the 



