30355
This became a source of a low-voltage current that could be used to produce more distinct effects , and which was far less limited than the momentary discharge of an electrostatic machine , which with Leyden jars were the only previously known man-made sources of electricity .
 person: Leyden
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Leyden 
Answer:
 person: Leyden