123158
The methods of transmitting power known and practised by engineers are broadly included in two classes : mechanical including hydraulic , pneumatic and wire rope methods ; and electrical methods .... According to the new system , energy is transmitted from one point to another , which may be at a considerable distance , by means of impressed variations of pressure or tension producing longitudinal vibrations in solid , liquid or gaseous columns .
 None
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:  
Answer:
 None