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Following the pattern established in Chapter 41, the application is
built around an instance of a subclass of the ApplicationModel class.
This time, the subclass is called the MeterDemonstration class.
That class has two instance variables, meterValueHolder and
meterViewHolder:
MeterDemonstration class definition
ApplicationModel subclass: #MeterDemonstration
instanceVariableNames: 'meterValueHolder meterViewHolder'
classVariableNames: ''
poolDictionaries: ''
category: 'Experiment'