Does anyone know how to adjust a Sampsee Time Control thermostat?

I have a Sampsee Time Control thermostat for my boiler. It is OLD. My boiler has a date stamp of 1904, and the thermostat may be as old. I am trying to find out what the adjustments screws on it do, because it seems to run way too long after the temperature has already been reached and it also is not kicking on as soon as it 'should'. Any ideas?