Sentence:  As we shall find it necessary, in our <WSD>endeavours</WSD> to bring electrical phenomena within the province of dynamics, to have our dynamical ideas in a state fit for direct application to physical questions we shall devote this chapter to an exposition of these dynamical ideas from a physical point of view. 
Meaning of the word marked with <WSD> tags:  A sincere attempt; a determined or assiduous effort towards a specific goal.