Sentence:  The maximum rate of endowment was 5s. per week per <WSD>endowable</WSD> child, and the amount was reduced where the family income exceeded the living wage plus £13 per annum for each <WSD>endowable</WSD> child. 
Meaning of the word marked with <WSD> tags:  Eligible for endowment; able to be endowed or endowed upon.