Sentence:  In some recent experiments with it at the Blind Asylum at Amsterdam, children of 6 learned very rapidly to write with the assistance of the <WSD>scotograph</WSD>, which is the invention of Dr. Nord, but it is especially designed for the use of scholars, etc., who have become blind late in life and still wish to continue their literary activity. 
Meaning of the word marked with <WSD> tags:  An instrument for writing in the dark, or by the (blind).