Apart from having to learn new words ("scear"=sear, "half-cock bent"=half-cock notch, "bullet envelope"=bullet jacket,) I'm mostly struck by the feeling of a message in a bottle from a parallel universe. Here are the words of a gentleman who shares my career field, coming from a land where that field is now, for all practical purposes, abolished. They echo to the present from a time of danger, as the publisher's note in the front of the book grimly states
"The completion of this work was interrupted by the breaking out of the present war..."and the Author's Forward is addressed from his duty station with the 85th Field Regiment of the Royal Artillery.
I wonder where Lt. Col. Wilson's England went?