Note 105 — VII THE INVESTMENT OF BOSTON
Reading edition
The tremendous air-compression in fortifications during gun-action almost always tears out parts of the general installation even in mere target practice. If fire-control installation, wiring, telephone systems, etc., are efficient only to the minimum degree, and there is no adequate reserve supply of material for repairs, they are certain to break down in any attack that is pressed with vigor. An attacked harbor-work is subjected to the most terrible destructive attempts that humanity has been able to devise.