Dionysius Lardner — The Steam Engine Familiarly Explained and Illustrated — XXVI.

TEXT ❖ BASE Dionysius Lardner — The Steam Engine Familiarly Explained and Illustrated

Dionysius Lardner
The Steam Engine Familiarly Explained and Illustrated
CHAPTER XIX. PLAIN RULES FOR RAILWAY SPECULATORS.
XXVI.

XXVI.

Tunnels should be ventilated by shafts at intervals of not more than 200 yards.