Note 47 — PART SECOND. NOTES ON THE ILLUMINATION OF LIGHTHOUSES, WITH SHORT NOTICES OF THEIR EARLY HISTORY. (continued 2)
Reading edition
See Peclet′s Traité de l′Eclairage, p. 302, from which fig. 46 is copied.
Reading edition
See Peclet′s Traité de l′Eclairage, p. 302, from which fig. 46 is copied.