Account of the Skerryvore lighthouse — APPENDIX, No. IV. TABLE OF THE ELEMENTS OF CATADIOPTRIC ZONES SUITED FOR LIGHTS OF THE FIRST ORDER IN THE SYSTEM OF AUGU

←

Account of the Skerryvore lighthouse APPENDIX, No. IV. TABLE OF THE ELEMENTS OF CATADIOPTRIC ZONES SUITED FOR LIGHTS OF THE FIRST ORDER IN THE SYSTEM OF AUGU · ch 32/40

⇤ ⇥

…