APPENDIX.

[1.]Table of Co-ordinates of Hyperbolic Column.
[2.]Notes on the Making of Paraboloïdal Mirrors.
[3.]Notes on the Grinding and Polishing of Dioptric Instruments for Lighthouses.
[4.]Table of the Elements of the Catadioptric Zones for Lights of the first order in the system of Augustin Fresnel.
[5.]Notice to Mariners of the Exhibition of the Skerryvore Light.
[6.]Detailed Account of the Expense of the Skerryvore Lighthouse.
[7.]Excerpts from Account of Experiments on the Force of the Waves of the Atlantic and German Oceans, by Thomas Stevenson, F.R.S.E., Civil Engineer.
[8.]Annual List for 1848 of Lighthouses, Beacons, and Buoys, in the District of the Northern Lights Board.
[9.]Annual Report by the Secretary as to the Income and Expenditure of the Northern Lights Board for 1846.
[10.]Instructions to the Light-keepers in the Service of the Commissioners of the Northern Lighthouses.