CO129-165 - Sir Kennedy - 1873 [10-12] — Page 399

4,

to this dimension . The floor of the light-

room is 188 feet. 6 inches, above the mean sea level, which would make the focal plane 200 feet, and at this elevation it is sought that the lenticular apparaties should throw

-every ray of light as complete- ly as possible to the

horizon!? 8. The roof of the lanterns should be specially designed to ward off radiation and to ensure extra protection from

Porcibly powerfect effects of a tropical sun. with this view, a double roof might be designed capable of withe tanding

The force

of typhoons .

The

"The Ventilation of the lantern will also have to be specially considered and the space allowed for the escape of and foul

of heated

air at the apex of the rook should be not less than 150 inches.

10. For the design and execution of all in

and other metal work it onust be borne

in enind that the Cape L'Aquilar light house will be subjected almost yearly to the full force of the hurricanes pre-

-valent in these latitudes, and which are perhaps the most

The most fearful on record . It

will.

-."%EN-V---- An

307

will therefo & be essential to ensure the utmost strength and

4th and solidity in every

portion of the work even to the smallest detail. Horns panes should be

be provided. with the lantern capable of being put up on the shortest notice in the event of __

11. As it may possibly,

arise in endeavour:

ing to provide sufficient strength in the wrought iron standards of the lantern,

that the thickness

of them

may greatly increase the interception of light and

thereby diminish the power of the light be worth while to consider whether the

sensibly

may required stability may

by arrang

not be attained

anging the frame with a greater in

-clination inward, and

by rivetting

the

so as to

It so

so the

whole together in here of bolting

render it more,

more rigid. If

s

it

recessary rivets should accompany the iron work. 12. I would I further be advisable afters.

the structure has been put together at the

manufactury to paint corresponding marker on the different pieces which fit into one another; this would facilitate the putting

it together in Title which will be almost

entirely

of it