CO129-165 - Sir Kennedy - 1873 [10-12] — Page 398

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hit and miss Ventilator, and the

remain_

arrived out from England. apparaties, can arrive out

On the vertical axis of the light house and in the centre of the highest course which is

one 18 inches thick, a circular

The

coping

be

hole will be left 10 inches in diameter to receive the collar which holds the shaft of the apparatus . This hole can chipped to any larger diameter it on arrival the collar should be

to

into it.

e found

too

large to fit

3. It is desirable to leave to the Crown Agents the particular class of lenticular apparatus and construction of lantern to be selected, and the undersigned therefore will limit himself to a few appropriate

suggestions on The dimensions, and con-- struction of the light, room and it's acces-

sories.

4. As the lantern will nost

likely have

sixteen, sides it is recommended that the

light, room should be a sixteen sided polygon.

to be composed of of cast irow plates so as to form when lined inside

with wood, a circular chamber 12.

12 feet

in diameter; Fifteen plates to have each

a

a circular orifice

to be

furnished with

hit

}

-ing plate to be provided with a door lead- -ing from the light room to the outside

outside gallery balcony. A suitable iron hand rail - required for this outside

for this outside gallery.

of

5. The usual inner service gallery of

perforated cast now plates to

go round

the inside circumference of the lantern

iron

upon plates or walls. Iron steps leading up from the light room floor into the hunterns. The steps to be provided with a light suitable

brackets to be bolted to the vertical

handrail.

6 . Tole plate to fit on the top of the blocking. to be roughed and to project

and to project 12 inches so as

to form a path outside and round the Cautern for a

man to walk or stand upon the outside of the

a

while cleaning

sole plate will also form,

of the

: the glass. The

an lave to shelter

the light-room Ventilators against rain.

7.

"The height of the light room floor above

the mean sea level has been based on the - assumption, that the height of the focal plane, above it (the floor) would be 11 feet Cincher. It would therefore be desirable - if it can be done conveniently.

to adhere

to