Faraday to Arthur Watson   3 April 1849¹

1 Is there any return of air down the ventilating tubes and does it affect the light and how?

2 If any return is it constant or only now & then?

3 If only now & then what appears to be the cause of it?

6 How is the wind & weather at those times?

4 Are both the upper & lower tier of lamps affected - or one more than the other?

5 Are all the lamps on one tier affected alike?

8 How does air enter into the lanthorn to ventilate it?

7 Is there a stove in the lanthorn and where does its chimney go; through the roof or into the cowl.

9 Is there any door between the lanthorn & watch room?

10 Is there any door between the watch room & the tower?

3 April 1849

Royal Institution | 3 April 1849

Sir

In reference to a communication of yours to the authorities of the Trinity house² I have, by their authority³, to request that you will have the goodness to send answers to the enclosed questions + to my address at the Royal Institution Albemarle Street London, with any other information that you think will illustrate the case⁴[.]

I am | Yours &c | M. Faraday

Mr Watson | Lighthouse keeper | Dungeness Light Establishment | Kent.

+ as above