[ 238 J 
XLVI. An Account of Experiments made at Constantinople 
on Drummond’s Light, for the purpose of Lighthouse Illu- 
mination in the Black Sea. By W. H. Bartow, Esgq., Civil 
Engineer. Communicated by P. Barlow, Esq., F.B.S., in a 
Letter to the Editors of the Lond. and Edinb. Philosophical 
Magazine and Journal of Science. 
GENTLEMEN, Royal Military Academy, Feb. 4, 1836. 
I CAN hardly tell how far the following account of experi- 
ments made on Drummond’s light at Constantinople may 
be considered deserving a place in your scientific Journal: it 
is to me highly interesting, on account of the ingenuity and 
perseverance it displays in the pursuit of a scientific object, 
under very difficult circumstances; and I think that it must 
be gratifying to scientific men generally to know that the 
Turks, hitherto so bigoted to old maxims and religious pre- 
judices, are availing themselves of the most refined disco- 
veries of modern philosophy. . 
It may be well to state, as introductory to the following 
letter, that Mr. W. H. Barlow has been a resident for some 
time in Constantinople, for the purpose of constructing a brass- 
foundery and boring-apparatus, upon a large scale, with a 
view of remodelling the Turkish artillery; and thet on the re- 
turn of Namik Pasha from this country, (who had examined 
with a scrutinizing eye many of our manufacturing and scien- 
tific establishments, ) Halil Pasha, the sultan’s son-in-law, sent 
for Mr. Barlow, and spoke to him on the subject of restoring 
some dilapidated lighthouses in the Black Sea, and requested 
to know if he was acquainted with a very remarkable light 
which was known in England under the name of Drum- 
mond’s lamp. He was answered that he knew of it generally, 
and that if he could find any description of it in any of his 
books, he would furnish him with the particulars. Fortunately, 
on referring to an ingenious Armenian physician, Dr. Zohrab, 
who had studied at Edinburgh, he fell upon a number of the 
Nautical Gazette in which an account was given of the light, 
and on the ground of the information thus obtained the ex- 
periments detailed in the following letter were undertaken. _ 
I am, dear Sirs, yours very truly, 
Peter Bartow. 
Letter to Peter Barlow, Esq. 
Constantinople, Jan. 6, 1836. 
** T have already informed you of my first experiments on 
Drummond’s light, and the astonishment it produced in the 
