[FOR THE USE OF MEMBERS. |] 
Royal Justitution of Great Brita, 
1852. 
WEEKLY EVENING MEETING, 
Friday, March 26. 
Sir Joun P. Borieau, Bart., F.R.S., Vice-President, 
in the Chair. 
Proressor E. Cowper, 
On the Principles of the Construction and Security of Locks. 
Proressor Cowper, after pointing out the peculiarities of construc- 
tion in the more celebrated Locks of ancient and madern times, 
explained the mode by which Mr. Hobbs had succeeded in picking 
Bramah’s, and other locks, and suggested additional means of 
security against such a procedure. His remarks were elucidated by 
numerous large models and diagrams. 
Long continued illness has unfortunately prevented Professor 
Cowper from supplying an abstract of his discourse. 
In the Library were Exhibited : — 
Wooden Lock and Key made by the negroes of Jamaica, and another 
of a different form — Lock of wicket of the Castle of Pown- 
ghur — Key found in the thatch of an old house, St. Andrew’s.— 
Profile of General Wolfe sketched in pencil by Harvey Smith, 
one of his Aide-de-Camps, a short time before his death at 
Quebec, — from the United Service Institution. 
Wire Models to illustrate the Cleavage of the Diamond, &c. — and 
Large Pieces of Topaz Rock and Crystal of Beryl. [Exhibited 
by Mr. Tennant. ] 
Portrait on copper of Maurice of Nassau, probably by Mirevelt. 
{Exhibited by John Hicks, Esq. M.R.I.] 
Bust of Thomas Carlyle, Esq. by H. Weigall, Esq. 
Specimens of Printing in Colours by Blocks, by Messrs. C. B. and 
G. Leighton. 
Design of Galloway’s Tubular Boiler as adapted to Steam-boat 
purposes, by Mr. R. Armstrong. 
A Set of Talbotype Apparatus ; the Camera with improved Sliding 
Front — Talbotype, Negative and Positive, and various Por- 
traits, by Mr. Henneman. 
Boxes, and other Articles manufactured from Muslin and Cotton 
Mache, by Mr. G. Hart. 
Paintings on China. (Exhibited by W. T. Copeland, Esq.] 
No. 11. N 
