186 Security against House-breakers . 
ed to prevent the pannels of shutters or doors being cut 
out by house-breakers ; and having tried a great number 
of experiments, I have at length succeeded in accom- 
plishing the one I have the honour of forwarding to the 
Society for the Encouragement of Arts, &c. 
This improvement consists in introducing tempered 
steel wires through the pannels and stiles at the distance 
of three inches, thereby not only making a door or shut- 
ter far superior in strength, but calculated to defy the at- 
tempts of the house-breaker in taking out a pannel. This 
improvement, though so far superior to any hitherto 
known for appearance and utility, will be attended with 
less expense. I have submitted the above plan to Messrs. 
Paynters, Coleman street, likewise to Messrs. Moffat 
and Co. Paternoster row, and to several gentlemen in 
that line of business, who all do me the honour to say, 
that it far surpasses any thing of the kind, that they have 
ever known or conceived, and that it will completely an- 
swer the purpose. 
I have also sent the machine on which I bored the 
pannel, conceiving it to be an additional recommenda- 
tion ; with this machine, a boy may with ease bore the 
shutters, &c. which otherwise might be difficult for a man 
to accomplish. — I have the pleasure most respectfully to 
subscribe myself, yours, &c. 
Joseph Davis. 
Certificate. — We hereby certify, that Mr. Davis’s 
improvement on doors and shutters, to prevent the pan- 
nels from being cut out by house-breakers, is the best that 
we have ever seen ; and we are of opinion, that its being 
known will be an advantage to the public, and do there- 
fore recommend it to the Society for the Encouragement 
