Improved Book-cttse Bolt. 25 Q 



above mentioned, that they had also seen the new method of 

 working chains in daily use for upwards of sixteen months, 

 and are certain, that in that way chains work much more 

 flexible than hempen ropes, and equally as safe and uniform. 

 Further certificates from Messrs. I. W. and B. Botfield, 

 lessees of Old Park iron-works, and Isaac Hawkins Browne, 

 esq. landlord of the said works, confirm Mr. Gilpin's state- 

 ment ; and further add, that the method is calculated for 

 chains of all sizes, and for machinery of every description; 

 that it is employed at their works with great success, in the 

 Working of cranes and mill machinery, and in the raising of 

 coal and ore from the mines. That his chains applied in 

 this manner are a complete substitute for ropes, and will 

 prevent those fatal accidents which too frequently occur to 

 the workmen and machinery, in the working of chains in 

 the usual way. That Mr. Gilpin's crane is also construcled 

 upon stronger and more durable principles than those in ge- 

 neral use, and completely answers its purpose. 



XL. Description of Mr. Peter Herbert's Improved 

 Book-case Bolt *< 



JL have taken the liberty of laying before the society a mo- 

 del of my invention, which I hope is sufficient to explain 

 mv intention. I intended it for a library book^-case bolt, to 

 facilitate the opening of both doors at once, and to secure 

 the same, without the trouble of bolting iwo bolts in the 

 common way. It will do for wardrobes, French casements, 

 or folding sash doors. It will also make a good sash fast- 

 ening, if let into the bottom sash, with a small brass knob 

 to slide as common ; it would bolt in the frame by the side 

 of the sash cord, both sides at once. I can also make it to 

 answer sundry other useful purposes if required. 

 1 remain, Sir, 



Vuur obedient humble servant, 

 No 33, Bow-streft, CoVent-gardeu. PETER HERBERT. 



* Fnim Transaction* of Iht 81 , ?<c. 1S0G. — Ten g'u'inra? were 



VflteJ i" * ; ;. Herbert for this invention, :i model oi whish it preserved in 

 iety'i Repository, 



K - Reference 



