door from being strained, or the glass broke, by the force applied to shut them. I have fixed several Locks, upon this new principle, which answer well; and if the invention meets with the approbation of the Society, I hope to be rewarded according to its merit,

I remain, with respect,]

SIR,

Your most obedient servant,

WILLIAM BULLOCK,

N° 6, Portland-street, Soho,

May 5, 1801.

Mr. CHARLES TAYLOR,

Description of Mr. William Bullock's improved Drawback Lock. Plate VI.

Fig. 2.

A. Is the new iron latch here affixed to an old common drawback house

lock.

B. An iron pin at one end of the latch, on which pin it is moveable.

C. A projecting part of the latch,which, when the common spring bolt D of the lock is drawn back, in the usual manner, is forced into the nick on its higher part at E, by the spring F, underneath the latch. The bolt D then remains within the

lock, until, on closing the door, the reliever G gently presses on the lock box, fixed in the common way on the door cheek; which pressure draws the projecting part C out of the nick E, and permits the end of the bolt D, by the force of the spring G, to slide into the lock box, and fasten the

door.

U 3

The

The Sum of FIFTEEN GUINEAS was this Session voted as a Bounty to Mr. THOMAS GENT, of Homerton, for a new-invented CRANE, for raising and delivering heavy Bodies. A Plate and Description are annexed, and a Model of the Machine may be seen in the Society's Repository.

SIR,

N offer of encouragement being published by the Society, to any person producing a model of an improved Machine for drawing up Ore, &c. from mines and pits; I beg leave to submit to your consideration a model of a Crane, which I hope will answer for that purpose; also for sinking Wells, clearing Canals, and raising Casks or other heavy Weights out of Cellars. I flatter myself that a Machine on the principle of this model, is calculated

better