class="sig">THE AUTHOR.

March 1, 1818.

GENERAL

OBSERVATIONS.

In pointing out the method of forming the Fulminating objects I have endeavoured to be as explicit as possible; and I feel a confidence that every necessary information is here contained.

The reason why I sometimes mention Fulminating Silver, and at others preface it by Brugnatelli's, is, that there are two kinds: one sold under the name of Fulminating Silver, the other called Brugnatelli's Fulminating Silver. The quantities here directed for each object must be strictly adhered to, as it is of too dangerous a nature to be increased in quantity, without the risk of accident. I must also beg great care will be observed in handling it, both before and after the objects are manufactured: with a trifling degree of caution, no accident can possibly occur; all that is required is to avoid heat and friction, as either in excess produces instant detonation. It is also necessary to guard against exploding the objects near the eyes; these precautions observed, no danger need be apprehended.

The best place to purchase the principal materials are the undermentioned places: for the Fulminating Silver, and Brugnatelli's Ditto, is Messrs. Accum and Garden, Old Compton-Street, London, and every other Manufacturing Chemist; the glass globes, of all sizes, are to be had of F. Pastorelli, Barometer and Thermometer Manufacturer, No. 4, Cross-Street, Hatton-Garden, London. The spiders are to be had of most glass blowers—for the cards, &c. every one is aware where to apply.

The glass composition is made as follows: take one ounce of gum arabic, and dissolve it in a quarter of a pint of water, boil it till tolerably thick, and then add as much coarse powdered glass as will form a very thick composition.

N.B. When the glass composition cannot be conveniently obtained, glass paper may be used, pasted in the same way as directed for the composition.

COMPLETE ART, &c.

THE LACE,

Or Girt of Security.

The Lace or Girt is made of strong brace-web, after the manner and size of the paper pattern enclosed; the parts marked with ink are to be covered with the glass composition, to be laid on tolerably thick—say the thickness of a three shilling piece, and about an eighth of an inch broad in each place; let it remain until quite dry, and then sew it in like manner as the pattern, and from one to one grain and a half of Fulminating Silver to be enclosed in the part marked S; a piece of paper or silk well pasted on one side is then to be wrapped twice round in the same manner as the paper in the pattern is pinned; a strong lace-hole is then to be worked at each end—the manner of applying it is to hang it on two hooks, one on the door post, and the other on the door, taking care to place the part in such a position as to come in contact with the edge of the door, on its being opened, which will cause an immediate explosion louder than a musket. Hooks may also be placed on windows or shutters, and the Lace being hung on them will produce the same effect: a greater safeguard against midnight intruders has never been discovered.

FULMINATING

LETTERS.

The letter inclosed is a pattern of the manner in which they are put together, an examination of which will give the true idea to every attentive observer: a sheet of paper should be used doubled, and cut according to pattern; two slips of parchment must be used instead of those of paper, as enclosed in the pattern letter. The ends marked with Ink must be slightly covered with glass composition, and about an eighth of an inch wide, they must then be laid separately to dry, and when quite dry they must be sewn at one edge as shewn in the pattern, you must then put one third of a grain of Brugnatelli's Fulminating Silver in