PYROTECHNY. 



nails, then burn the leader through the middle, and both 

 will take fire at the fame time. Rockets of one pound arc a 

 good fize for this ufe. 



Illuminated fpiral Wheel. — Firfl: have a circular horizontal 

 wheel, made two feet in diameter, with a hole quite through 

 the nave ; then take three thin pieces of deal, three feet 

 long each, and three quarters of an inch broad each : one 

 end of each of thefe pieces nail to the fell of the wheel, at 

 an equal diflance from one another, and the oth"r end nail 

 to a block with a hole in its bottom, which mufl be perpen- 

 dicular with that in the block of the wheel, but not fo large. 

 The wheel being l.hus made, take a hoop planed down very 

 tliin and flat ; then nail one end of it to the fell of the wheel, 

 and wind it round the three flicks in a fpiral line, from the 

 wheel to the block at top : on the top of this block fix a 

 cafe of Chinefe fire ; on the wheel you may place any num- 

 ber of cafes, which mufl incline downwards, and burn two 

 at a time. If the wheel fliould confift of ten cafes, you 

 may let the illuminations and Chinefe fire begin with the fe- 

 cond cafes. The fpindle for this wheel mull be a little 

 longer than the cone, and made very fmooth at top, on 

 which the upper block is to turn, and the whole weight of 

 tlie wlieel to reft. See Jig. 1 1 . 



Fruilont Wheels. — Firll take a nave, made nine inches 

 long, and three in diameter : near the bottom of this nave 

 fix eight fpokes, with a hole in the end of each, large enough 

 to receive a two or four-ounce cafe : each of thefe fpokes 

 may be fourteen inches long from the block. Near the top 

 of this block fix eight more of the fame fpokes, exaftly over 

 the others, but not fo long by two inches. As this wheel is 

 to run horizontally, all the cafes in the fpokes at top muft 

 play obliquely upwards, and all of them in the fpokes at 

 bottom obliquely downwards. This being done, take a 

 fmall horizontal wheel, made with eight fpokes, each 

 five inches long from the block ; on the top of this 

 wheel place a cafe of brilliant lire : all the cafes on this 

 wheel mufl play in an oblique diredlion downwards, and 

 burn two at a time, and thole on the large wheel four at a 

 time ; that is, two of thofe in the top fet of fpokes, and 

 two of them in the bottom fet of fpokes. The four firfl 

 cafes on the large wheel, and the two firfl on the fmall, muft 

 be fired at the fame time, and the brilliant fire at top, at the 

 beginning of the laft cafes. The cafes of the wheels may 

 be filled with a grey charge. When thefe wheels are com- 

 pleted, you mufl have a Itrong iron fpindle, made four feet 

 fix inches long, and fixed perpendicular on the top of a 

 ftand : on this put the large wheel, whofe nave muft have a 

 hole quite through, from the bottom to the top. This 

 hole muft be large enough to turn eafy round the bottom of 

 the fpindle, at which place there mufl be a fhoulder, to 

 keep the wlieel from touching the ftand : at the top of the 

 fpindle put the fmall wheel, and join it to a large one with a 

 leader, in order to fire them both together. 



IHuwlnated Globes, tvith horizontal Wheels. — The hoops 

 for tliefe globes may be made of wood, tin, or iron wire, 

 about two feet in diameter. For a fingle globe take two 

 hoops, and tie them together, one within the other, at right 

 angles ; then have a horizontal wheel made, whofe diameter 

 mufl be a little wider than the globe, and its nave fix inches 

 long, on the top of which the globe is fixed, fo as to ftand 

 three or four inches from the wheel : on this wheel you may 

 put any number of cafes,, filled with what charge you like ; 

 but let two of them burn at a time : they may be placed 

 horizontally, or to incline downwards, juft as you choofe. 

 Now, when the wheel is clothed, fix on the hoops as many 

 illuminations as will ftand within two inches and a half of each 

 other : thefe you faften on the hoops with fmall iron binding 



wire ; and when they are all on, put on your pipes of com- 

 munication, which muft be fo m/naged as to light them all 

 with the fecond or third cafe on the wheel. The fpindle 

 on which the globe is to run muft go through the block of 

 the wheel, up to the infide of the top of the globe, where 

 muft be fixed a bit of brafs or iron, with a hole in it to re- 

 ceive the pomt of the fpindle, on which the whole weight of 

 the wheel is to bear, as in_^. 12, which reprefents a globe 

 on its fpindle. By this method may be made a crown, which 

 is done by having the hoops bent in the form of a crown. 

 Sometimes globes and crowns are ordered foasto ftand ftill, 

 and the wheel only to turn round ; but when you would 

 have the globe or crown to Hand flill, and the wheel to run 

 by itfelf, the block of the wheel mufl not be fo long, nor 

 the fpindle any longer, than to jufl raife the globe a little 

 above the wlieel, and the wheel-cafes and illumination muft 

 begin together. 



Dodecahedron, fo called becaufe it nearly reprefents a 

 twelve-fided figure, and is made thus. Firft take a ball, 

 turned out of fome hard wood, fourteen inches in diameter : 

 when done, divide its furface into fourteen equal parts, from 

 which bore lioles an inch and a half in diameter perpen- 

 dicular to the centre, fo that they may all meet in the mid- 

 dle : then let thei-e be turned in the infide of each hole a 

 female fcrew ; and to all the holes, but one, muft be made a 

 round fpoke, five feetlong, with four inches of the fcrew atone 

 end, to fit the holes ; then in the fcrew end of all the fpokes 

 bore a hole, five inches up, which muft be bored flanting, fo 

 as to come out at one fide, a little above the fcrew ; from 

 which cut a fmall groove along the fpoke, within fix inches 

 of the other end, where you make another hole through to 

 the other fide of the fpoke : in this end fix a fpindle, on 

 which put a fmall wheel, of three or four fides, each fide fix 

 or feven inches long : thefe fides muft have grooves cut in 

 them, large enough to receive a two or four-ounce cafe : 

 when thefe wheels are clothed, put them on the fpindles, 

 and at the end of each fpindle put a nut, to keep the wheel 

 from falling off : the wheels being thus fixed, carry a pipe 

 from the mouth of the firfl cafe on each wheel, through the 

 hole in the fide of the fpoke, and from thence along the 

 groove, and through the other hole, fo as to hang out at 

 the fcrew end about an inch. The fpokes being all prepared 

 in this manner, you muft have a poft, on which you intend to 

 fire the work, with an iron fcrew in the top of it, to fit one 

 of the holes in the ball : on this fcrew fix the ball ; then in 

 the top hole of the ball put a little meal powder, and fome 

 loofe quick-match ; then fcrew in all the fpokes, and in one 

 fide of the ball bore a hole, in which put a leader, and fecure 

 it at the end ; and your work will be ready to be fired. By 

 this leader the powder and match in the centre are fired, which 

 will light the match at the ends of the fpokes all at once, 

 whereby all the wheels will be lighted at once. There may 

 be an addition to this piece, by fixing a fmall globe on each 

 wheel, or one on the top wheel only. A grey charge will 

 be proper for the wheel-cafes. 



Tetu-tree of briUiant Fire, is reprefented hjjig. 1 3, as it 

 appears when burning. Firft, let A be an upright piece of 

 wood, four feet long, two inches broad, and one thick ; at 

 top of this piece, on the flat fide, fix a hoop, fourteen inches 

 in diameter ; and round its edge and front place illuminations, 

 and in the centre a five-pointed ftar ; then at E, which is 

 one foot and a half from the edge of the hoop, place two 

 cafes of brilliant fire, one on each fide : thefe cafes fhould 

 be one foot long each : below thefe fix two more cafes of 

 the fame fize, and at fuch a diftance, that their mouths may 

 almoft meet them at top : then, clofe to the ends of thefe 

 cafes, fix two more of the fame cafes ; they muft ftand pa. 

 N 2 rallel 



