1803.1 



New Patents lately enrolled. 



247 



and their jndicials oppofife to them ; fub- 

 trail the fiid indicial 3 from the plenary 

 number 10, and 7 remain, to which add 

 the indicial 5=112; but as ii is more 

 than its plenary number 9, the 9 muft be 

 fubtraSed from it, <vhich leaves 3 ; mul- 

 tiply the plenary 10 by 3=30; fubtraft 

 the remainder 7 and 23 will be the num- 

 ber fought. This rule will anfwer For 

 any two confequtnt numbers ; 01 if there 

 are two points, one at the plenary 10, 

 another at the plenary 9, they will fcpa- 

 rate, and coincide by 90 impulfes, a.< each 

 of which the point g will have aiivanced 

 on the wheel 10, ^oth part ot its cir 

 cumfrrfnce, fo that it one of the wheels 

 is graduated with 90 points, and any 

 hand or other pomter is faftmed with, or 

 formed out of the other wheel, each im- 

 pulfe will be defignited thereby. If the 

 index is for afcertainins time or diftance, 

 a focket may come through the under 

 wheel, and a h^rd may be fixt-d upon it 

 to travtrfe either upon ilie upper wlieel, 

 or upon a diai plate, fixed there-o, gradu- 

 ated with any portions of time ordiftance. 

 Again let there be two odd numbers, dif- 

 fering by 2, as u and 9, any how equally 

 impelled from the points at their plenary 

 numbers, and indicials 3 and 7 are found 

 at Certain points on the fissure. Here 15 

 being greater than the plenary 9, r.ine 

 mult be (ubtrafled, and as the difFercnce 

 between the plenary number is 2, the re- 

 mainder 6 nniif he diviiled by 2=:3, and 

 3X If — ?=:25 the number fought. This 

 rule will aniwer for any two conflquent 

 odd number?. ■" 



Mr. S. gives other indances in his fpe- 

 citication, and he fays th^t his rules in 

 their application are fo ealy that a child 

 of eleven years old may aniwer any quef- 

 tion leiati^e to the cimhina: ions cxi en. ting 

 ;o 999900 almoft as loon as ilie fieures 

 can be written down. The advantages of 

 this mode of counting are the Im ill tx- 

 pence of tile intrumtnts, and that every 

 impulfe is defignated without irailional 

 parts. 



A peciiliaritv which diftinguiftics thefe 

 numerical indexes is that L* ute haiuJ of a 

 CDuiitin:;-tngine moves over a circle of 10 

 which fignifies 1000, another over a cir- 

 cle of 10 which fignirtes 100, and an- 

 other' of 10 which cxprtflcs units, the 

 pointrr in the circle at 1000 is piogreffing 

 a fradion of ^o'so^^" P*"^' ^l' ''^ (;.rcle at 

 every impulfe, and the ha-.d in the circle 

 of 100, yj-^tli part, which occasions much 

 iinctr:ainty in extcniive counting when 



the engine has been a little time in ufe ; for 

 the pointers in the different circles will 

 not exaflly coincide at their whole num- 

 bers. The endlefs variety in which the 

 combination wheels may be put in motion 

 by conneifed and intermediate powers are 

 obvious to every mechanic, neverthelefs 

 Mr. S. has given fome contrivance*, the 

 ufe of which he recommends, but for the 

 defcription of their ufe we mult refer ta 

 the fiecificatii-n itfclf. 



Another part of the invention confifts in 

 ce-tain modt-s of giving motion, at the 

 eni\ of every revolution of oae wheel, ti» 

 a tooth m another wheel, upon the fame 

 axis. The combination may fometimes 

 confifl of four numbers as fit 13, n, io> 

 9. , Find the number f>uglu for 11, 10, 

 and 9 as i-, direiited in another part of the 

 fpecification ; fuppole the number to be 

 829, divide it by 13, the remainder is 5, 

 and let 3 be the number at which 13 i» 



found, thtn =: and 8 — 3^:3 and 



2 



5X11X10X9 + 87-9=3799. Thecom- 

 bination whceU will extend to various 

 ufeUil ptirpol'es, as wind-gages, reels, and 

 the menfuremeut of cloth, &c. and where 

 regular motions can be obtained from 

 fand or water, time pieces may be con- 

 (frufted upon this principle. The ar- 

 rangement for the particulir puipofe of 

 fuiveying is a combination of a fliy and 

 wheel, which Mr. S. calls a geographer. 

 The pole of the wheel is fuppc-ied by a 

 fwiv^l, which has a horiz n-al m 'tion 

 within a focket at the end of the pole, and 

 a perpendicular one on its own axis. The 

 a Wantage »f this over the perambulator is, 

 that it in:iy be driwn by a lioi lir, aid that 

 the furveyor may ride in the (eat fixed 

 upon t.ie pole. If the wheel is ten feel: 

 in diameter, and afls by a crank on its 

 axis, upon the nvimerical iudex, the num- 

 bers reprelented on it will be the number 

 of feet by adding a cypher to (he end 

 of it. 



MR. THOMAS BARNETT'«, (laM- 



EETh), for an htvention, ivhereh,' a re- 

 qui/ife Suantity of Aif ivouLl iniroduci 

 iijelf into any Vejfil containing Fluids, or 

 afufyer-abundani ^luuntitj 0/ Air therein 

 difcharge jtfelf, jo as to prcfcrnje the 

 Fluid in a co/ijlant State for Upj, (Sjc. 

 Mr. Barnett's uiventioo conliHs of a 

 tube, I' hich may be made of glais, (arthei- 

 ware, brals, coj'pcr, or any metal or mi- 



terial 



