Defcripiien of lh< Ma(^int far kneading Dough, t^t 



Judging from the rapidity with which the gafes were extricated, folution of pot-a(h 

 would feem to be a better conduftor than water, water a better conduftor than folution of 

 ammoniac, and folution of ammoniac, better than either of the three mineral acids. Pof- 

 fibly phofphoric acid, and other acids, may be decompofed when cxpofed to nafcent hy- 

 drogen, produced under the galvanic influence. If die ratio between the quantities of the 

 oxygen and hydrogen produced from the different wires, be always the fame, whatever 

 fubftances are held in folution by the water connefted with them, this nafcent hydrogen 

 will become a powerful and accurate inflrument of anaJyfis. 



VIII. 



Difcripticn of tht Machine for kneading Dough, mhicA is made life of in the Public Baie- 

 Houfes of Genoa j from a Model pre fented to the Patriotic Society of Milan *. 



jL he drawings in Plate XII. reprefent the machine for kneading^ the parts being re- 

 gularly numbered, i, A wooden frame upon which the gudgeon of the arbor of the 

 wheel is fupported. 2. A ftrong wall of three and a half palms f thick, through which 

 the arbor pafles. 3. Another wall of the fame kind at the diftance of ai palms. 4. The 

 arbor, 30 palms long, and ij- palms thick. 5. A large wheel turning on the arbor. Its 

 diameter is 28 palms, and its width for adimitting two men is 5 pounds. 6. Steps within 

 the wheel to afford foot hole for the men. They are ^ of a palm high, and 2 palms afun- 

 der. 7. A concrete cog wheel near the end of the arbor, and of the diameter 12^ palms. 

 8. A bar or beam of wood parallel to the arbor, proceeding from one wall to the other, 41 

 palms in length, and i{- in thicknefs. 9. Another beam of the fame dimenfions not -vi- 

 fible, becaufe on the oppofite fide of the arbor; but its relative fituation maybe feen in the 

 ftiadow upon the wall. 10. A crofs piece near the wall 3, which connefts the two pieces 

 8 together, and fupports the extremity of the arbor. Its length is 14 palms, and its thidi- 

 75efs ly. II. Another crofs piece of the fame defcription near the firft wall, but not-vi- 

 fible on account of the interpofition of that wall. 12. A ftrong curved piece attached to 

 the pieces 8, 9. It receives the pivot of the upright arbor, which carries the lantern 

 pinion and kneaders. Its clear length is .14 palms, and its thicknefs if palms. 13. The 

 lantern pinion, in diameter i;' palms, and lieight i|-, 14, The arbor to which is affixed a 

 ftrong crofs of wood. 15. The crofs formed of two bars of wood unequally divided, in 

 fuch a manner as that the four branches are of unequal lengths. They are i palm wide, 

 and -xV of a palm thick. 16. Four wooden pieces or kneaders of a triangular form, fixed 



* From the Italian of the Atti delta Soc'ieta Patrktica 4i Milam, Ftl.' II. 



t The Genoete palm, which is ftated by Dodfon, in his Calculator, 319,730, Pai-js fo*. indfes of our 



meafure. 



Vol. IV. — Septembi-r i8oa Oo ia 



