A Lever of such a Length and Weight will probably answer every Intention, as no sudden Blows will be required to fasten or extract it.
The occasional Tub, Tube, Plug, and Staff, shoud be fashioned after this Model.
345. The Price of the Iron and Vitriol for Inflation.
| 2000lb. of Iron Filings or Borings[116] delivered on the Spot, at 6s. a Hundred, | £. 6 | 0 | 0 |
| 16 Bottles of Vitriol, at an Average 38s. a Bottle | 30 | 8 | 0 |
| Concomitant Expences, | 3 | 12 | 0 |
——— | |||
£. Total | 40 | 0 | 0 |
Observation 1. A great Saving might be made by conducting the Process in a different Manner.
The Author making two Journies to Manchester, purposely to observe the Process by Mr. Sadler; found that his Balloon was inflated in two Hours each Time; by Means only of the two smaller identical fermenting Vessels which Mr. Lunardi afterwards purchased; but the Levity procured by the former, tho’ he also expended 16 Bottles, was by no Means so great as that gained with the Assistance of the great Vessel.
It has likewise been remarked by the Author, who has made several Experiments to this End, that the Vessels always continued in Fermentation and Ebullition, with a quick Pulsation, for at least 24, and commonly during 48 Hours, after the Inflation was completed.
And, that not more than the Depth of half an Inch of Filings had been calcined during the Operation: the rest being perfectly bright, and untouched by the Acid.
Observation. 2. If therefore one Inch in Depth of Filings, be spread over the Bottom of each of the smaller Vessels only; the proper Quantity of Water poured in; and not more than two Bottles of Acid used at once, in each Vessel; also, as soon as the Fermentation begins to decline; other two Bottles, and a proportionable Supply of Water be added; if suffered to work double, triple, or quadruple the Time;—the Inflation will be as great, if not greater, for Instance, in six Hours with eight Bottles, and two small Tubs, as it woud in three Hours, with 16 Bottles, in the same Vessels.
The small conducting Tin Tubes ought instead of four and a half, to be nine Inches Diameter: by which Means there will be no violent Pressure of Gass to endanger the Bursting of the Vessels: particularly if the Gass is not suffered to descend; but, on the contrary, according to Instructions already given, either to rise, or move, in an horizontal Direction, past the Evàcuatory, into the Balloon.