IV

The C O N T E N T 3.

V. Page

Os the blowing of air into furnaces by a fall of water 2^7

I. Account of the principal machines used for blowing air

into furnaces by a fall of water -- 270

1. A simple pipe - 270

2. A pipe with air holes, inserted into an air vessel 27 l

3. A funnel and pipe without air holes, inserted into

an air vessel - > - 272

4. A funnel and pipe with air holes, inserted into an

airvefel - ■ - ■ -- ■■ - 273

At Leadrhills in Scotland —— 273

In Dauphiny in France -- 274

In Foix in France —— 276

In Languedoc in France - 277

II. Experiments and observations for the improvement of

the foregoing machines, and for efablijhing theirprinciples of action - 279

1. Of the quantity of water they require, and the quan-

tity and force of air they a ford - 279

2. Observations on the air vefel - — 286

3. Experiments of air pasing down with water through

pipes - - - 291

Water running through a crane - 29 r

Water descending through an oblique pipe with

lateral apertures -- 293

Water falling through a funnel - 294

Water falling from a considerable height into a

funnel with a pipe - 295

Water falling from a funnel through a pipe withair holes 296

4. Experiments and observations for regulating the

JiruAure of the funnel and pipe - 298

Experiments with funnels ami pipes of different

heights 298

Experiments -of the disposition of the air holes 301Experiments of the proportional bores of the funnel

and pipe — > — - -- 303

Experiments of dividing the fream so as to increaseits eff'eAs, and render less water sufficient 304

VI.