Theatrum naturae et artis

...in removing massive weights, exerts itself through fulminating powder, fulminating gold, and gunpowder; of which the latter, three testing machines, [in German] Pulver proben powder testers, of different construction, are produced.

(c) Namely, how those common ones in hypocausts underfloor heating systems can be improved so that we might accomplish with half the wood what perhaps we cannot hope to achieve otherwise with double the amount. For this purpose, several furnaces of smaller form, long since put into practice, are displayed. Also, others very useful in kitchens for roasting and other bakers' purposes are shown. Mention will also be made of others suitable for melting metals and chemical operations, in which the fire descends.

(d) For example, about the method of making iron look ignited without any fire.

3. Phenomena of luminous, non-burning fire (a) worthy of sight.

(a) To pass over other things now, those are especially noted...