. Commercium philosophico-technicum; or, The philosophical commerce of arts: designed as an attempt to improve arts, trades, and manufactures . belongs 620 Method of preparing ruby glafs and enamel with gold — 621, ^lantity of gold collected in rivers 622. ISource of the gold found in rivers 623 Gold coloured metal from copper and tin 62 \.. Gold coloured varnifh 624. Rcolifcation offpirit for varnijhes 625 <irold coloured glafs with metallic fubftances 626 Tellow glafs with earths 627 Tellow, &c. glafs with inflammable matter 628. Of the converfion of green glafs into porcelain 630 ^ Of th
. Commercium philosophico-technicum; or, The philosophical commerce of arts: designed as an attempt to improve arts, trades, and manufactures . belongs 620 Method of preparing ruby glafs and enamel with gold — 621, ^lantity of gold collected in rivers 622. ISource of the gold found in rivers 623 Gold coloured metal from copper and tin 62 \.. Gold coloured varnifh 624. Rcolifcation offpirit for varnijhes 625 <irold coloured glafs with metallic fubftances 626 Tellow glafs with earths 627 Tellow, &c. glafs with inflammable matter 628. Of the converfion of green glafs into porcelain 630 ^ Of the machines for bloiving air by a fall of water 631 Of conJiruSiing blowing machines with falls of water of great height —— 6-^2 C c Off T The C O N T E N T S. Page Of conftruEiing blmving ynachmes for loiv falls —— 635 Explanation of the flate --— 637 Black Diamond -< —~ 637 Indian ink from lamp-black and glue 638 Black varnifti for metals 639 Separation of the alcali of fea fait —- —- 639 1. Purification offeafalt -—- 639 2. Preparation of cubic nitre 642 3. Separation of the mineral akalifrom cubic nitre 645. C O M- ERRATA. Page 89, lint 10,11. for two p»rts of tin and three of gold, read two parts of gold acd three of ^t 556, line lo/rm tie hum, for 87 parts readf^-] parts. ^ ^ COMMERCIUM Philosophico-technicum. I. Defcription of a Portable Furnace formaking experiments* PORTABLE furnaces have been generally contrived,not only with a view to the purpofes of experi-ment, but lik-ewife for anfwering in fome degree thedemands of buiinefs. As the fize, which procures them thislaft advantage, renders them lefs fit for the firft and prin-cipal intention j I have long endeavoured to contrive amore manageable, as well as \t(% expenfive furnace, forexperimental enquiries; and to bring thefe kinds of inflru-ments as near as may be, in regard to the facility andthe conveniency of their ufe, to the flime footing with theair-pump, the condenfing engine, and
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Keywords: ., bookauthorlewiswilliam17081781, bookidcommerciumph, bookyear1763
