vi CONTENTS. 



VIII. Account of the Experiments of Citizen Clouet on the different States of 

 Iron, and its Converfion into Caft-fteel - - P- '3' 



Concife hiftory of the fcience of fteel-making. Combinations of iron and carbone — of iron and 

 glafs — of iron, carbone and glafs — and of iron and its oxide. Report of experiments, particularly 

 thofe in which the carbone was afforded by carbonate of lime. Theoretical and general obferva- 

 tions on this method. 



Scientific News. Account of Books, &:c. - - - P- 138 



Mr. Dodd's plan for a bridge, fufficiently elevated to admit (hips above the prefent London bridge 

 Mr. Dance's furvey, by order of the city. Expofition of fafls tending to (hew how far the 

 alcent of this lofty bridge might prove inconvenient. On the Gloucefterlhirc ftrontian. Silex in 

 Dutch ru(h. Britidi Mineralogical Society. Kelly's fpherics. 



JULY 1799. 



Engravings of the following Objedts : i. Uncommon Effedts of the Rcfradion 

 of the Air at Sea. 2. A Brew-houfe Boiler and Furnace, by Count Rumford. 



I. Obfervations upon an unufual horizontal Refradtion of the Air, with Re- 

 marks on the Variations to which the lower Parts of the Atmofphere are 

 fometimes fubjeft. By the Rev. S. Vince, A.M. F.R.S. and Plumian Profeffor 

 of Aftronomy and Experimental Philofophy in the Univerfity of Cambridge. 



p. 141 



Strange appearance of (hips feen in the horizon from Ramfgate. Two images, one inverted and 

 the other ereft, befides the objeft itfelf. Calais cliffs. Theory. 



n. An Account of fome Endeavours to afcertain a Standard of Weight and 

 Meafiire. By Sir George Shuckburgh Evelyn, F.R.S. and A. S. (Continued 

 from page i©; of the prefent Volume) - - P* ''47 



Determination of the fpecilic gravity of a metallic cube and cylinder. Weight of a cubic inch of 

 water. Examination of a metallic fphere. 



III. On certain ufeful Properties of the oxygenated muriatic Acid. By the Rev. 

 Alexander John Forfyth - - - P- 15^ 



Colours brightened by oxymuriate of carbonated pota{h. Ink rendered black. Effefl on other 

 dying materials. Obfervations. Effeft of the fame fait on foap and expreffed oils. 



IV. On the Management of Fire, particularly with regard to the Conftrudtion of 

 Boilers. By Benjamin, Count of Rumford - - p. 161 



General remarks. Produftion of heat by combuftion, explained and applied to the conftruftion of 

 furnaces; Combined and radiant heat. Conduftors and non-conduftors. Cloathing, &c. Flame 

 is a hot wind. Form of boilers and furnaces. Meafure of effeft. Fuel — quantity faved. Coke, 

 pit-coal, charcoal, oak. Defcription of a brew-houfe boiler. Regulating door. 



V. Ex- 



