Mr. Mackain on Extinguishing Fires. 13 



Tablk II. — Melting Points of various Mktallu&oic Products, Continued, 



Melting 



100 by weight of this substance point 



Name of the substance, the melting point melt in the same temperature deduced 



of which ia determined. and in the same time to a by oal- 



globule as alloys of culation. 



b. Dark grey, slight vitreous lustre, . . 82 — +18 — = 1360" 



c. Light grey colour, sUght vitreous lu8- ) _ 



tre, (Hot blast,) i^ - + 1/ _ _ itf« 



d. Dark grey vitreous lustre, slight, (Hot) g2 _ . jg — = 1360» 

 blast,) ) 



e. Dark grey, vitreous lustre, .... 83 — +17 — = 1346» 



f. Grey and blue striped, and vitreous) looio 

 fracture, 3 



g. Dark grey, slight vitreous lustre, . . 83 — +17 — = 1345° 

 h. Same, Hot blast, 83 — +17 — = 1345' 



Copper Slags, Raw Metal, 83 — +17 — = 1345° 



Tin Slags, Pure \ _ . -« 



Block, vitreous lustre, . . . ./^ - + ^^ " - ^^" 

 Iron Slag, Blast furnace, going on No. 4 Iron, 



Slags, greenish coloured vitreous fracture, 80 — +20 — » 1388* 

 Iron Slag, Puddling, 



Iron, black colour, metallic lustre, slight, . 77 — +23 -— = 1431' 



I5th December, 1841, — The President in the Chair. 



The following members were admitted: — Thomas Lindsay, Esq., 

 William Lowe, Esq., J. G. Fleming, M.D., John Clugston, Esq., 

 George Rich, Esq. 



The following communications were read; — 



III. On the Means of Extinguishing Fires in Factories, 

 By J). Mackain, M.LC.E. 



The extensive fires that have lately occurred in two of the largest fac- 

 tories in this city have had their origin in the upper floors of the build- 

 ings. In one case, the fire began while the people were at work, and when 

 the command of a very small quantity of water would have been sufli- 

 cient to have extinguished it. In the other case, the fire began at night 



As the greater number of factories have cisterns of considerable 

 capacity placed above the engine house, and at a height of about 

 thirty feet from the ground, they could easily, and at a small cost 

 provide themselves with the means of extinguishing fire in any part of 

 their buildings, by adopting a modification of the apparatus most com- 

 monly known by the name of the Chemnitz, or Hungarian Machine. 

 A sketch of the proposed mode of applying this apparatus is here given. 



Below the cistern of the engine house, let there be placed an upper 

 receiver, or, as it is termed in the sketch, a water vessel, formed of 

 boiler plates. A pipe, a, i, having a curved end fitted with a valve, b, 

 communicates between the cistern and the water vessel 



