april—sept. 1859.] the Province of Auckland. 131 



Dundee Gas Works, March 17, 1859. 

 Analysis of Auckland Coal. 

 Produce of gas per ton of coal carbonized, 9*632 cubic feet. 

 Illuminating power of gas, 1-75. 



Durability, length of time that a 4-inch jet requires to consume 

 a cubic foot of gas, 53 minutes. 

 Specific gravity, 495. 



Produce of coke per ton, carbonized, 9J cwt. 



(Signed) John Z. Kay, 



Engineer Gas Company. 



Gas Works, Berwick, March 12, 1859. 

 New Zealand Coal. 



Gas, in cubic feet, per ton of coal, 7617. 



Coke, per ton of coal, in lbs., 1155. 



Tar and ammoniacal liquor, per ton of coal, in lbs., 571. 



Value of gas, per ton of coal, in lbs. of sperm, 384. 



One cubic foot of gas, burned in a No. 2 fishtail burner (or 

 union set), equal sperm candles, 3*12. 



Value of one cubic foot of gas, in grains of sperm, 374*40. 



Coke, trable, retains the granular structure of the coal ; dis- 

 integrates when exposed to air ; during combustion gives out little 

 heat ; and leaves a large mass of stone coloured ash ; specific gra- 

 vity, 1-471. 



( Combustible matter 39*25 



Composition. < Silica and alumina. 54*44 



( Protoxide of iron 6-31 



100- 



This coal is well adapted for the purpose of gas manufacture : 

 the quantity produced is not large, but you will observe of a high 

 quality, approaching several of the Scotch cannels in illuminating 

 power. 



The coke is of very inferior quality for heating purposes ; but 

 the quantity of iron share found in it is so great that it may pos- 

 sibly turn out to be a product of value. 



James Patterson, 



Civil Engineer. 



