AMERICAN INSTITUTE. 191 



hour for each burner while burning. In applications for machines 

 for the supply of factories, foundries, schools, colleges, churches 

 and hotels, it would be better to give the number of burners, and 

 the time they are in use. 



The foregoing description of the machine for private dwellings 

 will suffice for the larger sizes required for factories, colleges, 

 hotels, &c. The application of the principle is the same, its sim- 

 plicity is in all things retained, its efficiency is in nothing lessened. 

 Larger generating surface, and an economical application of the 

 heat, is secured by arranging the series of retorts in a circular 

 bed, each communicating with the same reservoir of raw material, 

 and forcing its generated gas into the same gasometer. 



The illuminating qualities of two feet of rosin oil gas, is equal 

 to that of four feet from coal. This is not only true in theory, 

 but holds good in practice. The burners for oil gas consume but 

 two feet of gas per hour, while those for burning coal consume 

 from four to eight feet per hour, under the same pressure. The 

 light from one gas burner is equal to that of sixteen sperm candles. 



To the manufacturer it is desirable as a mere matter of economy, 

 without reference to its protection from risk of fire, necessarily 

 incurred by the use of oils and candles. 



To schools, colleges, churches and hotels it provides, what in 

 the cities is considered an indispensable luxury, a good gas light. 



REPORT OF THE JUDGES ON PORTABLE GAS WORKS. 



Portable Gas Works exhibited by Saunders Coates and C. R. Wood- 

 worth Sf Co. 



Both of these parties were last year also exhibiters, and each 

 now presents material improvements over his own apparatus, as 

 then submitted. Your committee, as at present constituted, is 

 partially the same as at that time, and may therefore be permitted 

 to remark, that from want of proper explanation on the part of 

 Mr. Coates, the distinctive features claimed by him were not last 

 year made apparent to them, and hence his dissatisfaction with 

 the aAvard then made, viz, that of equal merit in the two. 



The Maryland company have now introduced the feature wherein 

 last year the machinery of Coates' differed principally from theirs, 



