and the Economy of Fuel. 65 



As this table may be useful to others who may be 

 engaged in similar pursuits, and as the publishing of it 

 will also tend to give my reader a more perfect idea of 

 the manner in which my experiments were conducted, I 

 shall (as an example) give an account of one experiment 

 in the same form in which it was registered in one of 

 these printed tables. 



These tables, as they are printed for use (on detached 

 sheets), occupy one side of half a sheet of common folio 

 writing paper. 



Every thing in this table, except such figures and 

 words as are printed between crotchets, is contained in 

 the printed forms. Hence it is evident how much these 

 tables tend to diminish the trouble of registering the 

 results of experiments of this kind, and also to prevent 

 mistakes. 



The example I have here given is an account of 

 an experiment in which a very large quantity of water, 

 equal to 15,590 Ibs. avoirdupois in weight, or 1866 wine 

 gallons of 231 cubic inches each; but it is evident that 

 these tables answer equally well for the small quantity 

 contained by the smallest saucepan. 



The height of the barometer is expressed in Paris 

 inches ; that of the thermometer, in degrees of Fahren- 

 heit's scale. The other measures, as well of length as 

 of capacity, are the common measures of the country 

 (Bavaria); and the weight is expressed in Bavarian 

 pounds, of which 100 make 123.84 Ibs. avoirdupois. 



What is entered under the head of GENERAL RE- 

 SULTS OF THE EXPERIMENT requires no explanation; 

 but what I have called the PRECISE RESULT must be 

 explained. 



Having frequent occasion to compare the results of 



