Sleani- Engines. — Safely -lamp Controversy. 63 



these last, like the analogous order amoiij^ the acids, exceed the 

 others in power. When an acid and alkali unite, the hydrogen 

 of both is expended in forming water. The neutral salts, ac- 

 cording to these views, will therefore he either sur-conipounds of 

 two binary compounds, one of the radical of the acid, the other 

 of the radical of the base witli oxygen, or they are ternary com- 

 pounds of the two radicals with oxygen. The latter is tiie more 

 probable opinion. 



XIII. Intelligence and Miscellaiieoiis Articles. 



-j-y STEAM ENGIAES iN CORNWALL. 



i* ROM Messrs. Leans' Report for December ISIJ," it appears 

 that during that monCii the follon-ing was the work performed by 

 the engines reported, with each busliel of coals. 



l^oimds oJvHiter lifted Load per square 

 ifoot high roilh etich bushel, inch in cylinder. 



25 common engines averaged 22, 409, 878 various. 



Woolf's at Wheal Vor .. 29,467,621 17'2 lib. 



Ditto Wh. Abraham .. 138,812,073 16-8 



Ditto ditto .. .. 27,236,924 | 476 



Ditto Wheal Unity .. 32,265,991 } 13- 1 



Dalconth engine .. .. 39,561,904 10 6 



Wheal Abraham ditto .. 31,060,512 j 10 9 



United Mines engine .. 31,315,593 ! 17-3 



Treskirby ditto .. .. 38,187,872 I 107 



Wheal Chance ditto .. 30,535,439 j IS'l 



Erratum in November Report ;~| [ 



Woolf's engine atWheal Vor, y29,693,9 15 ! 



read . , . . . . I ' 



SAFETY- Lrt MP CONTROVERSY. 



In our Numher for December, we alluded to a Report upon 

 the Claims of Mr. George Stevenson, relative to the Invention 

 of his Safety-lamp, bv the Committee appointed at a Meeting 

 holden in Newcastle on the 1st of November 1817 j with an 

 Appendix containing the Evidence. 



In the same Number we laid before our readers the Resolu- 

 tions jjassed at a General Meeting of the Coal-owners of the 

 Tyne and Wear, held at Newcastle on the 26th of Novemlier, 

 for the pur])ose of taking into consideration certain Resolutions 

 passed at a Meeting of the friends of Mr. George Stej)henson on 

 the 1st of November, and which were inserted in our Number 

 for that month. 



The Resolutions of Mr. Stephenson's friends just alluded to, 

 are prefixed by way of Introduction to the Report of t!ie Com- 

 mittee on his claims. The Report itself occupies thirteen 8vo 

 pages, and there is added to it an Appendi.s consisting of thir- 

 teen 



