1882.] On the Influence of Coal-dust in Colliery Explosions. 443 



together and the supports on which the sections rest are also shown. 

 In section (a) the door is open, in (&) it is shut. 



All important details concerning each experiment will be found in 

 the following table : — 



Details of Sixty-three Experiments made at Lluyuypia Colliery, 

 between the 14th and 21st of July, 1881. 



Date. 







4) 



Length of the gallery 

 strewed with coal-dust. 



Position and weight 

 of heaps of 



Distance travelled by 

 the flame. 





to 

 g 



s 













gunpowder. 

















a 





























°-6 



u 



























O 



23 >» 



a 











y 

 33 





H 







g£ 



ai 



July, 



o 



+3 o 



5a 



»a 



Sections with 



Sections with 



a> 

 a 



Distance frc 

 diaphragm. 



3 

 ,a 



<a 

 "S 







§ 



1881 



; Number 



Total qui 

 damp em 



Sheets of 

 diaphrag 



doors shut. 



doors open. 



Weight i 

 heap. 



Whether 

 or not. 



In the cl« 

 part of 1 

 gallery. 



In the op 

 part of tl 

 gallery. 



Beyond t 

 of the ga 



Total dist 







Cb. ft. 



No. 



No. 



Ft. 



No. 



Ft. 



Oz. 



Ft. 





Ft. 



Ft 



Ft. 



Ft. 



14 



" 



" 

 »> 

 " 

 " 



" 



2 

 3 

 4. 

 5 

 g 

 7 

 8 

 9 

 10 

 11 

 12 



1 '811 

 1 "81 1 

 1 811 

 1 811 

 1 *811 

 1 '811 

 1-811 

 1-811 

 1-811 

 1-811 

 1-811 

 1-811 



4 



g 



g 

 g 

 g 

 g 

 6 

 6 

 6 

 6 

 6 

 6 

















16 

 14 



12 



15 



15 



151 



11 



12 



l ni 



Q 



10 





I0 i+ 

 9 



10 



IDT 



14 



19 1 

 1^2 



12 



15 



15 



15| 



11 



12 





13 



1 811 



4 

















Hi 







HI 

 9 



13 



15 

 » 



14 

 15 



1-811 

 1 -811 



6 

 6 

















j 

 13 







" 



16 



1 -811 



? 



"a 



54 



"2 



36 









? 







? 





17 



1 -811 



? 



3 



54 



2 



36 









? 







9 





18 



1 -811 



? 



1 



18 



1 



18 









18 



18 





36J 





19 



1-811 



? 



2 



36 



2 



36 









36 



26 





62 





20 



1-811 



6 



3 



54 



2 



36 















? 





21 



1-811 



6 



3 



54 



2 



36 









54 



5 





59 





22 



1-811 



2 



3 



54 



2 



36 









54 







54 





23 



1-876 



6 



3 



54 



2 



36 









54 



24 





78 





24 



1-876 



6 



3 



54 



2 



36 









54 



36 





90 





25 



1-876 



6 



3 



54 



2 



36 









54 



30 





84 





26 



1-876 



6 



3 



54 



2 



36 









? 







9 





27 



1-876 



6 



3 



54 



2 



36 









54 



"4 





58 





28 



1-876 



6 



3 



54 



2 



36 









54 



27 





81 





29 



1-876 



6 



3 



54 



2 



36 









54 



38 





92 





30 



1-876 



6 



3 



54 



2 



36 









54 



32 





86 





31 



1-876 



6 



3 



54 



2 



36 









54 



44 





98^ 





32 



1-876 



6 



4 



72 



2 



36 









72 



36 





108 





33 



1-876 



6 



4 



72 



2 



36 









72 



32 





104 





34 



] -876 



6 



4 



72 



2 



36 









72 



32 





104 





35 



1-876 



6 



5 



90 



2 



36 









? 







? 





36 



1-876 



? 



5 



90 



2 



36 









90 



27 





117|| 





37 



1-876 



6 



5 



90 



2 



36 









90 



36 



"2 



128 





38 



1-876 



6 



5 



90 



2 



36 









90 



1G 





1001 





39 



1-876 



6 



5 



90 



2 



36 









90 



36 



"4 



130 





40 



1-876 



6 



6 



108 



1 



18 









108 



9 





117 



* No coal-dust, and gallery wetted in the first fifteen experiments. 



t Fan going and upwards of 1,000 cubic feet of air passing into the apparatus just behind the dia- 

 phragm until the forty-third experiment. 



t It was now recognised that the open seams in the gallery ought to be closed, and this operation 

 was effected gradually with strips of wood and canvas, &c, until the thirty-first experiment, when it 

 was completed except along the bottom and at the joints of the doors, where the seams were left open. 



§ Strips of canvas were nailed along two of the three seams in the bottom and along the joints of the 

 doors of the first two sections. Also pieces of felt were introduced between the ends of the first four 

 doors this day. 



D Fresh dust was put into the first three sections only. 



1 Before experiments were begun this day strips of canvas were nailed along all the seams in the 

 bottom and at the joints of the doors as far as the end of the sixth section. 



VOL. XXXIII. 2 K 



