lupton: safety lamps. 
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itself in five minutes; under the same pressure the Morgan Lamp 
exploded in two minutes thirty-eight seconds. 
Fleuss. This lamp is only for exploring mines full of gas. It 
is enclosed in a glass case, it burns spirit, and oxygen is supplied 
under pressure. The products of combustion escape through water. 
Unless it is broken it is quite safe. 
The Mackinless Lamp has perforated brass plates instead of 
gauze, and has a Mueseler chimney. 
In conclusion, let me sum up the results of our enquires : — 
The lamp of the future will be one of the following : — 
(1.) Electric Secondary Battery (Swan's). 
(2.) „ Primary 
(3.) Bonnetted Three Gauze (Marsaut). 
(4.) „ „ „ (Mueseler). 
(5.) Inorgan Three Gauge (Mueseler). 
(6.) Clifford, if it stands official tests as well as Mr. Clifford 
claims for it. 
(7.) I understand the Mackinless lamp has not been 
exploded. 
These lamps give light, which is what we want, and they are, so 
far as testing can prove them, safe (except the last, which is new, and 
for which I only give the inventor's authority). 
All lamp cabins must be on the surface, and have enough 
delivering windows for the delivery of lamps to the men at a rate 
not exceeding 120 lamps per hour at each window, so that each man 
may see his lamp put together. The diagram shows a sketch plan of 
such a cabin. (See fig. 14.) 
Without some such careful arrangement of lamp rooms the new 
lamps will prove worse than the old, but with due care they will 
prove much better. 
I have said enough, however, to show how very carefully changes 
must be made, to prove how blind all legislation is likely to be. 
Lamps will be improved, but not by law. In these days of invention 
a law on mechanical questions is always antiquated by the time it is 
passed, and it hampers and discourages invention. 
