This is probably due to
the fact that the cut off valve commences closing the steam passage so
soon after steam is admitted, and in this particular does not satisfy
the requirements of a perfect valve. There is this about the engine,
that above all others of this type there has come under my notice
fewer engines of this type with a maladjustment of valves from
tampering by incompetent engineers.
* * * * *
FIRING POINTS OF VARIOUS EXPLOSIVES.
An apparatus, devised by Horsley, was used, which consisted of an iron
stand with a ring support holding a hemispherical iron vessel, in
which paraffin or tin was put. Above this was another movable support,
from which a thermometer was suspended and so adjusted that its bulb
was immersed in molten material in the iron vessel. A thin copper
cartridge case, 5/8 in. in diameter and 1-5/16 in. long, was suspended
over the bath by means of a triangle, so that the end of the case was
1 in. below the surface of the liquid. On beginning the experiment the
material in the bath was heated to just above the melting point, the
thermometer was inserted in it, and a minute quantity of the explosive
was placed in the bottom of the cartridge case.
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