An important error in Pidduck's special solution is pointed out. Special solutions for a perfect and an imperfect gas are obtained. Modifications to take account of projectile friction and the burning of the powder are given.

1.
Love
and
Pidduck
,
Phil. Trans. Roy. Soc.
222
,
222
(
1922
). Pidduck assumes the responsibility for the special solution.
2.
Pidduck gives E = (CV2/6)[1−6ε/55⋯] for γ = 11/9, which is consistent with the above.
3.
fk(x) denots the kth derivative of f(x).
4.
Reference 1, pp. 167–216.
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