It was only a kind of safety-valve by which the detective let off his superfluous steam.
The boiler is shown at A and the safety-valve and filler at L.
The safety-valve and filling plug are both shown in Fig. 51.
It was a safety-valve which had worked satisfactorily at the right moment.
It is impossible to over-estimate the value of this safety-valve.
Without some such plan the Empire will have no safety-valve in South Africa.
A woman thinks you can get rid of steam by boxing it up and sitting on the safety-valve.
"If it's a safety-valve, it's all very well," replied her cousin.
Their voices, trained to battle with the tempest, formed a safety-valve to their feelings.
Instead of being a blight, it may be just a safety-valve which works for the good of the world.