The very existence of the concern depends upon (1) the daily checking of the meter returns, and comparison with the output from the air compressors, so as to ascertain the amount of leakage; (2) facility for tracing the locality of a leak; and (3) easy access to the mains with the minimum of disturbance to the streets.

If structural timbers are seasoned slowly, in order to avoid excessive checking, there should be an increase in their strength.

There came a yell of welcome from Bertie at the wheel and the instant checking of the motor.

It dries better and more easily than heartwood, usually with less shrinkage and little checking or honeycombing.