ase the key. Should the key fail to act upon the bolt, it cannot be withdrawn, but the lock must be destroyed to release it.
Chubb had a detector in his lock of 1818.
2. A means of indicating that the water in a boiler has sunk below the point of safety.
See lowwater detector.
A pin, stud, or lever forming and forth on the table to spread the supply of ink evenly around it.
The arrangement was invented by Professor Cowper, and is described in his English patent of 1818.
The distributing-roller in printing-machines carries ink from the ductor-roller to the inking-roller.
To secure an even distribution, it is found necessary toe an endwise motion to the roller.
This is secured in one of two ways.
Professor Cowper's plan was to give a longitudinal motion to the axis (English patent, 1818).
Applegarth's method was to place the axis of the distributing-roller obliquely to the surface against which it moved.
It thus had a relative endwise mo- tio