A door chain, security chain, or security door chain consists of a small chain attached to the door frame, which attaches to a track on the door for security purposes. It is a type of lock that is often used along with other types of locks to secure a door.
Read more about Door Chain: Uses, Advantages, Disadvantages, Improvements, Alternatives
Famous quotes containing the words door and/or chain:
“And we passed to the end of a vista,
But were stopped by the door of a tomb—
By the door of a legended tomb;
And I said—” What is written, sweet sister,
On the door of this legended tomb?”
She replied—”Ulalume—Ulalume!—
‘Tis the vault of thy lost Ulalume!””
—Edgar Allan Poe (1809–1849)
“The conclusion suggested by these arguments might be called the paradox of theorizing. It asserts that if the terms and the general principles of a scientific theory serve their purpose, i. e., if they establish the definite connections among observable phenomena, then they can be dispensed with since any chain of laws and interpretive statements establishing such a connection should then be replaceable by a law which directly links observational antecedents to observational consequents.”
—C.G. (Carl Gustav)