Chambers's Journal of Popular Literature, Science, and Art, No. 725, November 17, 1877

Some time ago, while paying a professional visit at the house of a small tradesman in the town of B——, in the north of England, I made the acquaintance of an interesting old woman, who upon the occasion in question was nursing the tradesman's wife. There are persons, especially of the gentler sex, who will not be said Nay in their attempts to win your confidence; and such was Mrs Waters, the old lady whom I have named. We became intimate in a few minutes; and circumstances causing me to prolong my visit for several hours, I left the house as familiar with the dame's history as if I had known her for many years.
I have styled her an interesting woman. So she was. Her appearance, I grant, was not attractive. She bore no trace of beauty; neither had she refinement either of speech or manner, being somewhat brusque and hasty both in word and action; yet there was an irresistible power in the rapid glance of her large bright eyes; and although at first you might be led to believe, from the hastiness which marked all her movements as she attended to the requirements of the house and family, that she must be harsh and unfeeling in her disposition, she was really one of the kindest and most tender-hearted of women. I soon found out that she was a neighbour, and that she possessed independent means, which she had acquired by her own unaided industry; that she had also maintained an invalid husband for years, and had educated and given a profession to her only son and child.
I resolved to become better acquainted with the old dame; and as I did not scruple to put questions, I gleaned from her what shall form the subject of the present paper. Her designation as a 'knocker-up' will become plain as I proceed. In reply to an inquiry she said: 'O dear, no! I am not unwilling to tell you how I made my independency. Why should I be? An honest woman need not be afraid of anything. I made it, sir, by knocking-up; every penny of it. Ay, you may well look surprised, for I fancy you don't know what knocking-up is; or if you do, you are wondering how I could save a fortune out of such a line of action. No; I don't mean to say that I had no other way of making money. I started a shop after I began to knock up; but every penny I made by shopkeeping was spent in keeping my family; and when my son was put to business, some of my otherwise-made money went along with it; but every penny which I put by, and the income on which I now live, was got by knocking-up.