“Yes, sir. I am afraid that I am a little late, but I am not quite my own master, you know. I am sorry that Miss Sutherland has troubled you about this little matter, for I think it is far better not to wash linen of the sort in public. It was quite against my wishes that she came, but she is a very excitable, impulsive girl, as you may have noticed, and she is not easily controlled when she has made up her mind on a point. Of course, I did not mind you so much, as you are not connected with the official police, but it is not pleasant to have a family misfortune like this noised abroad. Besides, it is a useless expense, for how could you possibly find this Hosmer Angel?”
“It is a curious thing,” remarked Holmes, “that a typewriter has really quite as much individuality as a man’s handwriting. Unless they are quite new, no two of them write exactly alike. Some letters get more worn than others, and some wear only on one side. Now, you remark in this note of yours, Mr. Windibank, that in every case there is some little slurring over of the ‘e,’ and a slight defect in the tail of the ‘r.’ There are fourteen other characteristics, but those are the more obvious.”
“We do all our correspondence with this machine at the office, and no doubt it is a little worn,” our visitor answered, glancing keenly at Holmes with his bright little eyes.
“And now I will show you what is really a very interesting study, Mr. Windibank,” Holmes continued. “I think of writing another little monograph some of these days on the typewriter and its relation to crime. It is a subject to which I have devoted some little attention. I have here four letters which purport to come from the missing man. They are all typewritten. In each case, not only are the ‘e’s’ slurred and the ‘r’s’ tailless, but you will observe, if you care to use my magnifying lens, that the fourteen other characteristics to which I have alluded are there as well.”