DETECTIVE PHOTOGRAPHY.

For several years Mr. D. N. Carvalho, the New York photographer, has

made a specialty of the delicate use of photography which is brought

into play more and more in connection with criminal cases in which

disputed handwriting, forgeries, counterfeit money, etc., are features.

The results now achieved are the outcome of years of experiment, and

the photographic expert becomes in the end an expert in handwriting.

Mr. Carvalho's gallery of records is an interesting illustration of

what perseverance and ingenuity, aided by photography, can do toward

solving apparently hopeless mysteries. To a reporter, who visited his

studio, he said:

"We can do a great many things to bring the truth to light by the aid

of photography. There is scarcely a case nowadays in which it is not

brought into play if disputed handwriting is concerned. Of course the

most famous case of late years was the Morey letter case. There is a

photograph of the Morey letter up there in a corner. It yet remains a

mystery, but we are certain that Garfield did not write it. I first

found by photography that the envelope had been tampered with by the

following process: Cutting the envelope open, so as to get a single

thickness of paper, I put it between two sheets of plate glass, and

placed it where the sun passed through it, the camera being placed

on the shady side. Although no half-erased writing could be detected

on the envelope with the naked eye or a glass, the difference in the

thickness of the paper where erasures had been made showed plainly, as

the light came through more clearly, and the erased words, which gave

rise to so much discussion, were discovered.

"Below the Morey letter is a photograph of the signature of Alonzo C.

Yates. Yates, you may remember, was a rich Philadelphia clothier, who,

late in life, married a cook in the Astor House, and died, leaving a

million or so to the wife. The daughters by a first wife disputed the

signature to the will. I was employed by John D. Townsend to show the

genuineness of the signature. We got thirty or forty genuine signatures

of Yates admitted by both sides, and showed that a man never writes

his name the same way twice. Then I took the signature of the will and

another admitted by both sides, and enlarged them until each was 9 feet

4 inches long. The peculiarities of the writing became so apparent when

shown upon that enormous scale--the signatures were so evidently by the

same person--that the contestants gave up the case.

"There is a portrait of Theophilus Youngs. He married a clairvoyant

many years ago in Boston and disappeared. His widow pretended to

recognize his body in one that was found in the bay soon after, and he

was given up as dead. Some years after his father died, and the widow

put in a claim for a share of the property. The contestants, by whom

I was employed, contended that Youngs was yet alive, and eventually

produced him in court. The alleged widow refused to recognize him,

and I was called upon to prove he was the man. The widow produced

a photograph which she said was one of the pictures of Youngs, her

husband. A good many years had passed, and although the likeness was

a strong one, there was enough difference in the appearance of Youngs

and the photograph to make a jury hesitate. I put Youngs in the same

position in which he was taken in the picture, the genuineness of which

was admitted, and made a photograph of the same size. Then the likeness

became more apparent, and exact measurements showed the two faces to

measure the same in all respects. For instance, the distance between

the mouth and the eye, which is seldom the same in two persons, was

exactly equal. Then one picture was made transparent and superimposed

over the other, and the two faces matched perfectly. The jury decided

that the claimant was not an impostor.

"In the case of Hall, the head clerk of the Newark Treasurer's office,

everything depended upon showing that he changed a figure 5 into a

figure 3. He ran away to Canada, and was brought back upon a charge

of forgery. His counsel claimed that the figure had not been changed,

and that if the mark of an eraser was found, and that the figure 5 had

been changed, it was caused by the accidental slip of an ink eraser

used in the margin. I made photographs of the page, and by means of a

stereopticon threw a picture of that particular figure upon a screen 10

feet high. Upon that scale several interesting things came out. It was

seen very plainly that the figure had been altered from a 5 to a 3, but

the erasure had been made with a different material from the erasure in

the margin. We tried a rubber ink eraser, and the result was the same

as seen in the margin. Then we tried a steel penknife, and the result

enlarged a thousand times was the same as seen over the figure 3. This

disposed of the 'accident' theory, and Hall was convicted.

"I was employed in the Cadet Whittaker case, and worked for weeks at

the famous letter of warning--a few words scribbled on a piece of

paper, which Whittaker was suspected of writing. All the cadets were

called upon to give specimens of their handwriting, and the writing of

No. 27 was declared by the experts to be that of the note of warning. I

believed that it was not, and, taking the specimen of No. 27's writing

upon which he was suspected, I duplicated the note of warning, cutting

the same letters out of 27's specimen, and placing them together as

nearly as possible in the order of the famous note. It was a work of

tremendous labor, but when done it showed the innocence of No. 27. It

was suspected that the scrap of paper upon which the note of warning

was written was torn from a letter sheet which Whittaker sent to his

mother, but that theory was disposed of upon enlarging the two edges to

the size at which a fine cambric needle looks like a crowbar. Then it

was seen that the two edges had never been together. The verdict in the

Whittaker case was finally reversed upon the ground that the court had

come to a decision from the examination of lithographs of the note of

warning, which I proved by comparison with a photograph were incorrect.

Whittaker, by the way, is teaching school now in the northern part of

this State. He made speeches for Cleveland in his neighborhood during

the election campaign last autumn."

* * * * *

[Continued from Supplement No. 384, page 6127.]

Scientific American, September 29, 1883 Supplement. No. 404 · 第 22 / 75 题