It is interesting to know that the United States is furnishing three times as much radium annually as all the rest of the world together.

It is also interesting to know that the sensitive photographic dry plate plays the most important part in the tests used to detect the presence of radium in ore.

The Bureau of Mines has published a rather complicated process, but a practical miner offers a more simple method which produces the same results: Place a plate in an ordinary plate holder, lay a key on top and cover with a couple of handsful of ore to be tested. Let stand for seven or eight hours and develop the plate. If there is radium present in reasonable quantity an image of the key will be seen on the plate.

When one considers that it often requires as much as fifty or one hundred tons of radium bearing ore to produce one milligram (.015 of a grain) of the metal, it will be seen how difficult it would be to detect so infinitesimal an amount of radium in so small a sample of ore were it not for its light action on the sensitive plate.

The present price of radium is $120 a milligram ($54,000,000 a pound).


We make but one condition in our offer of cuts for the use of photographers.

It is obvious that two photographers in the same town would not care to use the same cut, and we are therefore obliged to limit this offer to one photographer in a town. It will be a case of first come first served. The first order from a city will be promptly filled. Succeeding orders (if any) will necessarily be turned down and the remittance, of course, will be returned. It is also obvious that we cannot, on account of the cost of the drawings, furnish any large variety of cuts at the nominal prices quoted, and therefore can offer no substitute cut. The thing to do is to get your order in first, as it would not be fair to give the man who happens to get in his order early one month, a permanent advantage; we shall book no orders in advance. They must always specify the number of cut wanted. These cuts consist of the illustrations only, thus making it possible for the printer to change the wording or the amount of space to be occupied by the wording if so desired.

E.. K. Co.

The Radium Test StudioLightMagazine1914 41

Perhaps this quaint picture may recall some pleasant occasion - a dance or party, and the becoming costume you wore.

Any event worth remembering suggests a picture. And our modern lenses enable us to catch the spirit and action of a dainty pose almost instantly.

Make the appointment to-day.


No. 199. Price, 80 cents.

The Radium Test StudioLightMagazine1914 42


Eastman Professional School Negative

The Radium Test StudioLightMagazine1914 43

BULLETIN: THE EASTMAN SCHOOL OF Professional Photography for 1914

Boston, Mass...................February 10, 11, 12

Montreal, Que...................February 17, 18, 19

Toronto, Ont...................February 24, 25, 26

Buffalo, N. Y...................March 3, 4, 5

Cleveland, Ohio...................March 10, 11, 12

Grand Rapids, Mich...................March 17, 18, 19

Indianapolis, Ind...................March 24, 25, 26

Chicago, Ill...................March 31, April 1, 2


Our business was established on a quality basis.

It has grown because we act on the belief that we can maintain our position in the trade just so long as we make better goods than our competitors - and no longer.

Our customers receive the benefit of the most advanced photographic thought of Europe and America. Our American and foreign factories are in constant touch with each other. Each has the benefit of the work and the discoveries of the other. The very breadth of our business enables us to give to each department absolutely the best that the world affords in technical skill and in producing facilities. The man with a new photographic idea turns to Rochester for a market just as he turns to Washington for his letters patent.

Our theory is that we can best serve ourselves by supplying our customers the best goods. Our acts have made this Theory a Policy, for we have not merely the desire to make the best goods but the means of converting that desire into a Reality.

In our thirty years in the photographic business there have been several revolutionary changes. Doubtless there will be many more. Whatever they may be our Policy shall be to furnish (without following every mere will-o'-the wisp) the very best of those goods which painstaking testing shall prove to be of benefit to our customers in the Simplification of Photographic Processes and the Advancement of the Art.

E. K. Co.

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Eastman Professional School Demonstration

The Radium Test StudioLightMagazine1914 45



Vol.5 JANUARY 1914 No. 12

Our Illustrations

Twelve pictures, from twelve successive exposures on the same subject, but all differing in pose and lighting - such is the remarkable character of the illustrations in this issue of Studio Light.