THE

Australian Photographic Journal

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Vol. V. SYDNEY, JULY 20, 1896. No. 7.

EDITORIAL DEPARTMENT.

All Literary Contributions, Queries and Answers, Photographs for Competition or Criticism, Books or Apparatus for Notice or Review are to be addressed to the Editor, Australian Photographic Journal, 66 King Street,. Sydney.

PUBLISHING DEPARTMENT.

All letters containing Subscriptions, Orders, Remittances, Sale and Exchange Advertisements, or other business matters to be addressed to the Manager, Australian Photographic Journal, 66 King Street, Sydney.

IV. he will require an entry for each set of 3 pictures competing, which will, of course, entitle the competitor to any of the six prizes in this class. The same applies to Classes III. and V.

It is not necessary to send nom de plume with Entry Form; it can come with Exhibits on envelope in which name is enclosed.

THE

Bustralian |p»botograpbtc Journal,

EXCHANGE AND MART.

UNIVERSAL TRANSPARENCY.

Sydney, July 20, 1896.

WJIj PIJIZE COMPETITION.

As a result of many communications r e-ceived, we have decided to extend the date for receiving Entries and Exhibits for the Fifty Pounds Prize Competition, particulars of which we gave in our last issue. Entries will now be received up to the 15th August, and Exhibits are to be sent in before the 30th of the same month. Entry Forms for this Competition appeared in our June issue, and those who may wish to make further entries in the various classes should send for copies at once to the Office of the Journal, when they will be immediately forwarded.

For general information, we would state that it will be necessary to make an entry for each set competing ; thus, a competitor entering in Class I., and sending 12 pictures, will require one entry for this class. If he wishes the same pictures to compete in Class II. he will require an entry for each 6 pictures competing, and if he wishes the same pictures to compete in Class

OPACITY OVERCOME.

PROFESSOR DAVIS, of Parkersburg, it is said, has informed the American Chemical Society that he has found that by a combination of four chemicals any opaque object can be rendered transparent. He also claims to have made a second and later discovery : that the powers of the chemicals can be transmitted by means of small wires to a metal plate which, if enclosed in a dark box, makes a fluorescent screen, and by. looking through it all opaque objects become transparent. This discovery, if it should be confirmed, we are further told, will rival in importance that of Professor Rontgen, and we quite agree.

Like many of these revelations of Nature’s secrets, Professor Davis’s discovery was the result of an accident. He was engaged in soldering, seated at his table with three bottles of chemicals before him. In one hand he held a fourth bottle, and in the other a file. By accident he held the file between the bottle in his hand and the three bottles on the table, and to his astonishment only the ends of the file extending beyond the bottles were visible. Struck with this remarkable phenomenon, he made tests with numerous other objects, including the hand, and all appeared transparent. He has constructed an apparatus which admits of his discovery being practically availed of,— Photographic Xeivs,

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Le texte affiché peut comporter un certain nombre d'erreurs. En effet, le mode texte de ce document a été généré de façon automatique par un programme de reconnaissance optique de caractères (OCR). Le taux de reconnaissance estimé pour cette page est de 98,27 %.

La langue de reconnaissance de l'OCR est l'Anglais.

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