k£CREATlUN. 



solution and keep in motion. When reduc- 

 tion has gone far enough, remove the nega- 

 tive and wash it thoroughly. I find a much 

 easier way of using this method is to make 

 as needed a solution of ferricyanide of po- 

 tassium, using about half a dram, bulk 

 measure, of the crystals to 8 ounces of wa- 

 ter. If the negative is to dry soak it in the 

 hypo fixing bath half an honr before put- 

 ting it into the ferricyanide solution. If it 

 has been just developed and fixed place 

 it in the ferricyanide solution directly 

 from the hypo bath. The film will carry 

 enough hypo to enable the ferricyan- 

 ide to accomplish reduction. Rock the 

 tray constantly, stopping frequently to ex- 

 amine the plate, and take it out of the bath 

 when the reduction is sufficient. Then 

 wash the negative about one hour. 



To reduce with ammonium* persulphate, 

 place the well soaked and thoroughly 

 washed negative in a solution made by dis- 

 solving one dram, bulk measure, of the per- 

 sulphate in 4 ounces of water. This solu- 

 tion does not keep well, so it must be 

 freshly made each time. Keep the tray in 

 motion, and when reduction has taken place 

 transfer the negative to a solution of 2 

 drams of sodium sulphite and 4 ounces of 

 water, which in a few minutes will stop 

 the action of the persulphate. Follow this 

 by a thorough washing. 

 R. L. Wadhams, M. D., Wilkes-Barre, Pa. 



HOW TO PRINT ON CROCKERY, ETC. 

 The easiest and cheapest method is to 

 print direct from the negative. Only film 

 negatives can be used for part of this work. 

 To print proceed as follows : Beat up suf- 

 ficient quantity of the white of eggs to 

 cover the portion of the surface desired 

 to print on, and then mix the following so- 

 lutions : 



No. 1. 



Water 4 ounces 



Red prussiate of potash 6 drachms 



No. 2. 



Water 5 ounces 



Citrate of iron and ammonia. . 7 l / 2 drachms 



Spread the white of egg evenly over the 

 surface, and, when it has dried thoroughly, 

 sensitize with solution made of equal parts 

 of No. 1 and No. 2. When this is dry the 

 porcelain is ready to be printed on. Place 

 the film over the sensitized surface by using 

 wax at each corner to keep it in position. 

 It may then be printed in strong sunlight. 

 There will be no need to remove the film 

 to see how dark the image is growing, be- 

 cause with the above formula it will not 

 print beyond a certain depth. Print for 

 about half an hour. Then wash the porce- 

 lain for about 15 minutes in clear water. 



Better results may be obtained by using 



gelatine instead of the white of eggs. For- 

 mulas 1 and 2 will give a bluish picture, 

 but if desired the following sensitizer may 

 be substituted : 



Water . 1 ounce 



Silver nitrate 50 grains 



Print deep and tone in a gold bath. Im- 

 ages obtained from using the first formula 

 will remain permanent. In printing on 

 clock dials, etc., more care will have to be 

 exercised. Do not use either egg or gela- 

 tine. Better use a piece of transparent film, 

 the exact size of the negative to be printed 

 from. This may be obtained by soaking a 

 worthless glass negative in a solution made 

 as follows : 



A. 



Water 20 drachms 



Red prussiate of potash 1 drachm 



B. 



Water 20 drachms 



Hypo 1 drachm 



As soon as the film is cleared of the im- 

 age, sensitize it with the silver nitrate bath 

 mentioned above, and place it in a rack 

 to dry. By cutting out the shape desired 

 with a sharp knife, the sensitized film may 

 be removed from the glass and transferred 

 to any solid support, and then printed. Of 

 course, when the article to be printed on 

 has a flat surface, glass plate negatives may 

 be used instead of a film. 



In stripping a film from a plate to trans- 

 fer to some other surface, soak the plate in 

 water about an hour. As the film is trans- 

 parent, it will make no difference whether 

 it stretches or not. If, however, it is de- 

 sired to remove the film whole, the plate 

 must be immersed 5 minutes in — 



1. — Ether 50 cubic centimeters 



Alcohol 50 " 



When this coating is dry, place in 

 2. — Sulphuric acid.... 4 cubic centimeters 

 Water 186 " 



As soon as the film begins to loosen, lay a 

 piece of clean white paper over it for a 

 support and carefully separate both from 

 the plate. It can then be transferred to the 

 permanent support. Materials for the first 

 formula can be obtained for a few coppers 

 at any chemist's. — Exchange. 



THE SELECTION OF A CAMERA. 



I note in the April issue of Recreation 

 Mr. Earl Dunn, of Iowa Falls, Iowa, asks 

 readers which 4x5 camera they consider 

 the best for an amateur. 



This is a difficult question to answer in 

 its present form, as the inquirer does not 

 state what scope he desires the camera to 

 cover, whether he expects to use films or 

 plates, or the amount of money he is pre- 

 pared to invest in an instrument. 



Assuming his inquiry to be general, I rec- 



