1 64 



RECREATION. 



Sodium Phosphate HNa2P04 



Phosphoric Acid H3PO4 



Silver Chloride AgCl 



The compounds for which Mr. Knowles 

 gives the symbols do not exist. 



As additions to the list of symbols for 

 use as labels I suggest: 



KBr Potassium Bromide 



H2SO4 Sulphuric Acid 



Na2S03 Sodium Sulphite 



HC1 Hydrochloric Acid (Muriatic) 



(NH4)Br Ammonium Bromide 



AuCl3 Gold Chloride 



NaCl ....Sodium Chloride (common salt) 



Additional abbreviations: Sol. for solu- 

 tion; Sat. Sol. for saturated solution. 



Labels written with red ink are more 

 easily visible in a dim light than with 

 black ink. If varnished after fixing to bot- 

 tles they will keep clean and neat for years. 



Users of Vinco paper who like to have 

 their developer work slower can by adding 

 granulated sugar to the mixed developer 

 slow its action to any degree. I use 15 

 grains of sugar to each ounce of mixed 

 developer. The sugar acts only mechanic- 

 ally and does not affect the blacks or 

 whites of the print. Use usual amount of 

 KBr. 



Isador S. Trostler, Omaha, Neb. 



SNAP SHOTS. 



Is there a book giving instruction in 

 making transparencies? Please tell me a 

 good varnish for, plates and how to use it. 

 L. F. Logan, East Providence, R. I. 



ANSWER 



I know of no book wholly devoted to 

 transparencies. "Lantern Slides and Slide 

 Making," published at 50 cents by the 

 Photo-American Co., Bible House, New 

 York, will come near being what you 

 want, since a lantern slide is but a small 

 transparency. 



The best negative varnish I know of is 

 made by the American Aristo Co. You 

 can get it in any Boston stock house, 

 Lloyd's for instance. 



To varnish a negative warm it slightly 

 and pour about 2 drams on the center, 

 holding the negative level Incline it 

 a little so the varnish will flow to the 

 right hand upper corner, then flow it back 

 to the upper left hand, then down to lower 

 left and finally to the lower right hand 

 corner, allowing all surplus to then drain 

 back into the bottle. It is quite a knack, 

 but you will get it after seeing it done 

 and trying a few times. — Editor. 



Please give a formula for a home made 

 mounting paste. 



Are Solio prints acceptable in your 

 photo contest? 



W. H. Ireland, Earlville, N. Y. 



Try less exposure and a little bromide 

 of potash as per Velox directions. 



In an ounce of tepid water stir enough 

 corn starch to make a thick cream. Put 

 this in a warm cup. Pour in enough boil- 

 ing water containing 20 drops formalin 

 to fill cup, and stir vigorously till the mass 

 is opalescent. Let it become cold and 

 strain through cheesecloth. Never use it 

 hot. 



Prints made on any paper may be en- 

 tered in Recreation's photo contest. Any 

 number of subjects may be entered and the 

 prints may be of any size. 



Is there a photgraphic positive paper 

 manufactured? I want a paper on which 

 I can make pictures and develop and finish 

 at once, without making a negative and 

 printing I read the amateur photo de- 

 partment in Recreation every month. I 

 own a 4 x 5 folding camera. Can you tell 

 how to make an outfit to photograph elec- 

 tric sparks. A. H. C, San Marcos, Tex. 



ANSWER. 



There is no such paper as you wish, nor 

 is it likely there ever will be. You can 

 get coated ferrotypes, dry and ready for 

 exposure, from American Dry Plate Co., 

 Worcester, Mass, or their agents. These 

 plates, of course, can not be printed from. 

 You would simply get a tintype at each 

 exposure. 



A description of an outfit for photo- 

 graphing electric sparks would require 

 more space than I can give. — Editor. 



' Have you the best possible outfit ready 

 for your summer photographic work? 

 Such an outfit is expensive. Why not get a 

 high grade camera for nothing except a few 

 hours' work? By sending me only 5 yearly 

 subscriptions at $1 each, you can earn for 

 yourself a Wizard camera listing at $10. 

 It is the equal of any camera made at the 

 price, and by getting one in this way you 

 will have $10 ahead for buying other sup- 

 plies. 



I can get good prints on Solio, but with 

 the same negative Velox prints appear 

 blurred and have gray high lights. What 

 is wrong? 



Are you saving your photo prints r If 

 not, begin at once. Send me 2 yearly sub- 

 scriptions to Recreation, at $1 each, and I 

 will send you a Buechner album that will 

 hold 100 4x5 prints. It will be of great 

 value to you in showing the progress you 

 make in your photography, from the first 

 page to the last, and your prints will al- 

 ways recall interesting memories. 



