l62 



RECREATION. 



dust that is almost sure to be present in 

 the folds of the bellows. Or the wind it- 

 self might be charged with dust, which 

 would settle on the film when the shutter 

 is drawn. Again, by opening the camera 

 back the full glare of light will enter, and 

 the bellows will often retain enough to 

 fog a rapid plate. Slip your dark slide in 

 as quickly as possible after opening the 

 back of the camera. 



To unmount prints put them face down 

 on a clean board or on glass. Wring out 

 a cloth that has been soaked in water, 

 preferably warm, so it will not drip, and 

 place it, 3 or 4 folds thick, on the prints. 

 It should be so folded that its size is just 

 sufficient to cover them. Put another 

 piece of glass on the top, and then a 

 weight. Leave the whole arrangement 

 several hours, until the mount is thor- 

 oughly damp, when the print will come 

 off, without being damaged. 



A simple print washer can be made with 

 a square biscuit tin by boring some small 

 holes in one side about 2 inches from the 

 top ; and then putting it under a tap to 

 which a piece of india rubber piping has 

 been fixed. Enough piping is wanted to 

 touch the bottom of tin. This will keep 

 the water in motion. The tap should be 

 turned on full enough to keep the water 

 above the waste holes, but below the top 

 of the box. 



To make the dark room lamp safer 

 stand it near the wall. Take a sheet of 

 cardboard, and-tack one side to the wall, 

 driving in 2 tacks on the other side of the 

 lamp with their heads left out, so as to 

 catch the cardboard when bent around 

 the lamp. Cut out a hole in the cardboard 

 in front of the glass, and black all the in- 

 side. Lampblack and paste make a good 

 dead black. A leaky lamp may be made 

 quite safe in this way. 



An efficient background can be made 

 Math a few sheets of brown carpet paper. 

 Fasten them together to make the re- 

 quired size and brush them over with a 

 strong paste. Put some soot or cheap 

 lampblack in a pepper pot and carefully 

 shake out on to the wet brown paper any 

 design that is wanted; afterward go over 

 with a stiff brush, shading off as required, 

 and dry thoroughly. 



A good thing at a small cost may be 

 made by stuffing part of a sponge in a 

 large bottle, half the sponge sticking out. 

 Any chemicals accidentally spilt can be 

 mopped up easily with it. It is also ex- 

 cellent for spreading mountant, as there 

 are no bristles to lose, and when full of 

 naste it can be stood up on its handle. 

 It is easily cleaned by pulling sponge and 

 bottle apart. 



To make a plate duster take 2 pieces of 

 wood each about 4 inches long and J /> 

 inch square, and glue them together in 

 the form of a T. Over the top of this 

 fasten a piece of plush by gluing along 

 each side, taking care to leave it loose 

 enough to insert a piece of cotton wool. 

 This forms a reliable plate duster, which 

 can be thrown away when dirty. 



An important thing to remember when 

 toning gelatino-chloride prints, in order 

 that they may tone easily, is to see that 

 they are thoroughy cleansed in the pre- 

 liminary washing. By so doing time and 

 gold will be saved. 



In the carbon process warmth and damp 

 both cause the sensitized tissue to become 

 unworkable. In a climate where there are 

 rapid changes the tissue should be printed 

 as soon as possible after sensitizing. 



Always use a backed plate for an en- 

 larged negative, especially if there are 

 strong high lights. — Photography. 



USE OF COMBINED LENSES. 



Seattle, Wash. 

 Editor Recreation: 



Mrs. Porter, in her article in January 

 Recreation, says to L. H, R. Gass she 

 can not see how using the lenses double 

 or single makes any difference in the 

 length of the exposure. Is not Mrs. P. mis- 

 taken about that? I use a telephoto lens, 

 and in using the single lens alone I always 

 give 4 times the exposure of the double, 

 as that is what I have always understood is 

 necessary. It is said the speed of a lens 

 depends on the size of the picture. If that 

 is so, which is the faster, a double lens 

 working with stop F 16 or a single lens 

 working with the same stop? 



As Mrs. Porter ^as been several years 

 taking photos of birds and birds' nests, 

 why did she not enter some of her pic- 

 tures in Recreation's contest? 



I wish Mrs. Porter would inform me 

 through Recreation whether the portrait 

 lens and the wide angle lens of the am-. 

 pliscopes work satisfactorily. If I want to 

 use the portrait lens and the correct expo- 

 sure is 1-5 of a second with my doublet, 

 what exposure shall I give? What ex- 

 posure with the wide angle? 



Henry P., Seattle, Wash. 



ANSWER. 



The mistake to which you refer was ex- 

 plained in May Recreation. 



Authors vary as to lengthening the nor- 

 mal exposure, in using the back combina- 

 tion of a doublet, 2 to 5 times. Four times 

 being between the extremes, would be 

 about right. A doublet and a single lens 

 at the same aperture require 2 to 5 times 

 the length of exposure for the single lens. 



