5i8 



RECREA TION. 



and violets less opportunity of becoming 

 •overdone in a normal exposure. 



The apparatus made by Bausch & Lomb, 

 of Rochester, and known as the R.ay filter, 

 is a cell fitted with a collar which fits over 

 the lens. It is filled with a solution of bi- 

 chromate of potash, which is orange in 

 color. Its mission is to control the blue 

 and violet rays which have an exalted ac- 

 tinic action, and it does this by coloring 

 the picture, that you see on the ground 

 glass, uniformly yellow. Then expose on 

 iso-chromatic plate (that is particularly 

 sensitive to yellow) and you have a picture 

 that is in harmony. 



PHOTOGRAPHING HORSES IN MOTION. 



Editor Recreation: If you will allow 

 ■me to add a few words to your reply to F. 

 D. Fowler, Denver, Colo., on p. 336 of 

 October Recreation, I would advise him 

 to use as large a portrait lens as he can get, 

 to photograph horses in motion. The por- 

 trait type of lens has a shorter focus than 

 the rapid rectilinear, and is therefore a 

 ■quicker type, other things being equal. I 

 would prefer a Voigtlsender Euryscope 

 (portrait) to the Dallmeyer, for out door 

 work. Both are excellent, but the Voigt- 

 la^nder gives a finer atmospheric render- 

 ing. The use of a large lens, one of large 

 diameter, gives great gathering power as 

 regards light-rays. A medium stop will 

 give sufficient sharpness, on a small plate. 



I fear the shutters you recommend are 

 hardly fast enough to get pictures without 

 olur. A running horse will move his feet 

 about 100 feet a second, at parts of the 

 movement. A shutter must work at roo of 

 a second to get even approximate sharp- 

 ness, which can be so modified, by retouch- 

 ing, as to be satisfactory. However, *i« of 

 a second is much more desirable, and in 

 good light, with a large lens and a well 

 contrasted background, this will be time 

 enough. I know of but one shutter that 

 will do this, and that is the Focal Plane 

 shutter, an English contrivance. Prosch's 

 Athlete shutter is next, with a speed of 4 oo 

 of a second. 



I offer these suggestions as the results of 

 some practical experience in this line. 

 With every possible precaution even an ex- 

 pert misses manv pictures of this sort. 



R. Ferris, Shokan, N. Y. 



FOCUSING. 



The idea of many photographers, some 

 professionals as well as amateurs, is that 

 the proper thing to do, always, is to get the 

 image or view sharp. But to the scientific 

 worker, and to one who knows something 

 •of art as well as of photography, this is by 

 no means an invariable rule. The Photo- 

 graphisches Notis-buch gives a method 

 adopted by one of its readers. In order to 



make the best of the depth of focus in the 

 lens, the most distant object that is de- 

 sired to be sharp must be got into focus be- 

 fore all else, without using a diaphragm. 

 After this has been secured put in the stop 

 selected as being the proper one to use on 

 the occasion; then observe, the point 

 (nearer than the one taken at first) where 

 the sharpness ceases. Then remove the 

 stop and focus this point; again replace the 

 stop and focus this last point; place the 

 stop again in the slot, and the result will be 

 satisfactory. But in photographing por- 

 traits the reverse method should be 

 adopted; the nearest object must be first 

 focused, afterward dealing with those 

 points the most distant. — Photography. 



WARM-TONE GOLD INTENSIFICATION FOR 

 PLATINOTYPES. 



When a platinotype is weak, and a rather 

 warmer tone than that of the normal plati- 

 notype print is desired, Mr. Dollond's 

 method may be adopted. The wet print is 

 laid face upward, on a glass plate, and after 

 the excess of moisture has been blotted off, 

 glycerine is spread over the surface, with 

 the finger or with a Blanchard brush. By 

 mixing a few drops of weak chloride of 

 gold solution, say 1 grain to a drachm, with 

 2 or 3 parts of glycerine, and spreading this 

 over the surface of the print, the image 

 gradually becomes intensified and toned. 

 When a stronger action is desired, here and 

 there, a few drops of the chloride of gold 

 solution may be poured on the print and 

 incorporated with the glycerine already on 

 the paper. As soon as sufficiently toned 

 and intensified, both front and back should 

 be freely sponged with water, after which 

 the print should be washed by several soak- 

 ings. Subsequent treatment with a reduc- 

 ing agent has been recommended, but may 

 be dispensed with. — The Amateur Photogra- 

 pher (British). 



Ruskin says, " Art is that in which the 

 hand, the head and the heart go together." 

 Those people who use only their heads and 

 their hands had better keey out of photog- 

 raphy. 



I note you offer a 4 x 5 Cyclone camera 

 for 5 subscriptions. You need not be afraid 

 to recommend it. They are giving the best 

 of satisfaction here. 



L. G. Torrey, Leslie, Mich. 



I will esteem it a personal favor if you 

 will send me the names and addresses of 

 all the sportsmen you know, who are not 

 yet readers of Recreation. 



In making up your list of Christmas 

 presents put down a yearly subscription to 

 Recreation, for each of your best friends. 



