Popular Science Monthly 



255 



yellow on another. This enables one to 

 tone to different and appropriate colors 

 those patches of the picture corresponding 

 with different colors in the chart. It is 

 then only necessar>- to combine the blue 

 and yellow pictures face to face, to obtain 

 the required color photographs. Should 

 transparencies be made, to correspond with 

 the separated blue and yellow colored 

 portions of the chart photographed and 

 then overlapped, it will be possible to 

 obtain not only patches of white, where no 

 color appears in either positive, but what 

 will pass for a very good substitute for 

 black where the very strong yellow of one 

 plate overlaps the blue of the other. 



The panchromatic negative plate can be 

 used for making a blue print on glass by 

 exposing with a fixed-out plate, sensitized 

 with blue-print sensitizer solution. The 

 yeliow picture positive can be obtained by 

 means of the lantern slide negative used 

 with a collodio-chloride printing-out paper. 

 The fixing should be done with ammonia to 

 give a yellowish red positive. This positive 

 should then be attached face to face to the 

 glass blue-print and then a tvN^o-color photo- 

 graphic effect will be obtained. 



You Can't Find Your Brushes or Your 

 Razor in Your Bag ? Then Try This 



AX automobile accessory 

 L which is intended to do 

 away with certain trou- 

 bles of the tourist, 

 such as the mis- 

 placing of 

 brushes, combs 

 and other toilet 

 articles, has been 

 incorporated i n 

 the product of a 

 Philadelphia ma- 

 ker of bags and suit- 

 cases. As shown in 

 the accompanying illus- 

 tration, it consists of a 

 strap slipped through 

 the slots in a band sewed 

 to a leather flap which fits into the cover of 

 the suitcase and is held in place by means of 

 snap buttons. Each toilet article is 

 slipped into one of the strap loops. Then 

 the strap is pulled tight to hold it in 

 place. The loops are adjustable for larger 

 articles by removing the strap from one 

 slot and inserting it in the next. When 

 filled, the flap is folded over into the 

 cover and held in position by snap buttons. 



The cork bricks are laid in Portland cement 

 over a sub-base of crushed stone or ashes 



Comfortable Cork Brick Flooring 

 for Cattle 



THE search for a warm, non-absorbent 

 flooring suited to the needs of horses, 

 cows, hogs and sheep has led to the adop- 

 tion of cork brick. The brick consists of 

 finely granulated cork and refined asphalt, 

 heated and thoroughly mixed, and then 

 molded under pressure into bricks nine by 

 four by two inches. The flooring is laid in 

 cement mortar over a 

 sub-base of concrete 

 and crushed stones or 

 ashes. 



Asa flooring for 

 stables, cork brick has 

 been found to be dur- 

 able in service, warm, 

 easy under foot, and 

 entirely sanitary. It 

 is also practically 

 noiseless, never 

 5lipper>', readily 

 installed, and 

 moderate in cost. 

 Breeders of prize 

 stock cattle have been 

 on the alert for several 

 years for an impro\ed type of flooring to 

 protect their stock against changing 

 weather. Cork brick flooring is said to 

 give a maximum of comfort. One chief 

 advantage of it is that it allows of frequent 

 washing because it dries so quickly and be- 

 cause it does not become slippery and 

 dangerous under foot. Several large dair>' 

 farms in the middle west are said to have 

 installed the new brick in their barns. 



Each article fits in the loop of a strap 

 which is adjustable to different sizes 



