136 THE A B C OF PHOTO - MICROGRAPHY 



ered into the grooves will speedily cut 

 through the enamel or varnish, exposing the 

 paper fabric to action of the hypo, and then 

 very soon its life will be ended. 



Washing Box. A tray will answer for final 

 washing of the plates, but is not recom- 

 mended, especially if a number are to be 

 done at one time. There is great danger of 

 scratching the soft, wet films; and if the 

 water contains any dirt in suspension, it is 

 sure to settle upon their surfaces. Washing 

 boxes, as now made, will carry any size of 

 plates up to their full capacity. These stand 

 on their edges, and the water being admitted 

 at the bottom, flows upward until the box 

 is filled and the overflow runs off at top. 

 This not only washes the plates better than 

 it can be done in a flat tray, but in less time 

 and with greater safety from damage. If 

 there be no supply of running water at hand, 

 a cork may be inserted in the intake at bot- 

 tom and the box filled from a pail, changing 

 the water several times by removing the cork, 

 emptying and refilling box, until the washing 

 is completed. 



Measuring and Recording Amplifications. I 

 would earnestly urge upon every photo-mi- 

 crographer the importance of measuring the 



