104 PICTURING MIRACLES 



crete piers imbedded in the cement floor, should 

 give steady pictures. 



The microscope should be of the best standard 

 make. It should have mechanical stage, horizontal, 

 and vertical movements and also revolving and cen- 

 tering devices. I have two. One cost $375, without 

 lenses or eye pieces, the other $ 1 50, and the latter is 

 in its case most of the time as it lacks so many adjust- 

 ments. For special comparative work I often use a 

 tandem microscope. This, without lens, cost only 

 $ i o, second hand. As to lenses and eye pieces, the best 

 are necessary. I have achromatic sets from 3 mm. 

 to 16 mm. and lower power ones up to 48 mm. If I 

 want the greatest depth of focus I use an 814" 5x7 

 camera lens, and magnify the image with the tan- 

 dem microscope to whatever size I wish. The eye 

 pieces should be in steps from o to 24 times. An out- 

 fit with all the needful attachments will cost from 

 $3,000 to $5,000, including camera. It is advisable to 

 get or make the special equipment as needed. I have 

 seen all sorts of setups, homemade and otherwise, 

 some of them getting good results, but the things 

 that will enable you to do the same things over and 

 over quickly and accurately, in handling the micro- 

 scope and camera, are the things that count. The 

 careful mounting of microscopes and camera is 

 most essential. What the cost of an outfit will be is 



