HOW DOES THE EYE RESEMBLE THE CAMERA? 149 



STORY TEST 



ALBERT TELLS ABOUT His PINHOLE CAMERA 

 Read carefully and critically. List all the errors and suggest corrections. 



This box I hold before you is a " pinhole " camera. I made a 

 large hole in the front end of the box. Then I made a small hole 

 in a piece of tinfoil with a needle and fastened this so-called pin- 

 hole over the hole in front of my box. I fastened a film in the back 

 end of the box in a dark room, put the cover on, held my hand over 

 the pinhole, and came out into the light. I placed the camera six 

 feet from a bouquet of flowers which were in the sunlight. All 

 of the rays of light given off by the flowers went through that tiny 

 pinhole. They were bent as they went through and then made 

 an image on the film. After covering the hole and returning to 

 the dark room, I found the film had a picture of the flowers on it. 

 To make this remain on the film, I developed the film in a solution 

 called the developer. I washed the film and dried it in a lighted 

 room because light cannot hurt it after development. After the 

 film was dry, no picture was visible on it, but by printing on sensi- 

 tive paper I could make a beautiful picture of the flowers. I 

 haven't done this yet, but I know just how to do it. Place the 

 paper on the film, coated sides together. Hold film towards the 

 light. Then put paper into a hypo solution to fix it and to make 

 the print permanent. Wash and dry. 



PROBLEM IV. HOW DOES THE EYE RESEMBLE 

 THE CAMERA? 



We all know that the camera in its simplest form is a 

 black, light-tight box containing a lens at one end and a 

 place for a sensitive film at the other. Light is allowed 

 to pass through the lens and is brought to a focus on the 

 film. Here the picture is recorded on the film, which may 

 be taken to a dark room and developed and made per- 

 manent. The human eye is like a camera in many ways, 

 but it is much more delicate and complex. If we were 

 to take a section through the human eye at right angles 

 to the front of the face, we would see its likeness to the 

 camera. Near the front of the eye is a transparent lens 

 which throws a picture on a surface called the retina, at 



