632 



Popular Science Monthly 



useless unless two cars are placed in the 

 shaft. A two-car system is ideal where 

 the lift is carried to an upper floor with 

 openings on both floors. The upper box 

 has guides of a special design, as shown, 



EXTENSION GUIDES 



to allow the lower 

 cage ropes to pass. 

 The \ winches are 

 set at right angles 

 to permit each lift 

 to be worked inde- 

 pendently. If the 

 upper lift alone is 

 to be used the 

 lower cage may be 

 kept down. The 

 upper winch should 

 be high enough to 

 permit its use when 

 the lower cage is 

 down, as the accompanying drawing shows. 

 Frequently, because of small capacity, 

 difficulty of operation and inaccessibility, 

 it is as easy to carry firewood upstairs in 

 the old-fashioned way. But this lift has a 

 large capacity and its open side not only 

 offers its contents readily, but provides a 

 means of cleaning. While it is often possi- 

 ble to build a lift beneath a stairway, con- 

 venience should not be sacrificed to save a 

 few feet of floor or bookcase space. There 

 should be some way of reaching the pulley- 

 block at the top of the shaft to oil the 

 pulleys. — Edward R. Smith. 



WINCHES AT 

 RIGHT ANGLES 



An extra car for the 

 dumb waiter shaft 



Improving Your Piano by Moistening 

 the Air in the Room 



A RELIABLE piano tuner says that 

 pianos are often injured because 

 they become too dry. Keep a growing 

 plant in the room with the piano and see 

 how much more water it will require than 

 the plants in any other room. A large 

 vase with a wet sponge kept near the piano 

 will supply moisture. — C. A. Wolfe. 



A Simple Camera Attachment for 

 Photographic Enlarging 



ANYONE owning an ordinary folding 

 . pocket camera with adjustable focus 

 can easily make and use this enlarging out- 

 fit. The sketch shows a longitudinal sec- 

 tion and gives an idea of the general 

 arrangement. The box is fitted up with an 

 electric lamp, socket and reflector. The 

 other end has a square hole the size of the 

 opening in the rear of the camera cut into 

 it. Two clamp pieces are cut out and 

 fastened to the box as shown, so that the 

 camera is held firmly to the opening in the 

 front of the box. A slot is recessed over the 

 hole so that a sheet of orange-colored glass 

 will slide in it and cover the square hole. 

 The base-piece is extended several feet 

 beyond the camera and is slotted its entire 

 length. A sliding screen of some light- 

 weight material is made and fastened in the 

 slot in the base with a thumb-screw, as 

 shown. A sheet of fine white tracing paper 

 should be fastened over the inside of the 

 hole in the box so as to diffuse the light 

 from the reflector and prevent unevenness 

 of light distribution. 



Place the film or plate in the opening in 

 the back of the camera and turn on the 

 light. Have the sheet of orange glass in the 

 groove provided for it back of the camera. 

 Darken the room and pin a sheet of 

 bromide or other enlarging paper on the 

 sliding screen with thumbtacks. The 

 orange light coming through the lens will 

 furnish sufficient illumination for this. 

 Now focus the image on the paper by 

 moving the camera bellows in or out and 

 by moving the screen to and from the 



Enlarging pictures with an ordinary camera 

 placed on a box inclosing an electric light 



camera until the correct focus is obtained. 

 Now slide out the orange glass and expose 

 the paper for the required time, after which 

 replace the glass to stop exposure. Develop 

 the paper in a red or orange light only. A 

 sixteen candlepower mazda light will oper- 

 ate the apparatus. — B. Francis Dashiell. 



