558 



SCIENTIFIC RECREATIONS. 



tripod stand. The upper portion will be found movable by loosening the 

 screw, V. By another simple arrangement the table can be slanted, and 

 by turning a screw we can entirely slope the side of the chart where 

 midnight (ininuit) is written. Being placed opposite the polar star we take 

 the upper part of the chart by the button, G, and bring it before us by a 

 hori-zontal rotative movement. 



Fig. 6^2. Celestial Indicator. 



We now place the sliding indicator upon midday (midi), and keep it 

 in that position while working the apparatus that is, until we have caught 

 sight of the polar star in the centie of the crescent, c, by means of the 

 eye aperture, o. We have now obtained the meridian, and care should be 

 taken to tighten the screw, V. Then the table is raised to its fixed place 



