130 
P. BIEFELD 
Duration of occultation 
Calculated. 56 23.88 
Measured 55 45.80 
Point of immersion from north point calculated 59°59'57" 
Point of emersion from north point calculated 330 29 52 
Measurements with scale. 1 mm. = 145® 3 
Measurements with comparator. . .’ 1 mm. = 143. 38 
PLATE XVII. 
Fig. 1. Photograph taken at time Ti. 
Fig. 2. Photograph taken at time T 2 . 
Fig. 3. Diagram of two photographs superimposed. 
