POSTSCRIPT. 



The following notice was received too late for inser- 

 tion in its proper place in Chapter IV., Section I. 



HAVERFORD OBSERVATORY. 



This observatory is situated about nine miles west 

 of Philadelphia. The building is of stone, and consists 

 of a central part about 20 feet square, and of about the 

 same height, with two wings, each 15 feet square, and is 

 surmounted by a revolving dome 19 feet in diameter. 

 The instruments are an equatorial telescope ; a meridian 

 transit circle ; a prime vertical transit ; a sidereal clock ; 

 and Bond's magnetic register. The equatorial, by Henry 

 Fitz, has an aperture of 8| inches, and a focal length of 

 11 feet. It is mounted in the Fraunhofer style, on a 

 marble pedestal 8 feet high, which is supported by a 

 stone pier 6 feet in diameter, passing through the floors 

 of the building, and resting upon solid masonry 8 or 10 

 feet below the surface of the ground. This telescope 

 has an excellent spider-line, and also an annular mi- 

 crometer, with five eye-pieces, magnifying from 60 to 

 500 times. It is provided with a clock-movement. 



