195 



Angle Mirror or Optical Square, 



$6.OO 



See Preface. 



Sextant.* 



Sextant. Radius, 7 inches, 145 ; four sun-glasses between tna large and the 

 small reflecting mirror, and three sun-glasses behind the small reflecting mirror, ail 

 of which can be turned on their axis 180; graduation on solid silver, reading to 10". 

 telescope f inch aperture ; two astronomical eye-pieces with powers of 6 and 10 dia. 

 One Galilean telescope with extra large objective, power 3 dia. ; one fixed reading 

 glass ; two sights for examination and correction of the large reflecting mirror. All 

 complete in box. Best quality, imported. . . Price, as above, $13O. GO 

 Sextant, as above. Radius 10 inches, ail complete in box. . Price, 15O.OO 

 Pocket Sextant, best quality 43.00 



* See Preface 



