155 



The Berger Solar Attachment and Top Telescope Combined. 



A. Instrument with Solar Attachment ready for an observation. 



B. Eye end view of Solar Attachment showing patent lateral adjustment to enable us to place the 



Solar Telescope exactly in same vertical plane with the main one, to serve as Top Telescope 

 in mine work. 



C. Shows Solar Telescope used as Top Telescope in mine work. 



D. Latitude Level, if ordered, for use with Solar Attachment, 

 b, b. Wire Diaphragm in Solar Telescope, see page 168. 



