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A. G. Mayer — Improved Heliostat. 



Art. XXXIV. — On an Improved Heliostat invented by 

 Alfred M. Mayer ; by Alfred Goldsborough Mayer. 



In 1885 my father, the late Professor A. M. Mayer, invented 

 a heliostat which is superior in many respects to all forms of 

 this instrument at present existing. As far as I am aware, my 

 father never described his invention, and believing that an 



account of its construction may be of service to science, I here- 

 with present a description of the instrument. 



