Declinograph

Declinograph (also declinometer ) is a device designed in 1878 by the Berlin precision mechanic Rudolf Fuess for the graphical recording of declination differences in astronomy .

The declinograph has two steel tips:

• one is connected to the moving thread of the impersonal micrometer , which is used to adjust the declination,
• the other with the fixed parts of the eyepiece piece .

A strip of paper is pressed against these tips at the moment of adjustment; the distance between the two marks made by the peaks, which can be measured later, gives the declination difference.