@Book{Steinheil1868,
author  = "Steinheil, Carl August",
title   = "Das Chronoskop. Instrument zur Bestimmung der Zeit und der Polhöhe ohne Rechnung",
year    = "1868",
address = "München",
series  = "Abhandlungen",
volume  = "Bd. 10, Abth. 2 = [7]",
url     = "https://publikationen.badw.de/de/007408215",
}