Thomas Henderson eBooks
eBooks di Thomas Henderson di Formato Pdf
Astronomical Observations Made at the Royal Observatory, Edinburgh: From October 1834 to December 1835. E-book. Formato PDF
Thomas Henderson
edizioni Forgotten Books collana , 2017
The process of reversing the instrument is conveniently and safely per formed by means of an apparatus, which allows the counterpoises to act before the pivots touch the Y's, so that no additional pressure is exerted upon them, and the instrument is replaced without the least collision. Five vertical Wires and one...