This instrument was acquired by the Royal Observatory in 1866 and went to New Zealand for the 1874 Transit of Venus expedition, where the astronomers knew it as “the brass beast”. An altazimuth instrument is a telescope with scales and mounting that allow both local coordinates - the altitude and the azimuth - of a star to be measured without the need of any additional apparatus.
A level for use with a transit instrument. The transit instrument was taken to Station D (Christchurch, New Zealand) of the Transit of Venus expeditions of 1874. The level is in a pine wood box made to fit the level exactly. The level itself is made of brass and screwed onto a mahogany mount. The scale on the level is made of paper with divisions from 20 to 0 to 20 written on in black pen.