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The item is a 6 inch transit circle. The transit circle is an instrument used to determine the declination of stellar onjects. It consists of a circular scale kept perpendicular to the rotating axis of a telescope tube.

This item was a optical instrument named as Stereoscope. Stereoscopes are apparently those optical devices that help to view the two images separately and with relaxed eyes. There are two types of stereoscopes as: lens or pocket stereoscopes and mirror stereoscopes. Lens or pocket stereoscopes are great for viewing the whole overlap area of prints up to 9 cm × 13 cm or parts of larger patterns. On the other hand, mirror stereoscopes were designed to accept standard 23 cm × 23 cm metric air photos and work well with A4/US letter-sized prints. Most models come with magnifying options up to eight times, which is pretty impressive. One cool thing about mirror stereoscopes is that they are large enough to allow the analyst to draw beneath them, so it is possible to trace objects identified in the stereoview with a pen onto one of the images or a transparent overlay. However, it's important to remember that this sketch wouldn't have the geometric properties of a map as it contains all distortions present in the base image.

This item was about the map of part of the environs of Madras showing the relative positions of the Observatory house station and the guns. This map was made by J.Goldingham who was F.R.S. in Madras Observatory and the map was published in Madras Observatory papers in 1826 on page no. 177.

This item was about the Goldingham working with a Kater's Pendulum hung in front of a haswell clock in the Observatory. The second assistant Thiruvenkatachary, is reading the clock, while the first assistant Srinivasachary, sitting near the 18 ft granite pier, is noting down the reading.

This item was about the page from M.S. Records stating that the Madras Observatory was established in 1786. The Madras Observatory was first was established in 1786.

Madras and Kodaikanal Reports for the years 1898-1921, except 1899-1900 annual report.

Astronomical Observations Madras, 1792-94 was known as the "Annual Report of 1792". The manuscript volume was divided into three parts. The first part gives a detailed description of the observatory building supplemented with 12 hand-coloured figures of the various sections of the building. Figure 1 is the picture of the Madras Observatory. Parts 2 and 3 record the observations taken for the years 1793 and 1794, respectively.