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Inv. 62524 - parts and operation

To remove the top lid slide towards the objective lens and away from the viewing screen; it sticks otherwise. The lid carries both LIX and DLXII in the centre. Most if not all other examples, such as that at the Boerhaave Museum and the Science Museum London, have the Royal Arms in brass on top in the centre of the lid. From the remaining hole on our example, it has evidently been removed.

The front cover can be slid upwards out of its dovetailed slide; it is marked LIX. A '12' clockwinding key can be used to move the objective lens. Note that three contiguous components of the mount for the objective are numbered LIX, and the whole objective assembly can be pushed forward and backward within the outer draw - it is held friction-tight rather than being fixed in place. There are two brass components in the outer draw which could be used to attach another cover of some kind over the objective.

The metal shade is lacking one of its fixing pins and its black paint is scraped in various places.

The back cover slides up and when removed the end frame piece for the ground glass screen can be removed, along with the screen itself to deliver a much clearer and sharper image. The cover has a slot cut for a now missing lock; it also has LIX.

There is a dovetailed slot on the bottom which suggests that the instrument could be slid onto a mount or stand. There is also a brass component let in to the bottom, perhaps for locating (cf the similar pair on either side of the objective lens). The number LIX is also cut into the bottom.

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