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A COMPARISON OF THE ORIGINAL FORM OF 'NEW MICROSCOPE' OF POWELL & LEALAND WITH THEIR LATER 'No 3' MODEL

MAKER: POWELL & LEALAND

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Shown in these images are the inclination positions of the 1843 model(top) and No 3(bottom). In the No 3, the tripod itself was no longer the 'stop' in the vertical and horizontal positions. This was apparently integrated inside the inclination mechanism itself. Although not visible in the images, when the No 3 was in either of the these two positions, a tiny space remains between the limb and the tripod, preventing damage to both the tripod and the limb that might have occurred in the earlier model when slammed up against the tripod. Note also that the profile of the top of the tripod was no longer round in the No 3.