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bearing of the objects was taken on the furface ; there-fore the plan’s meridian will have 20° of weft variation.

Example V.—I wifh to know- by what kind of meri-dian a plan has been conftrudted, when two objedtsthereon by its meridian form a bearing with each otherof north 3 2 ° weft, and the bearing of the fame two ob-jects, as taken on the furface by an inftrument whofeneedle has 22° of weft variation, forms a bearing witheach other of north io° weft ?

The two objects on the furface will form a bearingwith each other of north 32 0 weft by the true meridian.

Then (per rule 5th) the meridian of the plan will bethe true meridian.

Example VI.—I wilh to know the variation of aplan’s meridian, when the bearing of two objedts thereonwith its meridian is fouth 16 0 weft, and the bearing ofthe fame two objedts with each other on the furface, ta-ken by ;m inftrument whofe needle lrao 23 0 of weft va-riation, is found to be fouth io° weft ?

The plan’s meridian will have 29 0 of weft variation.

. Example VII.—I wilh to know the variation of aplan’s meridian, when the bearing of two objedts thereonwith its meridian is fouth 40° weft, and the bearing ofthe fame two objedts with each other on the furface, ta-ken by an inftrument whofe needle has 20° of weftjva-riation, is found to be fouth 23 0 weft ?

The plan’s meridian will have 6° of eaft variation.

Example VIII.—I wilh to know the variation of aplan’s meridian, when the bearing of two objedts thereon

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