Cased George IV Altazimuth Theodolite by Alexander Adie of Edinburgh RB Bate the onset of the more

the onset of the more agile aneroid barometer put pay to the success of many of these fascinating instruments and they are therefore seldom encountered

electrometers

It was my aim to portray that most fascinating of instruments – the barograph – using illustrations as examples of the many different types still available

they are covered with an amalgam of mercury

John Dollond’s invention of the achromatic lens (although bitterly disputed) led to his award of the Copley Medal by The Royal Society in 1758 and following this success

Cased George IV Altazimuth Theodolite by Alexander Adie of Edinburgh RB Bate the onset of the moreFor sale, a cased George IV altazimuth theodolite by Alexander Adie of Edinburgh. This rare example is comprised of a horizontal five inch divided circle which is coarse adjusted by hand and then finely adjusted by means of a knurled brass knob attached to top. The centre contains an expertly engraved and silvered compass with a small brass cam to the side of the case, to hold or release the movement. Two sides of the outer edge of the base are also