Mr Galbraith on a New Pocket-Box Circle. 231 



Galbraith's New Pocket Box Circle. 



On a Systematic Method of Measuring Surface and Solidity. 

 By Mr JOHN SANG, Land-Surveyor, Kirkaldy.* 



IN most of the transactions relating to land, it is essential that 

 its extent be ascertained, and that its boundaries be defined by 

 permanent descriptions or representations. On correct estima- 

 tions of the extent, depend the security of the fortunes of those 

 engaged in transfers, and the success of many useful agricultu- 

 ral speculations. If the estimations be false, they may continue 

 to mislead the agriculturist, and to injure the fortunes of the 

 occupiers or proprietors for a series of years ; for, when once 

 made, they cannot be verified without complete re-measure- 

 ments, which are expensive, even when conducted in the best 

 manner. It is, therefore, of great consequence that the sur- 

 veyor's operations be conducted with accuracy and ease. The 

 object of this paper is to detail an improvement which in- 

 creases the accuracy, while it makes apparent the limit of the 

 errors, and also materially lessens the expense and labour of 

 surveying. 



The idea of reducing surveying operations to a regular sys- 



Head before the Society of Arts, 26th March 1836; Society's Honorary 

 Silver Medal awarded 7th December 1836. 



Q 2 



