Meafiiremenl of a Bafe on Hounflow^Heatli, 4-^5 



Meafurcment of the Bafe with the Deal Rods, 

 Tab. XVI. and XVIII. 



Such extraordinary care and pains had been befrowed in the 

 cbnftrudion of the deal rods, in order to render them the beil: 

 which had ever been made, that, although begun early in 

 June, they were liot completely jfinifhed before the 1 «jth of 

 July. They were brought that afternoon by Mr. Ramsden, 

 together with the various parts of the apparattis neceffary for 

 their application in the field, to the camp now moved from 

 Hanworth Summer-houfe to the interfedion of the bafe with 

 Wolfey River ; whence they were tranfported, early next 

 morning, to the pipe near Hampton Poor-houfe, where we 

 were met by Sir Joseph Banks, accompanied by Meff. Blag- 

 den, Cavendish, Lloyd, and Smeaton, all ready to lend 

 their affiflance in the fubfequent menfuration. 



Before I proceed farther, 1 think it here incumbent upon 

 me very gratefully to remark, that the refpe£lable and very 

 worthy Prefident of the Royal Society, ever zealous in the 

 caufe of fcience, and who had repeatedly viiited the heath, to 

 offer aid, if fuch had been neceffary, while the firft and 

 rougher part of the operations were going on ; now, that others 

 of a more delicate nature were to commence, and where it was 

 of importance, that thofe entrufled with the execution fliould 

 meet with as few, and as fliort, interruptions as poffible, not 

 only gave his attendance from morning to night in the field, 

 during the whole progrefs of the work ; but alfo, with that 

 liberality of mind which diftinguifhes all his a-flions, ordered his 

 ^nts to be continually pitched near at hand, where his immediate 



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