4# Captain Kater's account of the 



that this standard yard may be considered as perfectly 

 correct. 



Standard Yard, No. 2. 



The mean of sixteen measurements gave the distance 

 between the lines upon the brass bars 910 divisions. This 

 standard is therefore 9 divisions, or ,00038 of an inch too 

 shortw 



Standard Yard, No. 3. 



By the mean of six measurements this standard appeared 

 to be five divisions, or ,00021 of an inch too long. 



Standard Yard, No. 4. 



The mean of ten measurements gave the error of this 

 standard five divisions, or ,00021 of an inch too short. 



Adjustment of the Standard Tards with gold points. 



The standard yards last described are intended merely for 

 the purpose of sizing those employed in commerce, and the 

 trifling differences above stated may be utterly disregarded ; 

 but the Commissioners of Weights and Measures thought it 

 desirable that accurate copies of the imperial standard yard 

 should be made, to be carefully preserved and transmitted to 

 posterity solely for the purpose of being referred to upon 

 extraordinary occasions, or upon questions important to 

 science. 



The difficulty of transferring a given distance from one 

 scale to another, is well known to all who are acquainted 

 with the subject ; the operation is one of considerable deli- 

 cacy ; and notwithstanding every precaution, is seldom abso- 



