The gold-cobalt and a#39;normala#39; silver had been hard-drawn to a diameter of 0 005 in. from a bar of about 1 in. diameter. They were ... The reference metal and extension wires were instrument grade copper obtained from Leeds and Northrup Co., anbsp;...
|Title||:||Precision measurement and calibration|
|Author||:||J. F. Swindells|