NAT'L INST. Of, 1 3'«™ l Y, 1?f, Reference AlllDb 33TA55 NBS PubJi- cations /' \ *"»e AU O* * \ l/l a * NBS TECHNICAL NOTE 1070 U.S. DEPARTMENT OF COMMERCE / National Bureau of Standards 100 LI5753 No, 1070 1933