SS weight

RATING

100 milligrams

QUANTITY

1 milligram

2

1 gram

2

100 grams

200 grams

2 kilograms

1

2222222

Approx. 97 grams 1400-3200 F

Optical pyrometer Our previous experimental comparison had established the general type of container needed for the packages. We did, however, need several containers, and preferably of less bulk and weight than the plywood box used in the experimental comparison. Consequently, the expenditure of $500 was authorized and several thermoplastic shipping containers with polyester urethane foam permanent packing material were purchased from a commercial supplier. These have proved to be quite satisfactory and to date the damage to any components due to transportation has been superficial. Because of the time schedule established, two weeks per participant including transportation, all shipments other than local have been by air freight.

5. The Comparison Results

For the purpose of the orally presented status report, the comparison results were presented only in graphical form in terms of deviation from the reference. Measured tests values and coded identification were purposely omitted. All four routes have essentially been completed since then and all available measurement values have now been tabulated and plotted. No reference is made to the tables or graphs by number but each one is clearly titled and identified. The tabulated data shows the actual measured test values obtained by each of the participants, as identified by code number only, and also the NBS reference values for each of the comparison items.

Tabulated data is also given in terms of the deviation from the reference versus each of the coded participants for each of the comparison items, as an aid to the assimilation of these extensive data. In some instances the first NBS set of values is used as the deviation reference and in other cases the average NBS test value is used. All NBS values have been plotted in all cases to aid in reference-time identification and

to present graphical information on test item stability.

Information is also given showing the relation between the participant's expected accuracy and the deviation from the reference value. In some cases this is presented on the individual test items. In other cases it is presented only for groups of items in a given measurement technology.

6. Acknowledgements

A measurement agreement comparison of this magnitude required the cooperative effort of every member of the M.A.C. committee and their help is specifically acknowledged. The route supervisors directed all the comparison effort once the accumulated comparison packages were delivered to them. They also prepared all the tabular data and graphical presentations. The eastern low frequency route was supervised by Robert P. Heckelmann of the Sperry Gyroscope Company, Great Neck, New York. The western low frequency route was supervised by Herbert S. Ingraham, Jr., of the Radio Corporation of America, Camden, New Jersey. The high frequency route was supervised by Herbert D. Barnhart of the General Electric Company, Syracuse, New York. The mass-dimension route was supervised by William B. McCallum of the General Electric Company, Pittsfield, Massachusetts originally, but who has since transferred to Daytona Beach, Florida.

All the committee members from the National Bureau of Standards activity participated and their help is specifically acknowledged; Forrest K. Harris for his consulting assistance in the design. of the comparison packages, Joseph M. Cameron for his recommendations on the presentation of the comparison results, John S. Beers for his service as coordinator of the NBS WashingtonGaithersburg reference activity and as the coding and clearinghouse agent for test results, and to Wilbert F. Snyder for his service as the coordinator of the NBS Boulder reference activity and as the clearinghouse agent for related test results.

7. References

Richardson, S. C., Pathfinding NCSL Experiment: Nationwide Measurement Comparison, ISA Journal, Vol. 12, No. 3, 81-86 (Mar. 1965).

Youden, W. J., Graphical Diagnosis of Interlaboratory Test Results, Indus. Qual. Control, Vol. XV, No. 11 (May 1959).