. Annual report 1919. sand Regulations of the Commission for such work. More than one hundredapproval cards have been issued the result of a corresponding number of approval 276 TWELFTH ANNUAL REPORT OF THE No. 49 reports completed during this period. This does not include a much larger numberof preliminary letter reports to the submittors of devices which have for variousreasons been criticized for the purpose of bringing these devices up to the standardrequirements. There has been some change made in the method of procedure for approvalof electrical material, etc., and also in that for the f
. Annual report 1919. sand Regulations of the Commission for such work. More than one hundredapproval cards have been issued the result of a corresponding number of approval 276 TWELFTH ANNUAL REPORT OF THE No. 49 reports completed during this period. This does not include a much larger numberof preliminary letter reports to the submittors of devices which have for variousreasons been criticized for the purpose of bringing these devices up to the standardrequirements. There has been some change made in the method of procedure for approvalof electrical material, etc., and also in that for the follow-up service. Thesechanges are now embodied in what is known as The Eules and Specifications fortest and approval of Electrical Material Devices and Fittings which were approvedof by the Commission in March, 1919, and have since been issued in the form ofa printed looseleaf book. Thirteen specifications are attached to this first edition,all having been adopted almost in their entirety from the Code for Electrical. Endurance Testing Machine for approval tests of key sockets and snap switches. —Approval Laboratory. Appliances issued by the Underwriters Laboratories. These specifications donot cover a large proportion of the work passing through this laboratory and ithas therefore, been necessary to supplement them by others of a tentative natureas will be noted below. The data for the preparation of some of these tentativespecifications has already been collected by the laboratory engineers. Tn order that the findings of the Approval Laboratory might be checked andsupplemented by the experience of others it was deemed advisable by the ChiefEngineer to appoint a Committee on Approval of Electrical Material, etc., whichwould act purely in an advisory capacity with the laboratory engineers in makingrecommendations to the Commission. The personnel of the Committee includesrepresentatives from various electrical associations, engineering bodies, and tradeorganizations, from the
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