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FEDERAL
VOLUME 23

O / if r E O

NUMBER 35

Washington, Wednesday, February 19, 1958

units and to permit certification of any unit that meets the requirements of the Chapter I Bureau of Mines, Depart regulations.
3. Section 25.7, paragraph e , is re ment of the Interior vised to read The firing operation must Subchapter D Electrical Equipment, Lamps, be accomplished by a removable key or Methane Detectors; Tests for Permissibility;other acceptable means to prevent ac Fees cidental or premature firing. The Bureau o f Klines Schedule 16C
words other acceptable means were substituted for any equivalent acces P art 25 M ultiple -S hot B lasting U n its sory to avoid misinterpretation that REVISION OF PROCEDURE FOR TESTING AND
only some form of key would be accept APPROVAL
able.
4. Section 25.7 paragraph g , is re There was published in the F e d e r a l vised to read The voltage must be cut off R egister of September 28, 1957 22 F. R.
7745 a notice and text of proposed re or be reduced within 15 milliseconds vision of the regulations of Subchapter 0.015 second after the firing contact is D of Title 30 Code of Federal Regulations made to such a value that no incendive prescribing requirements governing in spark an electric spark of sufficient in vestigations leading to certification for tensity to ignite flammable methane-air permissibility of Multiple-Shot Blasting mixtures can result from accidental post-firing contact of wires in the firing Units.
Interested persons were allowed 30 circuit. This change is made to guard days after publication of the notice to against the duration of electric energy submit written data, views, or arguments that could produce an electric spark ca concerning the proposed revision. Sev pable of igniting flammable methane-air eral suggestions for revision of the text mixtures, if present in the firing zone, were received pursuant to the notice. To rather than relying on the reduction of permit unlimited discussion of the sug voltage within a specified time to prevent gested changes by those who submitted such ignitions.
5. Section 25.7, paragraph i, is re them, the Bureau of Mines called a meet ing, which was held at its Central Experi vised to read The energy applied to the ment Station, Pittsburgh, Pa., on Decem firing circuit by the blasting unit shall ber 9, 1957. The meeting was attended be not less than 1.4 watt-seconds under by representatives of manufacturers of any condition of use. The phrase un blasting units and the Bureau of Mines. der any condition of use was added as a As a result of the discussion at the meet safeguard to insure that the blasting unit ing and consideration of all relevant ma produces enough energy under any con terial presented pursuant to the notice, dition of use to explode an explosive the following changes in the proposed charge and to prevent misfires.
6. Section 25.8, paragraph b , subregulations are made:
1- The title is changed as indicated paragraph 2 is deleted because it is be shove. Also throughout the text the lieved that the intended safeguard is cov word unit or units is substituted for ered adequately elsewhere in the regu device or devices as the case may be. lations. Subsequent subparagraphs of he reason for this change is to avoid paragraph b are renumbered to allow Possible conflict in interpretation befor the deletion of former subparagraph ausc for many years the term blasting 2.
7. Section 25.8, paragraph b , subvice has been associated with equipent used for breaking coal through the paragraph 4 now subparagraph 3
is revised to read Firing shall not occur discharge of high pressure gases, visa .S,ection 25.7, paragraph b , is re automatically upon operation of the de nt rea <Continued on p. 1065

TITLE 30 MINERAL RESOURCES

CONTENTS
Agricultural Marketing Service
PaSe
Proposed rule making:
Milk marketing area :
Duluth-Superior_________
Knoxville, Tenn_______________
New Orleans, L a ____________ _

1090
1090
1078

Agriculture Department See Agricultural Marketing Serv ice ; Commodity Stabilization Service.

Alien Property Office Notices:
National Savings Bank Co., Ltd.; vesting order 2 docu m ents__________

1105

Army Department See also Engineers Corps.
Rules and regulations :
Procurement;
miscellaneous amendments__________________

1066

Atomic Energy Commission Notices:
Aerojet-General Nucleonics; is suance of facility license_____
Radiation Products Co,; issu ance of temporary order and order to show cause_________

1100
1100

Civil Service Commission Notices :
Professional and scientific posi tions, certain, in continental United States; its territories and p o s s e s s i o n s except Puerto Rico ; and in foreign countries; increase in minimum rates of pay____________

1101

Commerce Department Notices:
Statement of changes in finan cial interests:
Adamson, Wallace H _________
Reid, James F., Sr____________
Williams, Robert J.; report of appointment and statement of financial interests____ ________

1100
1100
1099

Commodity Stabilization Service Notices:
Peanuts; Agricultural Stabiliza tion and Conservation State Committee, California:
Closing dates .________ - ____
Redelegation of final au thority _____________________
1063

1099
1099