Summarize the following court judgment. APPEAL NO. 691 of 1976. (From the Judgment & Order dated the 16th December 1975 of the Gujarat High Court in Special Civil Appln. No. 572 of 1975). G.L. Sanghi and Girish Chandra	 for the Appellants. 480 V.M. Tarkunde	 K.L. Hathi and Mrs. P.C. Kapur	 for respondent No. 1. The Judgment of the Court was delivered by GOSWAMI	 J. This appeal on certificate is from the judgment of the High Court of Gujarat. The appellants 1 and 2 are respectively the Union of India and the Regional Provident Fund Commissioner. Dhrangadhra Chemical Works Kamdar Sangh (hereinafter to be described as the union) is the first respondent. The second respondent is Dhrangadhra Chemical Works (hereinafter to be described as the employer). With respect to the dearness allowance (D.A.) of the workers under the employer there was a reference No. 70/70 before the Industrial Tribunal at Ahmedabad. The parties arrived at a settlement of the said industrial dispute and an award was passed in terms of the settlement. According to the award the employer was to pay D.A. to its employees at the rate of the quarterly average cost of living index as settled by the Simla Bureau	 popularly known as "All India Consumers Price Index" for the relevant quarter. Thus for the 'months of January	 February and March	 1974	 the rate of D.A. was on the basis of the average cost of living index for the months of July	 August and September 1973 as pub lished by the said Bureau and this was to follow for every quarter. It is the accepted position that for the months of April	 May and June 1974 the D.A. worked out at Rs. 78/ per month	 but for the quarter. commencing on 1st July	 1974	 and ending on 30th September	 1974	 it worked out at Rs. 88.50 per month. In other words	 it was an agreed position between the union and the employer that the rate of D.A. payable to all the workers from 1st July	 1974	 was at the rate of Rs. 88.50 per month. With effect from 6th July	 1974	 The Additional Emolu ments (Compulsory Deposit) Ordinance 1974 came into force. This Ordinance was replaced by The . (Act No. 37 of 1974) (briefly the Act) and the Act is deemed to have come into force on the 6th day of July 1974. We have already made a detailed reference to the aim and object of the Act and also dealt with the material provi sions thereof in dealing with a similar question in Civil Appeal No. 690 of 1976 in which we have delivered our judg ment to day(1). It is	 therefore	 not necessary to repeat those observations here. The short question that arises in this particular appeal turns on the Explanation I to section 2(b) of the Act. We will	 therefore	 read that provision: "2(b) 'additional dearness allowance ' means such dearness allowance as may be sanc tioned from time to time	 after the appointed day	 over and above the amount of dearness allowance payable in accordance with the rate in force immediately before the date from which such sanction of additional dearness allowance is to take effect. (1) [1977] 2 S.C.R.472. 481 Explanation I. Where payment of dearness allowance is linked to a cost of living index or any other factor	 any automatic payment	 after the appointed day	 of dearness allowance in consequence of any rise in such cost of living index or in consequence of any change in such other factor shall	 notwithstanding the provisions of this clause	 be deemed to be the additional dearness allowance. " It is clear under section 2(b) that additional D.A. has to be sanctioned after the appointed day. "Sanctioned" is the heart of the definition clause. Since additional D.A. is defined to mean such D.A. as may be sanctioned from time to time after the appointed day	 Explanation I 'to the definition is inserted to. deal with a situation to avoid any controversy about the sanction while there is an auto matic rise in D.A. linked to a cost of living index. Where D.A. is linked to a cost of living index any automatic payment	 after the appointed day	 of D.A. in consequence of any rise in such cost of living index shall be deemed to be the additional D.A. In the absence of Explanation I there would have been scope for controversy whether additional D.A. which is paid automatically with the rise in the cost of living index	 as agreed upon	 can be said to be D.A. sanctioned from time to time. Such a controversy is set at rest by insertion of Explanation I which is a deeming clause. The question that arises for consideration in this appeal is whether the rise in the cost of living index has also got to be after the appointed day. The union contends that the D.A. of Rs. 88.50 which is payable from 1st of July	 1974	 for the quarter 1st July	 1974 to 30th Septem ber	 1974 is an pursuance of the rise of cost of living index between January to March 1974 which is prior to the appointed day	 namely	 6th July	 1974. It is	 therefore	 submitted that no additional D.A. is deductible under the Act. The High Court has accepted the contention of the union and allowed the application under Article 226 of the. Con stitution granting a Mandamus restraining the employer from deducting additional D.A. from the emoluments of the em ployees. The High Court also granted certificate to appeal to this Court. it is common knowledge that when D.A. is linked to a cost of living index	 actual determination of the D.A. takes place after the index is published and known. The index	 therefore	 is always of a past period by the yardstick of which D.A. is adjusted. This being the concept about link age of D.A. to cost of living index	 Explanation I makes it clear that when payment of D.A. is linked to a cost of living index any automatic payment after the appointed day of D.A. in consequence of any rise in the cost of living index shall. notwithstanding the provisions of this clause	 be deemed to be the additional D.A. The non obstante clause in the Explanation takes note of the definition clause where sanction after the appointed day has been mentioned. Explanation I therefore	 plays its role	 not withstanding whatever is stated in section 2(b)	 the definition clause. We do not find anything in Explana tion I to warrant the conclusion that rise of the cost of living index should be after the appointed day. What is to be after the appointed day is "any automatic payment of D.A. in consequence of any 482 rise . "and not that any rise in the cost of living index should be after the appointed day. We are	 therefore	 unable to agree with the High Court that the rise of cost of living index also should be after the appointed day. It is sufficient for the purpose of Explanation I if payment of D.A.	 in consequence of rise of cost of living index	 takes place after the appointed day on account of rise in the cost of living index even prior to the appointed day. The nexus for the purpose of Explana tion I is with the payment after the appointed day and not with the rise in the cost of living index. The specified percentage of additional D.A. which is 50% of the rise	 being the difference	 between Rs. 78/ and Rs. 88.50 is	 therefore	 deductible under section 6(2)(b) of the Act and the High Court was not correct in holding to the contrary. The appeal is allowed and the judgment of the High Court is set aside. There will be	 however	 no order as to costs. P.B.R. Appeal allowed.

Section 2(b) of the defines additional dearness allowance to mean such dearness allowance as may be sanctioned from time to time after the appointed day over and above the amount of dearness allowance payable in accordance with the rate in force immediately before the date from which such sanction of additional dearness allowance is to take effect. Expla nation I to the clause states that where payment of dearness allowance is linked to the cost of living Index any auto matic payment after the appointed day of dearness allowance in consequence of any rise in such cost of living index or in consequence of any change in such other factor shall	 notwithstanding the provisions of this clause	 be deemed to be the additional dearness allowance. Dearness allowance was paid to the employees of the respondent at the rate of quarterly average cost of living index for the relevant quarter. The rate of dearness allow ance for one quarter e.g. the first quarter of 1974 was paid on. the basis of the average cost of living index for the months of July September	 1973. For the quarter July September	 1974 there was a rise in the cost of living index and consequently there was a rise in the dearness allowance payable to the employees. In a writ petition under article 226 of the Constitution the employees contended that the increased dearness allowance payable for the quar ter July September	 1974 was as a result of rise in the cost of living index between January March	 1974 which was before the appointed day in July 6	 1974 and	 therefore	 no additional dearness allowance was deductible under the Act. The High Court granted the writ. Allowing the appeal	 HELD: The High Court was wrong in its view that the rise of cost of living index should be after the appointed day. The nexus	 for the purpose of the explanation	 is with the payment after the appointed day and not with the rise in the cost of living index. There is nothing in the Explanation to warrant the conclusion that rise in the cost of living index should be after the appointed day. What is to be after the appointed day is any automatic payment of dearness allowance in consequence of any rise in such cost of living index and not that any rise in the cost of living index should be after the appointed day. [482B: 481H] When D.A. is linked to the cost of living index	 actual determination of the D.A. takes place after the index is published and known. The index	 therefore	 is always of a past period by the yard stick of which D.A. is adjusted. This being the concept about linkage of D.A. to cost of living index. Explanation I makes it clear that when pay ment of D.A. is linked to cost of living index any automatic payment after the appointed day of D.A. in consequence 'of any rise in the cost of living index shall	 notwithstanding the provisions of this clause	 be deemed to be the addition al D.A. [481G]