Corrigenda to "A Simplified Computation of Cartesian Lens Surfaces" LUDWIK SILBERSTEIN, Kodak Research Laboratories,Eastman Kodak Company, Rochester,N. Y. (Received February 14, 1936) IN the right-hand member of Eq. (1) read (x+lo) 2 instead of (x-lo) 2 , the sign of lo in the original paper having been changed by inadvertence. This leaves Eqs. (2), (3), (4), (5), (6) unaffected, but the first term in Eq. (7) has to be replaced by ,{E +2 (x+lo)x']/[(x+1) 2 +u] 1 and the denominator (+/±') in Eq. (8) has to be replaced by (ju'-,). Further, Eq. (9) should read x"= [(-- P--( +y)] A_ A lo 11 2 4 lo' 13 / and, in Eq. (10), (A/103+'/1 3 ) has to be changed into Q/lo 2 ji'/l 2 ). The modification of (lOa) can be left to the reader, since (lOa) is only a subcase of (10), viz., for lo= oo. Independently of these simple consequences of the inversion of the sign of lo there is a typographical error in the unnumbered equation just below (la): In the right-hand member of that equation read 16n 4 instead of 16n 2 . J* 0. S. A. 25, 340 (1935). MARCH, 1936 J. 0. S. A. VOLUME 26 Recroiogp C. W. Robbins M R. C. W. Robbins was born at Bradyville, Iowa, August 24, 1875. He received his grammar school education at Humboldt, Nebraska, at which place he also finished a high school course in 1891. After having some experience in inspection work and in electrical engineering, he was employed by the Western Electric Company in October, 1905, as an inspector. It was soon apparent that his abilities were far in excess of those required for that type of work. In view of his well- founded knowledge in electrical engineering, he was pro- moted to work involving the development of inspection methods. Here he again demonstrated that his talents were in excess of those required for an individual worker and due to his supervisory and managerial ability, he rose step by step until in March, 1926, he was made Assistant Super- intendent of Inspection Engineering Development work. Mr. Robbins continued in the capacity of Assistant Superintendent on various types of engineering work until he retired from active service on August 1, 1933. Late in 1934 he was suddenly stricken by an affliction, the nature of which was never fully determined. He did not recover from this malady and died on December 13, 1934. He was survived by his widow. Mr. Robbins was elected to membership in the Optical Society in 1929. He was deeply interested in sound and light but most particularly in the latter. He was well versed in optical matters and in consequence he possessed a considerable amount of optical equipment. He was re- sponsible for the introduction of a considerable amount of optical equipment for use in inspection work associated with the manufacture of telephone equipment. W. J. TIETZ 131 J. . S. A. VOLJM E 2 6 MARCH, 1936

Corrigenda to “A Simplified Computation of Cartesian Lens Surfaces”

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Corrigenda to "A Simplified Computation of Cartesian Lens Surfaces"

LUDWIK SILBERSTEIN, Kodak Research Laboratories, Eastman Kodak Company, Rochester, N. Y.(Received February 14, 1936)

IN the right-hand member of Eq. (1) read (x+lo)2 instead of (x-lo)2, thesign of lo in the original paper having been changed by inadvertence.

This leaves Eqs. (2), (3), (4), (5), (6) unaffected, but the first term in Eq. (7)has to be replaced by

,{E +2 (x+lo)x']/[(x+1) 2 +u] 1

and the denominator (+/±') in Eq. (8) has to be replaced by (ju'-,). Further,Eq. (9) should read

x"= [(-- P--( +y)]A_ A lo 11 2 4 lo' 13 /

and, in Eq. (10), (A/103+'/1 3 ) has to be changed into Q/lo 2 ji'/l 2 ). Themodification of (lOa) can be left to the reader, since (lOa) is only a subcase of(10), viz., for lo= oo.

Independently of these simple consequences of the inversion of the sign of lothere is a typographical error in the unnumbered equation just below (la):In the right-hand member of that equation read 16n4 instead of 16n2.

J* 0. S. A. 25, 340 (1935).

MARCH, 1936 J. 0. S. A. VOLUME 26

Recroiogp

C. W. Robbins

M R. C. W. Robbins was born at Bradyville, Iowa,August 24, 1875. He received his grammar school

education at Humboldt, Nebraska, at which place he alsofinished a high school course in 1891.

After having some experience in inspection work and inelectrical engineering, he was employed by the WesternElectric Company in October, 1905, as an inspector. Itwas soon apparent that his abilities were far in excess ofthose required for that type of work. In view of his well-founded knowledge in electrical engineering, he was pro-moted to work involving the development of inspectionmethods. Here he again demonstrated that his talents werein excess of those required for an individual worker and dueto his supervisory and managerial ability, he rose step bystep until in March, 1926, he was made Assistant Super-intendent of Inspection Engineering Development work.

Mr. Robbins continued in the capacity of AssistantSuperintendent on various types of engineering work untilhe retired from active service on August 1, 1933.

Late in 1934 he was suddenly stricken by an affliction,the nature of which was never fully determined. He did notrecover from this malady and died on December 13, 1934.He was survived by his widow.

Mr. Robbins was elected to membership in the OpticalSociety in 1929. He was deeply interested in sound andlight but most particularly in the latter. He was wellversed in optical matters and in consequence he possesseda considerable amount of optical equipment. He was re-sponsible for the introduction of a considerable amount ofoptical equipment for use in inspection work associatedwith the manufacture of telephone equipment.

W. J. TIETZ

131

J. . S. A. VOLJM E 2 6MARCH, 1936