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The production of eastern Kentucky crude oils
690
BODK
NOTICES.
[J. F. I.
Weller Manufacturing Company, Catalogue No. 35-D, Spiral Conveyors. cago, Illinois, no date. (From the Company.) Philadelphia, Pennsylvania, Wirt Company, Dim-A-Lite Catalogue. (From the Company.) Wittenmeier Machinery Company, Catalogue of Refrigerating Apparatus. cago, Illinois, no date. (From the Company.)
BOOK
Chi1921. Chi-
NOTICES.
NATIONAL
ADVISORYCOM~~ITTEEFOR AEKONAUTICS. Report No. 117, The Drag of Zeppelin Airships, by Max M. Munk. II pages, diagrams, quarto. Washington, Government Printing Office, 1921. This is a discussion of the results of tests with Zeppelin airships, in which the propellers were stopped as quickly as possible while the airship was in full flight. In this paper the author refers to the theory involved in these tests and to one scientifically interesting fact which can be derived from them and which has not yet been noted. The chief general question concerning these tests is, of course: Does the negative acceleration of an airship with stopped propellers supply proper data for determining the drag of the airship when in uniform flight? This can not absolutely be answered in the affirmative, the two phenomena not being identical in principle. It is believed, however, that in this particular case the agreement is sufficient and that the data obtained from the test are the true or, at least, the approximate quantities wanted. Report No. 121, The Minimum Induced Drag of Aerofoils, by Max hi. Munk. 18 pages, quarto. Washington, Government Printing Office, 1921. The paper contains some theorems concerning the arrangement of airplane wings which are of considerable practical interest. In particular, it shows the theoretical reasons for the decrease of drag which accompanies all increases in the aspect ratio or lateral extension of a wing. The efficiency of a given arrangement of wings may be calculated from the formulae derived in this paper. THE
PRODUCTION OF EASTERN KENTCCKY CRUDE OILS. By Willard Rouse Kentucky, The CumberJillson. Pamphlet, &vo., gg pages. Winchester, land Pipeline Company, 1921. Private edition. This is principally devoted to statistics of the production of wells in the eastern third of Kentucky, with comments, especially a discussion of the question of depletion. Several pages of prefatory matter give details of the oilproducing sands. The locations of the pools are indicated by a map. Oil supply is now such an important question that all exact information is welcome. HENRY LEFFMANN.
A TEXT-BOOKOF PHARMACOGNOSY. By Heber W. Youngken, Ph.M., Ph.D., Professor of Botany and Pharmacognosy and Director of the Botanical Garden of the Philadelphia College of Pharmacy and Science. 8vo., 5og pages, contents, index and 350 illustrations. Philadelphia, P. Blakiston’s Son and Company. Price $6.00 net.
BODK
NOTICES.
[J. F. I.
Weller Manufacturing Company, Catalogue No. 35-D, Spiral Conveyors. cago, Illinois, no date. (From the Company.) Philadelphia, Pennsylvania, Wirt Company, Dim-A-Lite Catalogue. (From the Company.) Wittenmeier Machinery Company, Catalogue of Refrigerating Apparatus. cago, Illinois, no date. (From the Company.)
BOOK
Chi1921. Chi-
NOTICES.
NATIONAL
ADVISORYCOM~~ITTEEFOR AEKONAUTICS. Report No. 117, The Drag of Zeppelin Airships, by Max M. Munk. II pages, diagrams, quarto. Washington, Government Printing Office, 1921. This is a discussion of the results of tests with Zeppelin airships, in which the propellers were stopped as quickly as possible while the airship was in full flight. In this paper the author refers to the theory involved in these tests and to one scientifically interesting fact which can be derived from them and which has not yet been noted. The chief general question concerning these tests is, of course: Does the negative acceleration of an airship with stopped propellers supply proper data for determining the drag of the airship when in uniform flight? This can not absolutely be answered in the affirmative, the two phenomena not being identical in principle. It is believed, however, that in this particular case the agreement is sufficient and that the data obtained from the test are the true or, at least, the approximate quantities wanted. Report No. 121, The Minimum Induced Drag of Aerofoils, by Max hi. Munk. 18 pages, quarto. Washington, Government Printing Office, 1921. The paper contains some theorems concerning the arrangement of airplane wings which are of considerable practical interest. In particular, it shows the theoretical reasons for the decrease of drag which accompanies all increases in the aspect ratio or lateral extension of a wing. The efficiency of a given arrangement of wings may be calculated from the formulae derived in this paper. THE
PRODUCTION OF EASTERN KENTCCKY CRUDE OILS. By Willard Rouse Kentucky, The CumberJillson. Pamphlet, &vo., gg pages. Winchester, land Pipeline Company, 1921. Private edition. This is principally devoted to statistics of the production of wells in the eastern third of Kentucky, with comments, especially a discussion of the question of depletion. Several pages of prefatory matter give details of the oilproducing sands. The locations of the pools are indicated by a map. Oil supply is now such an important question that all exact information is welcome. HENRY LEFFMANN.
A TEXT-BOOKOF PHARMACOGNOSY. By Heber W. Youngken, Ph.M., Ph.D., Professor of Botany and Pharmacognosy and Director of the Botanical Garden of the Philadelphia College of Pharmacy and Science. 8vo., 5og pages, contents, index and 350 illustrations. Philadelphia, P. Blakiston’s Son and Company. Price $6.00 net.