ISSN:0035-9009    

DOI:10.1002/qj.49706728802

出版商:John Wiley&Sons, Ltd    

年代:1941

数据来源: WILEY

摘要:

AbstractThe paper includes statistics of the general monthly rainfall over the British Isles, both in inches and as percentages of the average, for the seventy years 1870‐1939. The general trend of the variations is shown by diagrams of ten‐year means for each month, based on the similar statistics for England and Wales, Scotland and Ireland separately. Similar diagrams are given to show the variations for the winter half‐year, summer half‐year and seasonal year sep

ISSN:0035-9009    

DOI:10.1002/qj.49706728803

出版商:John Wiley&Sons, Ltd    

年代:1941

数据来源: WILEY

ISSN:0035-9009    

DOI:10.1002/qj.49706728804

出版商:John Wiley&Sons, Ltd    

年代:1941

数据来源: WILEY

摘要:

AbstractAn account is given of a new weight barograph which resembles that of Sprung in principle but differs almost entirely in detail. Its mechanism is driven electrically, and provides not only a clear graphical trace of the pressure but a printed numerical record of its value every hour. The usefulness of this lies not so much in facilitating the abstraction of the data from the charts as in adding materially to the accuracy, for changes in humidity have a decided effect on the width of the paper, and may under extreme conditions cause an error of a millibar in the trace.The barometric tube and a counterweight hang from the ends of a beam, pivoted a t its centre, and on the beam is a rolling weight; when the beam is slightly tilted by a change of pressure a contact is made which through a sensitive relay brings into operation an electric motor. This moves the rolling weight until equilibrium is again reached and the position of the rolling weight controls both the trace and the number printed.After a discussion of the fundamental principles the mode of construction is described in some detail, and finally the methods of adjustment and the compensation for temperature.

ISSN:0035-9009    

DOI:10.1002/qj.49706728805

出版商:John Wiley&Sons, Ltd    

年代:1941

数据来源: WILEY

摘要:

AbstractThe data from three more large drainage areas are examined by the same method as in the former paper on this subject. The results show again that the variations in loss can be largely associated with variations in rainfall and temperature. It is also demonstrated that, with similar climatic conditions, the loss increases as the sub‐surface has increasing permeabilit

ISSN:0035-9009    

DOI:10.1002/qj.49706728806

出版商:John Wiley&Sons, Ltd    

年代:1941

数据来源: WILEY

摘要:

AbstractAfter stating the need for precise drought data as the basis for the formulation of sound economic schemes of insurance of stock and crops against losses arising from drought, the author outlines methods by which all the requisite essential data can be derived from lengthy meteorological records :‐(I) In precise month‐to‐month detail, with regard to all the major droughts of a review period, by means of isodef charts showing equal percentage deficiency, and (2) in general detail for the whole review period, which is limited only by the availability of an adequate supply of reliable continuous meteorological records, by means of isnagdef charts (showing equal aggregate deficiency); these, being few in number, do not involve so much labour as the production and investigation of isodef charts for each month of the period of review.Three typical isoagdef charts for S.E. Queensland, covering the pyear period 1886‐1935, together with sample data used in their preparation, are given in illustration of the method.It is also pointed out that the statistical data and charts are of material value in selecting reserve agistment areas, or in deciding as to the leasehold or freehold values of pastoral and farming properties in recurrent drough

ISSN:0035-9009    

DOI:10.1002/qj.49706728807

出版商:John Wiley&Sons, Ltd    

年代:1941

数据来源: WILEY

ISSN:0035-9009    

DOI:10.1002/qj.49706728808

出版商:John Wiley&Sons, Ltd    

年代:1941

数据来源: WILEY

ISSN:0035-9009    

DOI:10.1002/qj.49706728809

出版商:John Wiley&Sons, Ltd    

年代:1941

数据来源: WILEY

ISSN:0035-9009    

DOI:10.1002/qj.49706728810

出版商:John Wiley&Sons, Ltd    

年代:1941

数据来源: WILEY

ISSN:0035-9009    

DOI:10.1002/qj.49706728811

出版商:John Wiley&Sons, Ltd    

年代:1941

数据来源: WILEY