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Metric scales for architects, engineers and surveyors
Books Code of practice promotes electrical safety on building sites A code of practice produced by the British Standards Institution on the installation and use of equipment for the distribution of electrical power supplies during construction work, CP 1017: 'Distribution of electricity on construction and building sites,' follows the publication last year of BS 4363, which specifies the design and construction of electrical distribution equipment suitable for use under the arduous conditions experienced on building sites. The code gives guidance on the correct usage of this special-purpose equipment and, in addition, states what is good practice for installations operating at voltages up to medium voltage (650 V). A precaution which has major safety implications is the colour coding of socket-outlets and couplers which is specified for each operating voltage.
Metric scales for architects, engineers and surveyors BS 1347: 'Architects, engineers and surveyors scales,' Part 3, Metric scales, specifies the combinations of scales on rules intended for general use and lays special emphasis on the design of scale rules used for detail work. It is mainly concerned with fully divided scales; however, a short series of open divided scales has been included for it is thought in some industries that these have some advantage when taking a dimension from a drawing rather than a plotting. The physical dimensions of the metric scale rules are similar to those already in existence for the imperial system. For experienced users familiar with the sizes of scale rules it is felt that any alteration in length would be an unnecessary inconvenience. A colour code is introduced to identify scale types, but the use of this method of identification is not mandatory.
which is now published, deals with scales of finer resolution where quickness of reading is not a criterion and overlaps some of the scales in Part 1. The recommendations are applicable only to single scale single range dials with full circle, part circle or straight scales as defined, but are not intended to relate to transilluminated dials, moving scales, fixed index instruments or to scales which have substantially non-linear characteristics. The relationship of scale dimensions, to reading distance is given and discussed in detail as well as preferred scale ranges.
Safety of refrigeration plant Safety requirements in connection with refrigeration plant, for protecting personnel and preventing damage to premises, can now be studied conveniently in BS 4434: 'Requirements for refrigeration safety'. This publication draws attention to dangers which may arise in connection with refrigeration installations and to give methods of minimizing these, either by direct recommendation or by reference to relevant standard pressure vessel and piping codes, electrical codes and regulations, factory and fire regulations. BS 4434 takes into account recent work on this subject in the field of international standardization. It is applicable both to new refrigerating plant and to extensions or modifications to existing plant; but is intended solely to minimize possible hazards peculiar to refrigeration plant and does not constitute a design manual. This standard is expressed in SI units, but approximate British unit equivalents are also given. Copies of the British Standards listed above may be obtained from BSI Sales Branch, 101/113 Pentonville Road, London N.1. Prices are as follows: CP 1017, 12s; BS 1347, 10s; BS 1749, 10s; BS 3693, 14s; BS 4434, 16s.
The metrication of energy
Metric revision of air pollution measurement All four parts of BS 1749 'Methods for the measurement of air pollution' have now been revised in metric units. No change in the technical details has been made except for slight adjustments in the calculations which are necessary to relate the results to the new units. The parts of this standard are: Part 1 : 1969 'Deposit gauges.'
A new aid for those concerned with the introduction of metrication becomes available with the publication by the Ministry of Technology of a report on the first national conference on the introduction of International System (SI) Units in the gas, oil, electricity and other energy industries. Copies of the report "Proceedings of the National Conference on the Change to the International System (SI) Units for Energy" may be obtained from the Ministry of Technology, Station Square, St. Mary Cray, Orpington, Kent, BR5 3RE - Price 22s 6d.
Part 2:1969 'Determination of concentration of suspended matter.' Part 3:1969 'Determination of sulphur dioxide.'
Training research register
Part 4:1969 'The lead dioxide method.'
The new edition of the Department of Employment and Productivity's Training Research Register* published in December lists over 300 current and recently completed projects. The main purpose of the register is to enable training specialists to keep themselves informed about the range of research in training.
The design of scales and indexes The first part of BS 3693: 'Recommendations for the design of scales and indexes,' was devoted to instruments of bold presentation and for rapid reading. Part 2:1969, 'Indicating instruments to be read to 0.33 - 1.25% resolution,'
182
Applied Ergonomics June
1970
* Training Research Register (third edition; 1969) HM Stationery Office, price 12s 6d.
Metric scales for architects, engineers and surveyors BS 1347: 'Architects, engineers and surveyors scales,' Part 3, Metric scales, specifies the combinations of scales on rules intended for general use and lays special emphasis on the design of scale rules used for detail work. It is mainly concerned with fully divided scales; however, a short series of open divided scales has been included for it is thought in some industries that these have some advantage when taking a dimension from a drawing rather than a plotting. The physical dimensions of the metric scale rules are similar to those already in existence for the imperial system. For experienced users familiar with the sizes of scale rules it is felt that any alteration in length would be an unnecessary inconvenience. A colour code is introduced to identify scale types, but the use of this method of identification is not mandatory.
which is now published, deals with scales of finer resolution where quickness of reading is not a criterion and overlaps some of the scales in Part 1. The recommendations are applicable only to single scale single range dials with full circle, part circle or straight scales as defined, but are not intended to relate to transilluminated dials, moving scales, fixed index instruments or to scales which have substantially non-linear characteristics. The relationship of scale dimensions, to reading distance is given and discussed in detail as well as preferred scale ranges.
Safety of refrigeration plant Safety requirements in connection with refrigeration plant, for protecting personnel and preventing damage to premises, can now be studied conveniently in BS 4434: 'Requirements for refrigeration safety'. This publication draws attention to dangers which may arise in connection with refrigeration installations and to give methods of minimizing these, either by direct recommendation or by reference to relevant standard pressure vessel and piping codes, electrical codes and regulations, factory and fire regulations. BS 4434 takes into account recent work on this subject in the field of international standardization. It is applicable both to new refrigerating plant and to extensions or modifications to existing plant; but is intended solely to minimize possible hazards peculiar to refrigeration plant and does not constitute a design manual. This standard is expressed in SI units, but approximate British unit equivalents are also given. Copies of the British Standards listed above may be obtained from BSI Sales Branch, 101/113 Pentonville Road, London N.1. Prices are as follows: CP 1017, 12s; BS 1347, 10s; BS 1749, 10s; BS 3693, 14s; BS 4434, 16s.
The metrication of energy
Metric revision of air pollution measurement All four parts of BS 1749 'Methods for the measurement of air pollution' have now been revised in metric units. No change in the technical details has been made except for slight adjustments in the calculations which are necessary to relate the results to the new units. The parts of this standard are: Part 1 : 1969 'Deposit gauges.'
A new aid for those concerned with the introduction of metrication becomes available with the publication by the Ministry of Technology of a report on the first national conference on the introduction of International System (SI) Units in the gas, oil, electricity and other energy industries. Copies of the report "Proceedings of the National Conference on the Change to the International System (SI) Units for Energy" may be obtained from the Ministry of Technology, Station Square, St. Mary Cray, Orpington, Kent, BR5 3RE - Price 22s 6d.
Part 2:1969 'Determination of concentration of suspended matter.' Part 3:1969 'Determination of sulphur dioxide.'
Training research register
Part 4:1969 'The lead dioxide method.'
The new edition of the Department of Employment and Productivity's Training Research Register* published in December lists over 300 current and recently completed projects. The main purpose of the register is to enable training specialists to keep themselves informed about the range of research in training.
The design of scales and indexes The first part of BS 3693: 'Recommendations for the design of scales and indexes,' was devoted to instruments of bold presentation and for rapid reading. Part 2:1969, 'Indicating instruments to be read to 0.33 - 1.25% resolution,'
182
Applied Ergonomics June
1970
* Training Research Register (third edition; 1969) HM Stationery Office, price 12s 6d.