Electrical Measuring Instruments
a Complete Catalogue of Electrical Measuring and Test Instruments
Hartmann & Braun

This edition of our catalogue is far larger than our previous issues. Our endeavours to keep pace with all the improvements in Science and Practice, and our wish to facilitate the selection of the most suitable instrument for whatever purpose required, by furnishing a slight description of the necessary manipulation, have led to this increase; which we hope will cause this catalogue to serve as a book of reference when using the instruments described.

With the exception of the copies of Standards of the Imperial Physico-Technical Laboratory, nearly all our instruments have been entirely designed by our firm and their associates. The usual standard types of apparatus have been remodelled and improved, to bring them up to the present day requirements for measuring instruments. Some of Prof. Kohlrausch's valuable designs have also been remodelled in accordance with his suggestions; we have always made it our special endeavour in improving and remodelling our instruments, to make them as simple and convenient as possible, so that they may be used by comparatively unskilled hands without loss of time; and for this reason we have originated several direct reading instruments, to which we would especially draw the attention of all practical engineers.

Especial care is given to the calibration, adjustment and exact determination of Constants, for which purpose we have a very complete and carefully designed plant, comprising 4 Dynamos for direct currents up to 1500 amperes, three sets of large accumulators and one set of several hundred small ones also capable of discharging at the rate of 2000 amperes and at potentials up to 800 volts, in addition to a direct current motor transformer for potentials up to 2000 volts and electrostatic arrangements for higher potentials. For alternating current work within very wide limits, an alternating current dynamo with 3 transformers having a range up to 1000 amps and 10000 volts is employed.

Whilst using our very best endeavours to meet all the requirements of accuracy, convenience, and mechanical perfection in design, it will still sometimes occur that every day use of our instruments will suggest points in which improvements are possible; and we shall be extremely obliged for any such suggestions.

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