Open AccessThe improved electric micrometer
Publication year - 1905
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1905.0036
Subject(s) - micrometer , reliability (semiconductor) , limit (mathematics) , diaphragm (acoustics) , measure (data warehouse) , computer science , physics , acoustics , mathematics , optics , mathematical analysis , data mining , vibration , thermodynamics , power (physics)
I.Introduction .—The electric micrometer was first used for the measurement of the amplitude of a telephone diaphragm. It was exhibited at the Royal Society Soirée in May, 1900. A succession of papers have followed in which the same principle has been applied to other measurements. The apparatus used in these last papers is in every way an advance on the first one. It is described below for the first time. The work done since 1900 has established the reliability of this method of measurement, and seems to show that the limit to its practical sensitiveness (a unit of 4 × 10-8 cm.) has been attained. It may be well, therefore, now to state in detail the form, peculiarities, and limitations of the apparatus.