DIY History | Transcribe | Scholarship at Iowa | Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no.26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903 | Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no. 26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903, Page 48

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Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no.26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903

Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no. 26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903, Page 48

estimates ac in tenths of ab. Then these tenths are to be added to the whole number of seconds counted at a, to express the time of transit. Thus if the observer counts 23 seconds at a and estimates that from a to c is 0.4 of ab, the time of transit according to his estimation is 23.4[superscript]s[/superscript].
   A good way for a beginner to observe to half seconds in connection with the clock is to count by halves, thus:-- one, half, two, half, etc.
   "It is conducive to accuracy for the observer to acquire the habit of deciding definitely, at once, without hesitation, upon the second and tenth as soon as the event is complete."
   The "eye and ear" method is used for nearly all purposes. It is best to use this method in making the azimuth adjustments, the chronograph being unnecessary for this purpose. Five or seven wires are usually employed in the "eye and ear" method.
   The telescope should be set for a given

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estimates ac in tenths of ab. Then these tenths are to be added to the whole number of seconds counted at a, to express the time of transit. Thus if the observer counts 23 seconds at a and estimates that from a to c is 0.4 of ab, the time of transit according to his estimation is 23.4[superscript]s[/superscript]. A good way for a beginner to observe to half seconds in connection with the clock is to count by halves, thus:-- one, half, two, half, etc. "It is conducive to accuracy for the observer to acquire the habit of deciding definitely, at once, without hesitation, upon the second and tenth as soon as the event is complete." The "eye and ear" method is used for nearly all purposes. It is best to use this method in making the azimuth adjustments, the chronograph being unnecessary for this purpose. Five or seven wires are usually employed in the "eye and ear" method. The telescope should be set for a given