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George,

Don't bother with the book from 1987. It does not contain any technical
information on instruments whatsoever. There is some in the one by
Schaafhausen, Hoffmann and Kaltenbach from 1962, but this you already
know. (Plath published one book at the occasion of  their 100 year
aniversary in 1962, and another one at their 150 year anniversary in
1987.)

Have you checked the original book by Randier to make sure there is no
translation or printing error in the date?

Herbert


George Huxtable wrote:

>I wonder if anyone has a copy of, or has easy access to, "From sextant
>to satellite navigation", by Friedrich Jerchow, which was published in
>1987, in English and in German?
>
>The question that I am trying to resolve was asked a long time ago on
>the old Nav-l mailing list and still awaits a proper answer. It is
>this: "When, and by whom, was the first true micrometer sextant
>introduced?"
>
>Jean Randier, in "Marine Navigation Instruments", of which I have the
>1980 English edition, shows on page 119 a page from a Plath catalogue.
>This illustrates a quintant, a wider version of the sextant, used
>particularly by hydrographers, described as "Vermessungsquintant mit
>Trommelablesung". This undoubtedly has all the vital characteristics
>of a modern micrometer sextant.
>
>Below it on the page is a "Loth-sextant", which appears to show the
>standard Vernier (= nonius) instrument of the time. So it appears that
>the catalogue is at a transition-date, between the two technologies.
>
>The question at issue is the date of that catalogue. Randier describes
>it as "published about 1902", but that is irritatingly indefinite; to
>me, that catalogue doesn't look as though it had such an early date.
>
>So that leaves the date of the introduction of the Plath micrometer
>quintant still somewhat open. I wonder if the Jerchow book referred to
>above, which I think was published by Plath, offers any clues about
>that date?
>
>
>

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