Alvan

Definition and stakes

Portrait of Ambrose Bierce Ambrose Bierce,  A Jug of Sirup

“ On the evening immediately after Alvan Creede’s adventure (which had somehow “got out”) a crowd of men, women and children thronged the sidewalk opposite the store. That the place was haunted by the spirit of the late Silas Deemer was now well known to every resident of Hillbrook, though many affected disbelief. Of these the hardiest, and in a general way the youngest, threw stones against the front of the building, the only part accessible, but carefully missed the unshuttered windows. Incredulity had not grown to malice. ”
Source: Wikisource

David Gill,  1911 Encyclopædia Britannica, Volume 18… (1911)

“ Instruments have been invented by Alvan Clark and Sir Howard Grubb for measuring with the spider-line micrometer angles which are larger than the field of view of the eyepiece. In both cases two eyepieces are employed, one to view each separate web. One drawback to this form of instrument is that the two webs cannot be viewed simultaneously, and therefore the observer must rely on the steadiness of rate of the clockwork and uniformity in the conditions of refraction whilst the eye is moved from one eyepiece to the other. ”
Source: Wikisource

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