. The Intellectual observer. ly costs a small fraction of the price charged for the ordinary cross tripodstands, which it excels in every way. The vertical movement is given by ascrew, which works more pleasantly than the ordinary rack, and the horizontalmovement is obtained by making the base of the stand rest on three rollers, soplaced that a slight pressure with the finger communicates a circular motion ineither direction. An important novelty in the vertical movement is an ingeni-ous method by which it can be instantaneously altered from a quick to a slow-motion, or vice versa, as occasion
. The Intellectual observer. ly costs a small fraction of the price charged for the ordinary cross tripodstands, which it excels in every way. The vertical movement is given by ascrew, which works more pleasantly than the ordinary rack, and the horizontalmovement is obtained by making the base of the stand rest on three rollers, soplaced that a slight pressure with the finger communicates a circular motion ineither direction. An important novelty in the vertical movement is an ingeni-ous method by which it can be instantaneously altered from a quick to a slow-motion, or vice versa, as occasion requires. As a table stand for seaside use, andfor astronomical purposes, this invention is superior to anything previously pro-duced, while it has the further recommendation of great portability. A ten-inchtelescope with the Berthon stand can be packed in a case not so long, and littlebroader than a stout umbrella. Messrs. Home and Thornthwaite have thecredit of bringing this excellent invention before the public. PLATE MAY j EEN AN] (£, ulgaia.) TIE INTELLECTUAL OBSERVER. OCTOBER, 1864. EPHEMERA, THE BY THE EET. W. HOUGHTON, , {With Two Plates.) Let us fancy ourselves on the banks of a trout-stream aboutthe end of May or the beginning of June, for it is too late inthe year, now that October leaves are beginning to fall, to lookfor any species of the May-fly family, unless, perhaps, one maydiscover some small members of the group, such as the littleBlue and Pale Dans, Baetis and Cloe, which love to dance inthe sunny days of a calm autumn. What a lovely morning for a days fly-fishing! Ill bebound the greea-drake will be on the water in the course ofthe day, so let us start at once, with rod and basket in hand,and let us not forget a few collecting bottles, and a net—uotfor the fish, but for the May-flies; for angler-naturalists, youmay be sure, never set out on a fishing expedition withoutcollecting bottles and gauze nets. Our art can tell the insect
Size: 1235px × 2024px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, bookpublishe, booksubjectscience
