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ICE-HOUSE, a repository for the preservation Post Date: Fri, 12 Sep 2008 21:26:39 +0000 ICE-HOUSE, a repository for the preservation of ice during the summer months. Autor of the post: Undefined For the construction Post Date: Fri, 12 Sep 2008 21:12:17 +0000 The aspect of an ice-house ought to be towards the south- east, on account of the advantage of the morning sun in expelling the damp air, which is far more prejudicial to it than warmth. The best soil on which such a house can be erected is a chalk-hill, or declivity, as it will conduct the waste water without the aid of any artificial drain ; but where such land cannot be procured, a loose stony earth, or gravelly soil on a descent, is preferable to any other. For the construction of an ice-house, a spot should bo selected at a convenient distance from the dwelling-house. Autor of the post: Undefined An air-trap should like- wise Post Date: Fri, 12 Sep 2008 20:52:44 +0000 A cavity is then to be dug in the form of an inverted cone, the bottom being concave, so as to form a reservoir for the reception of waste water. Should the soil render it necessary to construct a drain, it will be advisable to extend it to a con- siderable length, or, at least, so far as to open at the side of the hill or declivity, or into a well. An air-trap should like- wise be formed in the drain, by sinking the latter so much lower in that opening, as it is high, and by fixing a partition from the top, for the depth of an inch or two into the water of the drain, by which means the air will be completely excluded from the well. Autor of the post: Undefined The vacant space behind ought Post Date: Fri, 12 Sep 2008 20:38:59 +0000 A sufficient number of brick-piers must now be formed in the sides of the ice-house, fur tho support of a cart-wheel, which should be laid with its convex side upwards, for the purpose of receiving the ice ; and which ought to be covered with hurdles and straw, to afford a drain for the melted ice. Tho sides and dome of the cone should be about nine inches thick, the former being constructed of brick-work, without mortar, and with the bricks placed at' right angles to the face of the work. The vacant space behind ought to be filled with gravel, or loose stones, in order that the water oozing through the sides may the more easily be conducted into the well. Autor of the post: Undefined In a season when ice Post Date: Fri, 12 Sep 2008 20:19:04 +0000 The doors of the ice-house should likewise be made to shut closely ; and bundles of straw put before them, more effectually to exclude the air. The ice to be put ill should be collected during the frost, broken into small pieces, and rammed down hard in strata of not more than a foot, in order to make it one complete body ;* the care in putting it in, and well ramming it, tends much to its preservation. In a season when ice is not to be had in sufficient quantities, snow may be substituted. Autor of the post: Undefined ICOSAHEDRON, (from the Greek, eiKooasfipov,) Post Date: Fri, 12 Sep 2008 20:07:49 +0000 ICHNOGRAPHY, (from i%vo;, footstep, and ypaju, to describe,) an orthographical projection of an object on a hori- zontal plane, or the description of an object on a plane repre- senting the horizon, by straight lines from all points of the object perpendicular to the plane. This term is used only in reference to a projection of the same nature with another, on which it is made perpendicular to the former, by lines from all points of the object falling perpendicular to such plane, and consequently parallel, to that of the ichnography. ICOSAHEDRON, (from the Greek, eiKooasfipov,) in geo- metry, a regular solid, consisting of twenty triangular pyra- mids, whose vertices meet in the centre of a sphere, supposed to circumscribe it ; and therefore have their height and bases equal ; wherefore the solidity of one of those pyramids mul- tiplied by twenty, the number of base?, gives the solid con- tent of the icosahedron. Autor of the post: Undefined IMAGE, (from the Latin, imago,) Post Date: Fri, 12 Sep 2008 19:48:44 +0000 To form or make the icosahedron. Describe upon a card paper, or some other such like substance, twenty equilateral triangles; cut it out by the extreme edges, and cut all the other lines half through, then fold the sides up by these edges half cut through, and the solid will be formed. IMAGE, (from the Latin, imago,) the scenographic or per- spective representation of an object. Autor of the post: Undefined IMBOW, (from bow,) to arch Post Date: Fri, 12 Sep 2008 19:30:55 +0000 See PERSPECTIVE. IMAGERY, painted or carved work. IMBOW, (from bow,) to arch over, to vault. Autor of the post: Undefined Out of twelve parts between Post Date: Fri, 12 Sep 2008 19:17:51 +0000 IMBOWMENT, an arch, or vault. IMP AGES, (Latin,) in ancient joinery, is supposed to mean the rails of a door, as appears from Vitruvius, "The doors are so framed, that the cardinal scapi may be the twelfth part of the whole height of the aperture. Out of twelve parts between the two scapi, the tympans have three parts. Autor of the post: Undefined " IMPETUS (Latin) the span Post Date: Fri, 12 Sep 2008 18:59:54 +0000 The impages are so distributed, that the height being divided into five parts, two superior and three inferior are disposed. Upon the middle, the middle impages are placed ; of the rest some are framed at top, and some at bottom ; the breadth of the impage is a third part of the tvmpan; the cymatium is a sixth part of the impage; the breadth of the'scapi is the half of the impage; the replum is the half and a sixth part of the impage." IMPETUS (Latin) the span of a building, roof, or arch. 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