The London Journal of Arts and Sciences, Svazek 4

Přední strana obálky
Sherwood, Neely, and Jones, 1822
Containing reports of all new patents, with a description of their respective principles and properties: also, original communications on subjects connected with science and philosophy; particularly such as embrace the most recent inventions and dicoveries in practical mechanics.

Co říkají ostatní - Napsat recenzi

Na obvyklých místech jsme nenalezli žádné recenze.

Další vydání - Zobrazit všechny

Běžně se vyskytující výrazy a sousloví

Oblíbené pasáže

Strana 34 - LOUDON'S ENCYCLOPEDIA of AGRICULTURE: comprising the Laying-out, Improvement, and Management of Landed Property, and the Cultivation and Economy of the Productions of Agriculture. With 1,100 Woodcuts. 8vo. 21s. London's Encyclopaedia of Gardening : comprising the Theory and Practice of Horticulture, Floriculture, Arboriculture, and Landscape Gardening.
Strana 168 - Middlesex, for certain improvements in the construction of lamps, whereby they are rendered capable of burning concrete oils, animal fat, and other similar inflammable substances.
Strana 145 - It may be added, that when the machinery of the mill has attained its proper speed, certain balls rise by their centrifugal force, so as to draw a box below the reach of a bell handle, which will then cease to ring a bell, placed in some convenient situation for the purpose. But, should the men at the wheels cease to keep up the requisite speed in the mill-work, the balls will descend, and a projecting pin on the box striking the handle, placed in the proper situation for that purpose, will continue...
Strana 261 - ... pounds, two hundred and thirty-two feet, in a minute ; and of working, on an average, eight hours per day. This is equivalent to the work of thirty-four men; twenty-five square feet of canvas performing the average work of a day-labourer.
Strana 146 - Roofs or Beams; and Gladstone's, for a Method of increasing the Strength of Timbers; to these it may be useful to add the two following Inventions. Mr. Smart, of Westminster Bridge Road, having been long convinced of the great convenience of flat roofs in London, and other great towns, where space is valuable, considered that their principal objection arose from the necessity of very strong bearings, which were necessarily weighty and expensive. To obviate this he devised the Bow and String Rafter,...
Strana 155 - Is magnetism identical with electricity, or an independent agent put in motion or activity by electricity? Queries of this kind might be considerably multiplied, and stated in more precise and various forms : the solution of them, it must be allowed, is of the highest importance; and though some persons have undertaken to answer them in the most positive manner...
Strana 255 - ... this way than when salted. The sugar gives no disagreeable taste. This process is particularly valuable in making what is called Kippered Salmon; and the fish preserved in this manner are far superior in quality and flavour to those which are salted or rit smoked.
Strana 38 - ... the obstacles that present themselves to the passage of the oxygen in the former case, on account of the greater depth and smaller surface of the root. It was further observed, that roots which penetrate into dung, or. into pipes conducting water, divide into immense numbers of fibres, and form what is called, the fox-tail root ; but it is, because they cannot continue to vegetate, except by increasing their points of contact, with the small quantity of oxygen found in such mediums. Lastly, it...
Strana 96 - In every instance that an oil, whether volatile or fixed, was heated with corrosive sublimate, mutual decomposition took place, charcoal was evolved, and muriatic acid and calomel formed. Besides, when oil of turpentine was used, some traces of artificial camphor appeared...
Strana 175 - ... or the ship would not be in danger of being pooped, although no dead-lights were employed; at the same time it would be a sufficient protection to cabin windows, for it is only when water is kept in a compact body that it is...

Bibliografické údaje