Retrospect of Philosophical, Mechanical, Chemical, and Agricultural Discoveries, Volume 4J. Wyatt, 1809 - Agriculture |
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Common terms and phrases
acre advantage Agricultural Magazine alkali alkohol ammonia animal appears Arts azote barytes breed of sheep carbonic acid cent colour combustion common contained corn covered crop cultivation cylinder decomposed degree diameter earth effect equal experiments fallow fecula feet fiorin fixed flax fleece flock fluid former grain grass heat hemp hydrogen improvement inches increase invention iron land levers lime machine magnesia malt manufactured manure means Merino Merino-Ryeland metallic method mode motion mucilage muriatic muriatic acid naphtha necessary nitric acid Observations obtained oxalate oxalic acid oxide oxygen paper patent piece placed plants plates plough potash potatoes present produced proportion purpose quantity quicksilver rams recommended remarks rendered rollers rope Ryeland seed shew silex soda soil sowing sown Spanish specific gravity substance sufficient sulphur sulphuret supposed surface tion tube vegetable weight wheat wheel whole wool writer
Popular passages
Page 37 - And may not its resistance be so small as to be inconsiderable? For instance, if this ether (for so I will call it) should be supposed 700,000 times more elastic than our air, and above 700,000 times more rare, its resistance would be above 600,000,000 times less than that of water. And so small a resistance would scarce make any sensible alteration in the motions of the planets in ten thousand years.
Page 303 - Bell, in which he was much assisted by hi* snatch blocks. The second trial was repeated in a similar manner, and with equal success, the shell falling within a few yards of the former place; the gale of wind was brisk, and the water rough. The direction of the shell was nearly from north to south, and the wind blew nearly north-west. In the third trial, the mortar was elevated to 70 degrees...
Page 239 - ... of stimulating home production. Sir John Sinclair argued that the passing of a general Inclosing Bill was " the first and most essential means of promoting the general improvement of the country; and the importance of that measure has not as yet perhaps been so distinctly stated as it deserves. In general, those who make any observations on the improvement of Land, reckon alone on the advantages which the landlord reaps from an increased income ; whereas, in a national point of view, it is not...
Page 176 - It is perhaps too much to hope, that the geometrical arrangement of primary particles will ever be perfectly known ; since even admitting that a very small number of these atoms combining together would have a tendency to arrange themselves in the manner I have imagined ; yet, until it is ascertained how small a proportion the primary particles themselves bear to the interval between them, it may be supposed that surrounding combinations, although themselves analogous, might disturb that arrangement,...
Page 480 - Having performed this part of the operation, they immediately under the ball divide the bark down to the wood, for nearly two-thirds of the circumference of the branch. A cocoa-nut shell or small pot is then hung over the ball, with a hole in its bottom, so small that water put therein will only fall in drops ; by this the rope is constantly kept moist, a circumstance necessary to the: easy admission of the young roots, and to the supply of nourishment to the branch from this new channel.
Page 480 - ... until a ball is, formed, five or six times the diameter of the branch. This is intended as a bed into which the young roots may shoot. Having performed this part of the operation, they immediately, under the ball, divide the bark down to the wood for nearly two-thirds of the circumference of the branch.
Page 178 - By this arrangement some brilliant phenomena were produced. The potash appeared a conductor in a high degree, and as long as the communication was preserved, a most intense light was exhibited at the negative wire, and a column of flame, which seemed to be owing to the development of combustible matter, arose from the point of contact.
Page 85 - Begin at the head of the sheep, and proceeding, from between the ears, along the back to the end of the tail. The wool is to be divided...
Page 30 - Those who have attended to the habits of the hearth cricket (Gryllus domesticus), know that it passes the hottest part of the summer in sunny situations, concealed in the crevices of walls, and heaps of rubbish. It quits its summer abode about the end of August, and fixes its residence by the fire-side of the kitchen or cottage, where it multiplies its species, and is as merry at Christmas as other insects are in the dog-days.
Page 197 - ... the velocity must be the proper measure of the force of a body in motion, because the sum of the products of the various masses of any system of bodies into their respective velocities, is always the same in the same direction, unless acted upon by some external force. In other words, because the motion of the centre of gravity of any system of bodies cannot be changed or disturbed by any action of those bodies upon each other. If two equal non-elastic balls A and B, whose common centre of gravity...