Transactions of the Society Instituted at London for the Encouragement of Arts, Manufactures, and Commerce, Volúmenes 43-44 |
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Página vi
... late uncle of copying Screws by means of the Lathe . Mr. DAVID MATHEWS on an improved method of bar- 90 rowing out soil · Mr. J. P. HUBBARD on a folding chair • 385 94 99 WILLIAM BROCKEDON , Esq . on a Mechanical Apparatus • vi CONTENTS .
... late uncle of copying Screws by means of the Lathe . Mr. DAVID MATHEWS on an improved method of bar- 90 rowing out soil · Mr. J. P. HUBBARD on a folding chair • 385 94 99 WILLIAM BROCKEDON , Esq . on a Mechanical Apparatus • vi CONTENTS .
Página x
... soil . A tract of absolutely unproductive peat moss , sixteen hundred acres in extent , was se- lected by Mr. Creyke as the object of his magnificent operations : it was divided into three large compart- ments of nearly equal area ; a ...
... soil . A tract of absolutely unproductive peat moss , sixteen hundred acres in extent , was se- lected by Mr. Creyke as the object of his magnificent operations : it was divided into three large compart- ments of nearly equal area ; a ...
Página xi
... the other , by registering in their volumes the date and particulars of such plantations , to afford hereafter valuable information respecting the comparative growth of timber on various soils and under different PREFACE . xi.
... the other , by registering in their volumes the date and particulars of such plantations , to afford hereafter valuable information respecting the comparative growth of timber on various soils and under different PREFACE . xi.
Página xii
Royal Society of Arts (Great Britain). comparative growth of timber on various soils and under different circumstances . For the last four years the Society have endeavoured to improve the straw - plat manufacture of the country , with a ...
Royal Society of Arts (Great Britain). comparative growth of timber on various soils and under different circumstances . For the last four years the Society have endeavoured to improve the straw - plat manufacture of the country , with a ...
Página xix
... soil , as practised by him in clearing the harbour of Bridlington , in Yorkshire . It requires rather less horse power than is usually wanted , as the man is not drawn up together with the barrow , and the serious accidents that not ...
... soil , as practised by him in clearing the harbour of Bridlington , in Yorkshire . It requires rather less horse power than is usually wanted , as the man is not drawn up together with the barrow , and the serious accidents that not ...
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acres Aikin anchor apparatus basket bason best copy best drawing best original paint boat bridge brush-wood catch 22 chalk cloves cocoons colony colour cultivation Ditto effectual eggs employed engraving equal experiments feet Fifty Guineas fixed full account George Gold Ceres Medal Gold Isis Medal Gold Medal Gold Vulcan Medal grass greatest quan greatest quantity ground hemp Henry improved inches Indian ink invent and discover iron James John landscape large Silver Medal last Tuesday leaves less manufactured merit mode mulberry tree person plantations plants portrait pounds pounds weight premium prevent rack raised rope screw Secretary seed side silk silk-worms Silver Ceres Medal Silver Isis Medal Silver Palette Sneaton Society a method Society the best Society's soil specimens spring Strand stud superior Thirty Guineas Thomas timber Tuesday in February Tuesday in March upper weight wheel white mulberry William wood worms Zealand flax
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Página 160 - The above figure is a representation of the engine; A is the pipe by which the supply of water is brought from a head, 170 feet above the engine ; B is a vessel containing air, the continual elastic pressure of which prevents the blow that would otherwise be occasioned by the descent of the water; c is a throttle valve...
Página 42 - In some instances it is well to run small wood pegs through the portions of glue, so as to keep them exactly in their proper positions. If the mould be of considerable size, it is better to let it be bound with moderate tightness upon a board to prevent it bending whilst in use ; having done as above described, the plaster of Paris, as in common casting, is to be poured into the mould and left to set. In many instances wax may...
Página 42 - The description thus given is with reference lo moulding those bodies which cannot be so done by any other than an elastic mould ; but glue moulds will be found greatly to facilitate casting in many departments, as a mould may be frequently taken by this method in two or three pieces, which would on any other principle require many.
Página xxxvi - To the person who shall invent and produce to the Society a method, superior to any hitherto known or in use...
Página 302 - An Appeal to the British Nation, on the Humanity and Policy of forming a National Institution for the Preservation of Lives and Property from Shipwreck.
Página 34 - The pot is then turned and fixed in a proper position in the furnace, without being allowed to cool, and is then charged with cold iron, so that the metal, when melted, shall have its surface a little below the mouth of the pot. The iron is melted in about an hour and a half, and no flux or addition of any kind is made use of. A pot will last for fourteen or even eighteen successive meltings, provided it is not allowed to cool in the intervals ; but if it cools, it probably cracks.
Página 113 - II.) where bb is the copper dish, surrounded by a ring of the same, by which the plate is firmly screwed down upon the rim of the main hole. In the middle of...
Página 161 - The rod of the piston w is attached at its top to one end of the beam ; at the other end of the beam is a rod, terminating below in the crank m: the oscillating motion of this crank is transferred, by means of the connecting bar /, to the axis k, on which is placed the curved tooth or cam n...
Página 107 - In making the sword-blades there are several methods used ; some make a pile of alternate layers of soft and hardened steel, with powdered cast-iron, mixed with borax, sprinkled between each layer. These are drawn out to one-third more than the length of the intended blade, doubled up, heated, twisted, and reforged several times ; the twist is brought up in the same way as that in the gunbarrels.
Página xiv - To the person who shall discover to the Society the cheapest and most effectual method of raising water in quantities sufficient to be beneficially employed for the purpose of irrigating land, superior to and cheaper than any other method now in use ; — the Gold Medal, or Fifty Guineas. A model, on a scale of one inch to a foot, with...