excellent Pamphlet, coinciding almost wholly with our views on this subject. On the Steam Jet, we think we have said enough to show its importance-besides, this subject has been already sufficiently discussed before Committees of both Houses of Parliament. Nevertheless, we cannot refrain from expressing our surprise that the Admiralty, when the country is on the eve of a war, should not have paid due attention to the plan communicated to them by Dr. Vacy, in February, 1846, for employing horizontal funnels in war steamers, instead of the vertical ones in present use. He proposed to produce a draught through the furnaces by means of the Steam Jet. This plan, if carried into operation, would undoubtedly prevent any diminution of power in the engines in case the funnel should be carried away by shot, or by any other accident. The eminent scientific men to whom we are indebted are Woolhouse, Rawson, Sewell, Amos, Tate, and Holland, one of the Admiralty engineers. The principal publications we have consulted are the Mechanics' Magazine, and the Civil Engineer and Architect's Journal, works containing the latest information concerning the discoveries and inventions that have taken place in every domain of Art or Science. We may also mention the Philosophical Transactions of the Royal Society of London, and some of the works of that able writer Tredgold. Many excellent articles on subjects connected with the principles of heat and steam have appeared in the Mechanics' Magazine, under the signature A. H. Who this A. H. can be we are unable to say, but we must state, that as he has not hidden his talents under a bushel, we see no good reason why he should hide his name under it. In the Civil Engineer and Architect's Journal, we have a similar case; many articles of surpassing merit have emanated from a gentleman that signs himself H. C. This is equally unintelligible to the masses, to us it is not quite so mysterious; we are inclined to believe that H. C. is no other person than Homersham Cox, a gentleman well known as one of the ablest contributors to Practical Science in this country. In conclusion, we may state, that at the end of the work we give Tables of various kinds, which will be found useful to our readers. THE AUTHORS. December 16th, 1853. To find the Pressure at which the Steam is admitted To find where the Velocity of the Piston is greatest Examples on the four preceding Rules Experimental Table, showing the Volume which a cubic Foot of Water has in the form of Steam at the different Pressures, as well as the corresponding Temperatures . Rules for finding the Length of the Slide and Eccentric Levers, ON THE SLIDE VALVE, TAKING INTO ACCOUNT THE LAP AND LEAD 49 Geometrical Construction (Mr. Amos' Method) RULES AND EXAMPLES FOR THE LAP AND LEAD OF THE SLIDE Table of Multipliers, to find the Lap and Lead when the Steam is to be cut off at to 7ths of the Stroke Tables showing the working of the Slide Valves of several To find the Pressure at which the Steam is admitted Examples fully worked out by means of these Formulæ, to show ON THE WORK DONE ON THE PISTON PER MINUTE |