1 work
1.1 instruments drawing
1.2 steam-engine indicator , indicator-diagram
1.3 treatise on steam engine, 1827
work
instruments drawing
tree instruments making perspective drawings, 1814. farey s invention pictured in middle in fig. 4 , 5.
the necessity of accomplishing drawings accuracy in limited time led farey invent in 1807 instrument making perspective drawings, received silver medal society of arts in 1814. in accompanying letter printed in transactions, farey explained in general:
with receive instrument of invention drawing lines converging distant point. have found extremely useful in making perspective drawings, gives artist means of making drawing upon a. board or table of moderate dimensions though vanishing points fall @ ever great distance; instrument quite general in proper ties, being capable of drawing parallel lines, may therefore considered converging point @ infinite distance, or may in moment altered draw point within few inches distance. shall obliged communicate society.
the first instrument of kind, made in year 1807, , have had in constant use ever since, applies advantage every perspective drawing; l have been induced present society, @ request of several members...
an additional 4 page long explanation of farey s instrument drawing lines inaccessible center in plate 2 (see image fig. 4, 5.) started explaining:
this instrument acts upon drawing board, or table, on paper fastened, facility , little attention t square does, when drawing parallel lines, , found extremely useful draw buildings, etc. in perspective, points lines such drawings should converge, fall @ distance of i2 , 15 feet picture, render impracticable employ rulers of sufficient length reach points, , there is, except instrument , mr. nicholson’s lately invented, no other practicable method of drawing such lines.
the instrument consists of 3 rulers, b , d, figs 4, united common centre-screw a, , have thumb screw d, fixes them fast @ angle @ may placed...etc, etc.
farey s elliptograph, 1825
in 1813 farey constructed machine drawing ellipses, so-called ellipsograph. device became popular, 6th edition of encyclopædia britannica (1824) included article it, started with:
elliptograph in encyclopædia britannica, 1824
elliptograph, instrument drawing ellipses. trammel instrument has long been known , used describing ellipses. on principle of trammel, mr farey constructed elliptograph in form more commodious drawing. mr farey s elliptograph represented @ fig. 5. plate lxxix. circle slides between 2 parallel rulers d e. circle 13 slides between 2 parallel rulers fg, @ right angles former. in way, if line, joining centres of circles, made revolve, m, extremity of line, describe ellipse in same manner, extremity e of line c d e, fig. 1, in trammel. elliptograph may considered trammel, in pins c , d, rig. 1, enlarged circles , b, fig. 5...etc, etc.
the drawing device described in many other publications in days, example in smith s mechanic; or, compendium of practical inventions, 1825 (see image), , described in edinburgh encyclopædia (1832) along 4 other devices farey. invention gold medal of same society awarded hun.
steam-engine indicator , indicator-diagram
at construction of ironworks in russia since 1819 first saw steam-engine indicator; on return england employed mcnaught make indicators general use, , thenceforth continually requested use instrument in disputed cases of power of steam-engines.
a treatise on steam engine, 1827
a treatise on steam engine, 1827, plate 22
farey wrote two-volume work treatise on steam engine, has been described finest work on technology published in industrial revolution.
the first volume covered developments of steam pumps, atmospheric engines , low pressure steam engines through eighteenth century. in particular, work of savery, newcomen, smeaton , watt. published in 1827. rekers & koetsier (2007) commented on work:
of farey’s work, first of 2 volumes published @ time, dealt history of steam engines death of james watt. farey described sorts of engines, gave special attention designed smeaton. besides this, volume included sections on principles of mechanics , design of engines, avoiding mathematical formulas engineers @ time not have been able understand them, according farey...
[1] second volume covered development of high-pressure steam , simple expansion steam engine 1800, trevithick , woolf. volume never published; @ time of farey s death had been typeset, not sold.
the book never sold sheets pulped. reprinted in facsimile since author s proof, hand-written corrections author, in national reference library of science , invention.
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