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Musf/frs.sc 
 
 ImproTei Snow Plaugta for Bailways. 
 
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 Having obtained Letters Patent, No. 374, for an ''Improved 
 Snozv Plough for Railways: I take the liberty of enclosing you 
 the annexed description of the Invention, in the full confidence 
 that it cannot fail to prove of practical value and utility to 
 Raihvay Companies whose lines are subfct to blockade by mow 
 drifts. 
 
 The Patent of this Invention I am now prepared to dis- 
 pose oj, and will be happy to entertain any proposition to that 
 end with which you may honor me, on the part of the Rail- 
 xuay Company you represent. 
 
 I have the honor to be, Sir, 
 
 Your very obedient servant. 
 
 Dcuison Avciiiic, 
 
 1 oronto, Out.. October, /S/o. 
 
 JOHN CARR. 
 
IDESOI^XIPTIOISr 
 
 OK 
 
 " Carr's tagrofed Saow PlongJi, for Railways." 
 
 SECURED BY LETTERS PATENT, DATED APRIL 25, 1870, 
 
 -►♦»♦-♦- 
 
 " The invention consists of a double-leafed plow, conatnicted so as to dump its load to each side ; the fninie 
 work of said plow b(.ing pivoted, transversely of its truck, in such a manner that .c may be made to assume a hori- 
 zontal posture after having, in its inclined position, been forced into a field or drift of snow, and thus take up a 
 load and support it while the engine is running baek, the leaves of the plow being connected by a two-branched 
 cord or chain, passing over a pulley placed in the top ..f a pillar above the tioor of the plow-truck, with a windlass 
 beneath such Ihior, niid windlass being fixed upon a shaft, bearing, near one end, a cog-wheel, and sustained at 
 that end ni a slidinjr box, in such a manner that the cog-wheel may bs slid into a gear with a t.jothed pinion on 
 the front axle of the locomotive, and therefrom drive the motion retpiisite to lift, by means of said chain or cord 
 the leaves of the plow, and thus cause them to dump their load ; the toothed pinion on the locomotive axle bein" 
 made in two pieces, connected by bolts, and fixed upon another. ° 
 
 The plow-frame is a simple rectangle, oblong in shape, and pivoted upon the truck. 
 
 In running forward to clean the track of snow, the frame is inclined, so that the point is '^werv.l within two 
 inches of the rail. 
 
 A toggle lever is pivoted at its upper extremity, to each upper corner of the frame, and at its lower extremity 
 to the truck vertically beneath. 
 
 Bars connect the central joints of the toggle levers with wrist-pins in the side of a toothed wheel, in such a 
 manner that by rotating the crank-wheel in the proper direction, which crank-wheel is suitably connected by shafts 
 and gearing with the wheel, the toggle-levers may be straightened out or drawn together, tlius lowering the upper 
 end of the plow-frame, and drawing the latter from an inclined posture to a horizontal one, or the reverse. The 
 former operation is performed when it is desired to take up a load of snow upou the shovel, preparatory to running 
 the engnie back, for the purpose of delivering such load in a clear space. 
 
 The plow-frame sustains the leaves of the sheet metal, suitably braced and stayed, and hinged at their outer 
 sides to the outer edges of the frame, the leaves being of a suttijient width to wholly cover the'frauie. 
 
 On arriving at the clear space spoken of, the leaves are lifted from the centre, in order to dumj) the l,)ad. 
 Sucli lifting is (.ffected la two-branched cord, fastened at its lower end to handles projecting downward, one from 
 the inner and upper corner of each leaf. 
 
 The cord or chain passes over a sheave in the top of a pillar, fixed in the truck floor. The cord runs thence 
 through the truck fioor, and is fastened at its other extremity, to a windlass, on a shaft, placed transversely of the 
 plow-truck, and sustain-jd, at its end, in boxes attixed to the under surfaces of the side beams of the truck. 
 
 One of the boxes has slots in it, by means of which it is made to slido ..n its fastening screws. 
 
 There is a shaft which sustains a cog-wheel, which, owing to the adjustability of the shaft, may be thrown 
 into or out of gear with a toothed pinion on the locomotive axle. A hand-lever is the instrument by which the 
 shaft is moved. 
 
 When the ongiiu^ i unning back, and the wheels are thrown into gear, the cord is wound around a windlass 
 and brings a strain upon the handles, which at once lifts the leaves of the plow, and causes them to dump their 
 load. 
 
 The load discharges and the leaves thrown out of gear, the loaves fall into position again, of their own weight. 
 
 The toothed pinion is made in two parts, each part having a flange upon it, through which to pass the con- 
 necting bolts. Thus the pinion may be readily taken otf from one axle, and fixed upon another, at pleasure. It 
 is from this piv.ion the power is derived by which the plow is depressed at the point and elevated as desired, and 
 the hiad of snow dumped when the open space is reached, as before indicated. 
 
 The point of the plow is again lowered, the locomotive driven forward to the snow-drift, another load taken 
 on the i^low, the point elevated to a level, the engine backed to a suitable point for dumping the snow, the leaves 
 uf the plo« elexafed from tile centre and the load dum]ied— and this operation is repeated until the snow-drift is 
 all removed and the track cleared and ready for use by the trains.