This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
Fig. 1 is a side eleval Lon and Fig. 2 a back elevation drawn to a scale of 3/8 in. to 1 ft. of a tub or trap suitable for a 13-hands pony. The length on the seat is 3ft. 3 in.: length of top rail, 3 ft. 9 in.; depth of well, 11 in.; depth above seat, 9 in.; length of bottom, 2 ft. 6 in.; width, 2ft. 2| in. Greater sail is given to the sides so that the top of the vehicle is quite square. Walnut should be used for the well if to be finished in plain varnish. If the frame bottom be of ash, a pair of fence routers for rabbeting on sides and bottom will be required. Or the trap can be put together by rabbeting the ends and using 1-in. deal boards for the bottom, which can be nailed to battens running along the bottom of the sides. The seat boards are of birch 12 in. wide, screwed on top of the well; or the seats may be all framed together similar to the- bottom. The four corner pillars and top rails are 1 1/4 in. by 1 1/2 in. The sticks are of ash, 1/2 in. square, finished black, the stained mahogany panels being screwed on inside. The wheels are 3 ft. 6 in.: stocks, 6 1/4 in. diameter by 7 in. long. Front hoop, 4 in. inside diameter by 2 in. wide: hind hoop, 5 in. diameter by 1 in. wide; spokes, l 1/2 in.; felloes (cut from 2-in. ash plank) to finish about 1 3/4 in. square on thickest part; tyres, 1£ in wide.
The wings are 3 ft. 1 in. by 6i in. by 1/5 in., and the raised backs 3 ft. 1 in. by 4 in. by 1 in. The wing irons should be fastened on underneath'raised backs, and have 7 in. clearance of the wheels. The elliptic springs are 3 ft. 1 in. between centres of eyes and have live plates H in. wide. The shafts are fastened under the seats, and are 5 ft. 5 in. long in front of splinter bar, and 21 in. to 22 in. wide where the tug stops come about 15 in. from points. Breeching staples are 2 ft. from splinter bar, which is 1 5/8 in. wide by 1 3/4 in. deep, and let on tops of shafts f in., clearing the front of the trap by an inch or so. The dash is 21 in. long and 12 in. high; axle, 1 1/4 in. at least with a 5-in. crank, and 3ft. 7 in. between shoulders, clearing bottom of tub 9 in. The step is l0 1/2in. long, 6 in. wide, and 5 in. broad. The door handle is of:3 1/2-in. plain brass. The door is 17 in. wide at the top and 1.3 in. at the bottom.

Trap for 13-Hands Pony.
 
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