This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
The accompanying sketch shows a side elevation of a very light sulky suitable for a cob 14 1/2 hands high. The oval iron stays A are made with a flap at the top end, to which the seat B is fixed; the front stays at the bottom are made of half-round iron, in the form of a bracket, being fixed to a light landing board C which extends upwards to take the footboard D. The hind stays at the bottom E may be fixed on top of the shafts, and have an ell flap to go on a bar framed across between the back end of the shafts. On the front edge of this bar a light iron stay should be fixed, sweeping round to get a fixing on the inside of the shaft, just behind the spring bearing. The seat B is 1ft. 5in. wide by lft. 10in. long, and has light iron rails fixed at the ends as F. The back-rests G should be made of steel, with a loop at the top to take a broad leather strap. The shafts H may be of hickory or lance-wood, 10ft. 9in. long over all, 2 in. wide by 1 1/4 in. thick, with a side cant of 4in. The springs I are of the elbow pattern, with a slight return sweep at the front end, hung by shackles to a light scroll made of spring steel. The wheels are 4ft. high, and may be of the pattern shown; or a light Warner wheel may be put on.
The step is lft. 5in. deep from the top of the crown to the top of the tread, and is fixed to the shafts and bar by two 5/16-in. bolts. The draught or whiffle-tree bar should be attached to the cross-bar, to which the steps are fixed, either by a centre-bolt or by two leather straps, and kept in position by two breeching staples. The rein rail is fixed on top of the shafts at such a height as to keep the reins clear of the horse.

A Trotting Sulky.
 
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