"Drummond-Barreto"  Universal Machine circa 1912
The Drummond-Barreto" was an early attempt to make a combined lathe and miller capable of not only of turning between centres but also large-diameter boring, screwcutting, milling and gear cutting. The centre height was adjustable from 7" to 18" by raising and lowering the headstock and tailstock on screw-operated slides - a system used again in the 1950s on the much smaller Murad bench lathe/miller. The speed range was set at a nominal 5 to 270 rpm, the higher speed representing a rather low figure even for the early part of the 20th century, when cutting speeds were limited by the comparatively narrow range of available tool steels.
The apron was fitted with what must have been a very cleverly-designed mechanism, capable of reversing both the screwcutting leadscrew and the power-shaft drive "without shock at any speed" - but you would be safe to hazard a guess that this particular claim would not pass muster with today's Advertising Standards Authority …..
Besides the usual small accessories of centres, spanners and catchplate, a 20" diameter faceplate and a large angle plate were supplied with the machine as standard.
The 3-step input drive pulley was mounted low down on the headstock end of the bed and was designed to be driven, like most machine tools of the time, from overhead line-shafting that threaded its way through the roof space of every engineering works and textile mill in the world. A single, fixed belt then passed up to the headstock where it drove an open 3-speed gearbox - the operating levers of which can be seen splayed out and angled downwards from their attachment on the milling-arbor support casting on top of the headstock. The lathe was also available with a "silent-chain" driven, a self-contained electric motor drive and 3-speed enclosed gearbox - similar in design to that used by South Bend in the USA and also used as an option on that company's "large-swing" (fixed centre height) lathes..

Drummond 6" - raising to 9" BGSC  lathe circa 1912
This lathe was designed to be converted into a larger swing machine by the use of raising blocks beneath the headstock, top slide and tailstock. The engineering niceties of the interesting treadle design were probably lost on the poor apprentice who provided the motive power whilst his master was busily engaged with tasks requiring greater skill …
The whole of the saddle top was formed into a T-slotted table and could mount either a (rather unusual) swivelling compound slide rest - as shown - or a variety of fastenings (see below) designed to allow large objects to be machined with boring bars or face cutters. 

Drummond 6" lathe showing the large T-slotted saddle being used as a boring table to machine  a 4" diameter barrel from an engine used in a small steam launch.

Drummond 5" "double-height bed" lathe circa 1912.
Careful examination of the above illustration (of an early 5-inch) will show that, whilst the saddle ran on one pair of low-set bed ways, the tailstock has it own ways at a much higher level. This design, introduced on a 4-inch version some years earlier, aimed to provide a very large gap, capable of allowing the saddle to travel, fully supported, right up to the faceplate; there was no gap piece to remove and so no weakening of the bed when turning the largest diameters. The cross slide was a substantial casting, fully T slotted for use as a  boring or milling table, with the slots running in the same direction as the bed; its design, claimed Drummond, allowed items such as twin-cylinder engines to be bored at one setting and so made the lathe especially suitable for motor-car repairs. Two leadscrews were fitted, one provided power sliding along the bed, the other power surfacing across it. The sliding feed was selected by a domed-headed, spring-loaded lever moving in a vertical slot at the tailstock-end of the apron with neutral in the centre the upper and lower positions could be selected to move the carriage to right or left. Power surfacing (across the bed) was engaged by pulling out a knob underneath and just to the left of the cross-feed handwheel; the direction of this feed could be changed by using the normal tumble-reverse mechanism on the headstock. The arrangement of this mechanism must have given trouble for, like that on the 3.5-inch model, changes were made and the position of the control levers altered.
The method of fixing the top slide to the 8 Tee-slot cross slide was, in effect, a beefed up version of that used on the 3.5 inch B Type lathe where the base of the top slide was made in two parts and the lower element aligned with a long rectangular key and formed a base on which the upper part could swivel.
Whilst early versions of the lathe were arranged for drive by a separate countershaf - or from overhead line shafting, -later models were to become the company's first effort at an integrated drive system. A motor, mounted on a heavy, adjustable bracket outboard of the headstock-end plinth, drove upwards to a shaft held between bearings carried in each wall of the plinth. The shaft carried a gear (made from compressed strips of leather) that engaged with teeth cut in the rim of the flywheel.
Click here for other 5-inch pictures. Other larger Drummond lathes can be found here.

Later 5-inch Drummond showing the company's first effort at an integrated drive system. A motor, mounted on a heavy bracket outboard of the headstock-end plinth, drove upwards to a shaft held between bearings carried in each wall of the plinth. The shaft carried a gear (made from compressed strips of leather) that engaged with teeth cut in the rim of the flywheel.