from The Century Dictionary and Cyclopedia
- n. One of two pieces of metal with parallel sides fitted on the ends of the cross-head of a steam-engine, on which the cross-head slides and by which it is kept parallel to the cylinder. They are a substitute for the parallel motion. Also called guide-block, slide-rod, and slide.
Sorry, no etymologies found.
She went sailing down into the main lounge, caught a guide-bar and spun herself around.
The mechanism controlling the water feed embodies the curved bar (25), connecting-rod (27) and flat guide-bar (29) as used for controlling the carbide feed in the "A" type of generator (Fig. 46).
A3 folded in half is A4 size - so you can set up a page, layout, photoset, notice, so on, on A4 sheet - move the guide-bar across in the printer feed, put A3 sheets in the feed - click A3 in the Printer dialog - and the A4 setup prints as A3.