The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

[1419]. Solid head and collar bolt, bed bolt.

[1420] & [1421]. Heads for bolts to slide and turn in T grooves of planing machines, &c.

[1422]. Countersunk bed bolt. Boiler stay.

[1423], [1424], & [1425]. Methods of finishing screw heads to prevent catching passing articles.

[1426]. Screw head, with cross dovetails to carry a key or screwing lever.

[1427] & [1428]. Right and left-hand screw couplings for tie rods, &c.

[1429]. Ring coupling for 2, 3, 4 or more rod ends for tie bracing.

[1430]. Right and left-hand screw couplings with halved ends to prevent the rods turning; may be made with one fine and one coarse thread for differential motion, or with right and left-hand threads.

[1431]. Rifling, as used in ordnance, &c., i.e. an internal multiple screw thread of very long pitch.

[1432]. Screw spanner; the weight prevents it working loose.