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Material
Date

Hoffman medium type thrust bearing

1925

Self aligning double row radial bearing

1910-1911

Arrangement of gear wheels

circa 1948

Heavy type ball thrust bearing by Hoffmann;1925.

1925
Parallel roller thrust anti-friction bearing

Parallel roller thrust anti-friction bearing

1937
Kinetic theory model kit (three dimensional) by Philip Harris Ltd., Catalogue No. P7975, consisting of perspex tube fitted with paper piston, metal cap at one end, and rubber diaphragm at the other end, plus card weights, spare diaphragms, reel of binding silk, packet of phosphor-bronze balls, and sticker for attaching to vibrator unit, boxed, as new (without vibrator unit)

Kinetic theory model kit (three dimensional) by Philip Harris Ltd.

1967-1980
"David Brown" standard worm reducing gear, sectioned, centre distance 4", ratio 3x29 to transmit 5HP continuously at 1440/150 R.P.M

"David Brown" standard worm reducing gear

1932
F.J. Worm gear (6/23 gear ratio working at 6" centre distance)

F.J. Worm Gear

1919-1920