Three antique ivory scale rules £45.00
Hemmi Bamboo Slide Rule, ( with A : B : C : D : C1 : K : S : T : L scales) in mint condition. (made circa 1930s) £25.00
Aristo 6" Reitz Pattern Pocket Slide Rule, model no89, in mint condition. (made circa 1970) £10.00
French Pocket Pedometer with 0 to 10 mile scale also small secondary scale giving readings to 1/100th of a mile (Made circa 1930's) £45.00
French Pocket Pedometer reading 0 to 20 miles with pace adjustment. ( Made circa 1950's) £30.00
Antique Harling Ivory Sector £85.00
Pentagonal Prism 30mm x 30mm. Used but in pefect condition £15.00
Pentagonal Prism 25mm x 25mm. Used but in pefect condition £15.00
Lacquered Brass Microscope Objective Boxes, mostly by C.Baker circa 1930s £5.00 each
Antique ramsden eyepiece, focuses at about 12mm, diameter approx 25mm. £10.00
Small low power short focus instrument telescope, focuses at about 40mm, the tube is 75mm long & 90mm extended, the object glass lens is 21mm diam, the telescope focuses at about 40mm with a magnification of about x2 it will also focus at infinity. £10.00
90 degree Dense Flint Glass Prism £10.00
60 degree Prism in high quality dense flint optical glass. £15.00
Rock Specimens £10.00 each
Aristo Studio Duplex Slide Rule, model ref 0968, in mint condition. (made circa 1970) £45.00
Beck Replica Grating 600 lines per inch. £57.50
