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Demonstration model of a differential gear

Demonstration model of a differential gear

1890-1905
Model of breast water wheel with pentrough sluice

Model of breast water wheel with pentrough sluice

1868
Wooden model of wall bracket

Wooden model of wall bracket

1868
Model of crank shaft bearing with two adjusments

Model of crank shaft bearing with two adjusments

1888
Bottle for Gas-Oedem serum

Bottle for Gas-Oedem serum

1900-1910
Two double helical gear wheels in mesh on iron stand

Two double helical gear wheels in mesh on iron stand

1888
Schwartzkopf's universal spanner

Schwartzkopf's universal spanner

1862-1888
Complete set of cardboard models of second order surfaces in original packing by L. Brill of Darnstadt

Complete set of cardboard models of second order surfaces in original packing by L. Brill of Darnstadt

circa 1900
Single threaded worm and worm wheel

Single threaded worm and worm wheel

1868
Model of Houldsworth's differential motion

Model of Houldsworth's differential motion

1883
Model of two conoidal pulleys with open belt

Model of two conoidal pulleys with open belt

1888
Wooden model of footstep bearing for a water turbine

Wooden model of footstep bearing for a water turbine

1890
Bevel wheel and pinion in gear

Bevel wheel and pinion in gear

1868
Model of nipping lever for a saw frame

Model of nipping lever for a saw frame

1890
Model of reversing motion by clutch and bevel wheels

Model of reversing motion by clutch and bevel wheels

1868
Model showing development of skew bevel wheels

Model showing development of skew bevel wheels

1888
Model of Portion of Involute Mortise Spur Wheel

Model of Portion of Involute Mortise Spur Wheel

1868
Cog for Model of Spur Wheel

Cog for Model of Spur Wheel

1868
Model of Mangle Wheel and Pinion (made by Schröder)

Model of Mangle Wheel and Pinion (made by Schröder)

1883
Two heart wheels in gear transmitting a variable velocity ratio, teaching model / J. Schröder, 1868

Two heart wheels in gear transmitting a variable velocity ratio

1868
Model showing by wire hyperboloidal pitch surfaces of skew level wheels.

Diagrammatical model of hyperboloidal pitch surfaces

circa 1889
Wooden model, scale 1:2, of axle box for rolling stock

Wooden model, scale 1:2, of axle box for rolling stock

1888
Bottle of "Pyoktanin", by E. Merck, German

Bottle of "Pyoktanin", by E. Merck, German

Bottle of "Eupaverin" ( contains papaverine hydrochloride) with cork stopper. 45 mm x 24 mm diameter, 20g. Produced by E. Merck Chemical Works, German, 1920-1950.

Small bottle of 'Europavin'

1920-1950
Model, showing Scribing marking, preparation for Oblique carpentry joint, on single beech-wood block: stamped with ‘2’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, showing Scribing marking

1868
Model, of Oblique Dovetail Halving carpentry joint, with round peg fitted, joining two beech-wood blocks: stamped with ‘53’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Oblique Dovetail Halving carpentry joint

1868
Model, of Tusk Tenon carpentry joint, with Wedge, joining two beech-wood blocks: stamped with ‘56’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Tusk Tenon carpentry joint

1868
Model, of Crossed Tenon carpentry joint, on single beech-wood block: stamped with ‘35’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868. This was constructed to fit (1868-31/19) Model, of Crossed Tenon carpentry joint, on single beech-wood block: stamped with ‘35’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868.

Model, of Crossed Tenon carpentry joint

1868
Model, of Dovetail-Halving ‘Socket’ carpentry joint, on single beech-wood block: stamped with ‘38’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868. This was constructed to fit with (1868-31/33) Model, of Dovetail-Halving ‘Tail’ carpentry joint, on single beech-wood block: stamped with ‘38’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868.

Model, of Dovetail-Halving ‘Socket’ carpentry joint

1868
Model, of Bevel-Lap carpentry joint, with a central round peg fitted, joining two beech-wood blocks: stamped with ‘28’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Bevel-Lap carpentry joint

1868
Model, of Under-Squinted and Tabled Scarf carpentry joint, with centre wedge fitted, joining two beech-wood blocks: stamped with ‘21’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Under-Squinted and Tabled Scarf carpentry joint

1868
Model, of Triple-Notched Secret Mortice and Tenon carpentry joint, with two round pegs fitted, joining two beech-wood blocks: stamped with ‘64’ and over-laid in ink, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Triple-Notched Secret Mortice and Tenon carpentry joint

1868
Model, of Dovetail carpentry joint, joining two beech-wood blocks: stamped with ‘30’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Dovetail carpentry joint

1868
Model, of Secret Bridle carpentry joint, joining two beech-wood blocks: stamped and over-laid in ink with ‘49’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Secret Bridle carpentry joint

1868
Model, of Secret Mortice and Tennon carpentry joint, joining two beech-wood blocks: stamped with ‘58’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Secret Mortice and Tennon carpentry joint

1868
Model, of Oblique Dovetail Halving carpentry joint, joining two beech-wood blocks: stamped with ‘43’ on block with Dovetail ‘Socket’; and stamped, plus written in ink with ‘43’ on block with Dovetail ‘Tail’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Oblique Dovetail Halving carpentry joint

1868
Model, of Oblique Bridle carpentry joint, with round peg fitted, joining two beech-wood blocks: stamped with ‘11’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Oblique Bridle carpentry joint

1868
Model, of Dovetail Cross-Lap ‘Tail’ carpentry joint, with only one shouldered side, on single beech-wood block: stamped with ‘36’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868. This was constructed to fit (1868-31/40) Model, of Dovetail Cross-Lap ‘Socket’ carpentry joint, with only one shouldered side, on single beech-wood block: stamped with ‘36’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868.

Model, of Dovetail Cross-Lap ‘Tail’ carpentry joint

1868
Model, of Tabled Scarf carpentry joint with centre wedge fitted, joining two radiused beech-wood blocks: written in ink with ‘69’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Tabled Scarf carpentry joint with centre wedge fitted

1868
Model, of Tenoned Scarf carpentry joint, with central wedge fitted, joining two beech-wood blocks: stamped with ‘17’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Tenoned Scarf carpentry joint

1868
Model of portion of involute mortise spur wheel, teaching model / J Schröder, Germany, 1868

Model of Portion of Involute Mortise Spur Wheel

1868
Model, of Oblique Double-Notched Secret Mortice and Tenon carpentry joint, with hole for round peg (not present), joining two beech-wood blocks: stamped with ‘63’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Oblique Double-Notched Secret Mortice and Tenon carpentry joint

1868
Model, of Dovetail and Tabled Scarf carpentry joint, joining two beech-wood blocks: stamped with ‘14’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Dovetail and Tabled Scarf carpentry joint

1868
Model, of Mitre carpentry joint, with pencil marks for Dovetail Housing carpentry joint, on single beech-wood block: stamped with ‘24’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868. This was constructed to fit with (1868-31/17) Model, of Mitre carpentry joint, with pencil marks for Dovetail Housing carpentry joint, on single beech-wood block: stamped with ‘24’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868.

Model, of Mitre carpentry joint

1868
Model, of Secret Oblique Shouldered Mortice and Tenon carpentry joint, joining two beech-wood blocks: stamped with ‘44’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Secret Oblique Shouldered Mortice and Tenon carpentry joint

1868
Juglandin. A sample chemical from Edward Schunck's work on natural dyes and plant products, 1840s-1900. Prepared by E. Merek, Darmstadt‎, Germany.

Juglandin, a sample chemical

1840s-1900
Two Models, of Cross-Half Secret Bridle carpentry joint, joining two beech-wood blocks: one a ‘Socket’, the other a ‘pin’, both stamped with ‘32’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Two Models

1868
Model, of Double-Bridle carpentry joint, with a central round peg fitted, joining two beech-wood blocks: stamped with ‘27’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Double-Bridle carpentry joint

1868
Model, of Tenoned Scarf carpentry joint, with oblique shoulders carpentry joint, with two round pegs fitted, joining two beech-wood blocks: stamped with ‘13’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Tenoned Scarf carpentry joint

1868
Model, of Stopped Housing carpentry joint ‘Socket’, with bevelled leading edge, on single beech-wood block: stamped with ‘46’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868. This was constructed to fit with (1868-31/48) Model, of Stopped Housing carpentry joint ‘Pin’, with bevelled leading edge, on single beech-wood block: stamped with ‘46’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868.

Model, of Stopped Housing ‘Socket’ carpentry joint

1868