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Model of breast water wheel with pentrough sluice

1868

Bottle for Gas-Oedem serum

1900-1910

Model of crank shaft bearing with two adjusments

1888

Demonstration model of a differential gear

1890-1905

Wooden model of footstep bearing for a water turbine

1890

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

circa 1900

Model of two conoidal pulleys with open belt

1888

Wooden model of wall bracket

1868

Two double helical gear wheels in mesh on iron stand

1888

Schwartzkopf's universal spanner

1862-1888
Wooden model, scale 1:2, of axle box for rolling stock

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

1888
Model showing by wire hyperboloidal pitch surfaces of skew level wheels.

Diagrammatical model of hyperboloidal pitch surfaces

circa 1889
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 of portion of involute mortise spur wheel, teaching model / J Schröder, Germany, 1868

Model of Portion of Involute Mortise Spur Wheel

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 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 Under-Squinted Tabled Scarf carpentry joint, on single radiused beech-wood block: over-laid in ink with ‘66’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Under-Squinted Tabled Scarf 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 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
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
Two Models, of Under-Squinted Tabled Scarf carpentry joint, joining two beech-wood blocks: stamped with ‘9.’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Two Models

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 Stopped Housing carpentry joint, with Oblique leading edge, joining two beech-wood blocks: stamped with ‘47’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Stopped Housing carpentry joint

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 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 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 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
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 (1868-31/30) 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 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 (1868-31/63) 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 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 Under-Squinted Lap Scarf carpentry joint, with two round-peg holes, but only one peg fitted, joining two beech-wood blocks: stamped with ‘4’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Under-Squinted Lap Scarf carpentry joint

1868
Model, of Under-Squinted Tabled Scarf with ‘V’ ends carpentry joint and centre wedge fitted, joining two beech-wood blocks: stamped with ‘22’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Under-Squinted Tabled Scarf with ‘V’ ends carpentry joint and centre wedge fitted

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 Mortice and Tenon Scarf carpentry joint, joining two beech-wood blocks: stamped with ‘12’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Mortice and Tenon Scarf carpentry joint

1868
Model, of Secret Mortice and Tenon carpentry joint, with a round peg fitted, joining two beech-wood blocks: both stamped with ‘40’; ‘49’; ‘60’; and ‘65’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Secret Mortice and Tenon carpentry joint

1868
Model, of Oblique Notched Secret Mortice and Tenon carpentry joint, with round peg fitted, joining two beech-wood blocks: both stamped with ‘61’ and ‘52’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Oblique Notched Secret Mortice and Tenon carpentry joint

1868
Model, of Under-Squinted Double-Hooked and Tabled Scarf carpentry joint, with two apertures for wedges, but only one-wedge fitted, joining two beech-wood blocks: one is stamped with ‘26’ and the other is stamped with ‘23’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Under-Squinted Double-Hooked and Tabled Scarf carpentry joint

1868
Model, of Bridle and Secret Halving carpentry joint, with two round pegs fitted, joining three beech-wood blocks: stamped and over-laid in ink with ‘65’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Bridle and Secret Halving carpentry joint

1868
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. This was constructed to fit with (1868-31/49) Model, of Dovetail-Halving carpentry joint ‘Socket’, on single beech-wood block: stamped with ‘38’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868.

Model, of Dovetail-Halving ‘Tail’ 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 Tenoned Under-Squinted and Tabled Scarf carpentry joint, with centre wedge fitted, joining two beech-wood blocks: stamped with ‘20’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Tenoned Under-Squinted and Tabled Scarf 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 Stopped Housing ‘Pin’ carpentry joint, 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 (1868-31/18) Model, of Stopped Housing ‘Pin’ carpentry joint, 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 ‘Pin’ 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 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 Tenoned and Tabled Scarf carpentry joint, with round peg fitted, joining two beech-wood blocks: stamped with ‘18’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868

Model, of Tenoned and Tabled Scarf 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