Complete set of cardboard models of second order surfaces in original packing by L. Brill of Darnstadt circa 1900
Wooden model, scale 1:2, of axle box for rolling stock Wooden model, scale 1:2, of axle box for rolling stock 1888
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
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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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, 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 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 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 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
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 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 Half-Lap carpentry joint, with a central round peg fitted, joining two beech-wood blocks: stamped with ‘25’, by Polytechnisches Arbeits-Institut J. Schröder Atkiens-Gesselleschaft, Darmstadt, Hesse, Germany, 1868 Model, of Half-Lap 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 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 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 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 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 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 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 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 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 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