One of the most common types of bridges for freight trains, our Truss Design Lift Bridge is a working replica of the many lift bridges that have been made over the last 100 years.
Lift bridges became the workhorses of the freight railroads for many years as rail lines expanded over the rivers and ports of the world. The design was particularly useful in areas where there was no room for a bridge to swing, such as a busy industrial port. This bridge uses a small handle and crankshaft to lift the centre span to the top of the truss structure, allowing trolls and other vehicles to safely pass between the two ends.
The kit can be mostly made without glue and taken apart for storage. Snug slot construction and accurate cutting makes this possible!
Based on the classic design at Newcastle-upon-Tyne in the UK, this elegant design has been used for hundreds years around the world. In fact Leonardo da Vinci invented a swing bridge in the 1400's! Swing bridges are still used widely around the world.
Using a wooden bevel gear, the bridge swings open and closed, just like a real swing bridge.
Great for wooden trains and car sets, kids can learn about gears and have the neatest bridge on the block.
· Kit comes complete with easy to follow instructions, all you need are some scissors.
· Comes with great educational information and links to learn more about levers and bridges.
· Easy to make in an hour or two, and has stickers for signs and the road
Probably the coolest bridge we make, this is a replica of the Joseph Strauss design that was made all over North America in the 1920's and 1930's. Well known bridges of this type are the Johnston Street (Blue Bridge) in Victoria, B.C., Wishka River bridge in Washington, the Ashtaula Bridge in Ohio, the Cherry Street bridge in Toronto and the Third Street Bridge in San Francisco.
Sized to fit the wooden train sets, this bridge is an elegant reminder of the cool truss bridges that used to be built years ago and are still in use! Great to use for school bridge studies, and learn more about interesting linkages, this kit will bring a new level of sophistication to playing with wooden cars and trains. Graffiti is not included, but that gives you the chance to be creative!
The bridge was designed by Leonardo Da Vinci between 1485 and 1490, to be built rapidly with local trees, that could be easily slid into place, lashed together, and then crossed quickly, making troop movement over rivers speedy, creating a surprise factor that was critical to success in battles. Leonardo applied the laws of statics, which he had developed during his architectural research. In his journals he wrote laws about friction, one of which stated that if the load on an object is doubled, its friction also doubles. Interestingly, when weight is applied down, it gets tighter and stronger, yet when lifted it falls.
One of Leonardo’s most iconic images, the Aerial Screw (also known as the Helicopter) illustrates the ingenuity of da Vinci, and indicates (along with many other drawings!) his obsession with flying.
While this 15th Century (!) idea may never have got off the ground, for some basic technical reasons, it gave us an insight into the different ways in which Leonardo considered the challenge of human powered flying, and defines him as an inventor well ahead of his time.
Considered by many to be the most powerful and destructive of all the siege engines, the trebuchet took many forms throughout the Medieval world, hurling huge rocks, giant fireballs and even diseased animals at (and into) castles.
This model, based on the Warwolf, is a tabletop working replica of a trebuchet made in the 13th Century.
Standing 26 inches (67 cm) tall by 18 inches (48 cm wide) this model will shoot balls of plasticine (included) over 20 feet! Please be careful of what (or whom) you take aim on, this thing can really let loose.
· Model is pre-cut and each joint is drilled for super strong connection.
· Comes with a leather-like sling and some soft modeling clay for safe hurling!