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The elements of the arch. A. abutments; S. springers; V. voussoirs; I. imposts; In. intrados; K. keystone; P. piers; Ex. extrados.

Arch

The elements of the arch. A. abutments; S. springers; V. voussoirs; I. imposts; In. intrados; K. keystone;…

The Great Bridge over the Charles River connected Cambridge, Massachusetts to Little Cambridge, which was the name for Allston-Brighton before it separated from Cambridge in 1807, first becoming the town of Brighton and finally joining the city of Boston in 1874. The Great Bridge was built in 1660-1662 at what was then called Brighton Street, and was the first bridge to span the Charles. A toll was authorized in 1670, rebuilt in 1862.

Great Bridge at McConkey's Ferry

The Great Bridge over the Charles River connected Cambridge, Massachusetts to Little Cambridge, which…

A diagram consisting of a section of a span-roofed pit. These pits are useful for plant culture. A, Ordinary Soil; b, Passage; c, Heated Chambers; d, Plunging Beds; e, Hot-Water Pipes.

Section of Span-Roofed Pit

A diagram consisting of a section of a span-roofed pit. These pits are useful for plant culture. A,…