of the suspensionbridge in which catenary chains supported the floor.
The first was erected over the Tees, in England, in 1741.
Rods with eyes and connecting-links were used by Telford on the Menai Suspension Bridge, 1829; steel wires laid up (not
The first application of change-wheels to a lathe is supposed to have been in a fusee-cutting lathe, described in a work, 1741.
The change-wheels are intermediate, and journaled in a bracket, which permits them to be brought into engagement with thoses of astronomy as early as 1484.
Gemma Trosius, in 1530, suggested their use at sea for acertaining the longitude.
In 1741, the English government offered a reward of £ 20,000 for a correct mode of determining longitude at sea. This was won by Hprime conductor collects and transmits the frictional electricity of the electrical machine.
It was introduced by Bose in 1741.
A lightning-conductor, for conducting the static or tension electricity of the atmosphere harmlessly to the earth.