The Thomson Houston system also furnish lightning arresters, ammeters, hanging boards, switchboards, hoods, insulators, lamp arms, etc, but, though in some respects many of these miscellaneous articles are ingenious and novel, yet they are not distinctive of the Thomson Houston or any other system. Be it said however that all these articles fill their proper places. The company also furnish a motor to go on their circuits but for the double reason that of the motor not being strictly related to electric lighting and of being unable to obtain a description of it, it must remain undescribed as far as this thesis is concerned.

After describing all the parts of the system it may be interesting to know how a plant is arranged. The last plate is a photograph of the LaFayette Gas Company’s Plant of the Thomson Houston System taken at ten oclock one night. It shows the engine, dynamos, the wall controller on the left wall, and a view of the lamps which had hoods put before them to prevent the polarization of the negative.

On the accompanying page will be found a table showing experiments with an old style dynamo given Purdue University by the Thomson Houston Company, which dynamo is now in the engine house of the Mechanical Hall.