David Brooks has a pamphlet out on his paraffine insulators

The Brooks Insulator.

DAVID BROOKS has issued a circular pamphlet in reference to his Patent Paraffine Insulator. This circular contains about forty certificates. Some are from the highest authorities in this country and in Europe. Professor MORSE, in his late report to Congress, speaks of this invention in the highest terms.

Besides certificates, the pamphlet contains an interesting article on the subject of insulation. The American certificates are from railroad companies who have adopted this insulator with great success.

But the greatest proof of its worth is the guarantee of the inventor. This guarantee is to exceed the ordinary glass insulator, in wet weather, one hundred times, which is equivalent to exceeding the English standard of a meghom per mile fifty times; and he agrees to maintain for any length of time this immense difference, at a compensation of two dollars per mile per annum, for one wire, and three dollars per mile for two wires.

Although the first cost of this insulator is about twice that of the ordinary insulator, the subsequent cost of maintenance makes the Paraffine Insulator much the cheaper, not taking into account the vast difference in results obtained.