Brooks Paraffine Insulators unaffected by temperature

The Paraffine Insulators.

A WRITER, in a recent number of our official contemporary, having attempted to demonstrate that heat and cold had a damaging effect on the celebrated Paraffine Insulator, invented and manufactured by Mr. DAVID BROOKS, we have been requested to publish the following letter on that subject:

HARRISON BROS. & CO.,

Proprietors of the Gray's Ferry and Kensington White Lead, Color and Chemical Works, connected by 125 miles of private telegraph wire with their offices, No. 16 Burling Slip, New York, and 105 South Front street, Philadelphia. Dec. 22, 1868.

MR. DAVID BROOKS.

Dear Sir - In the last issue of the Journal of the Telegrapher there is an article, the object of which is to show theoretically that the insulating properties of your insulator are affected by heat and cold. As the wire of ours, insulated with your insulator of the improved form, has stood the test since September 1867, we desire to say that we made a very thorough test on the 16th inst., while it was storming heavily, and worked the 115 miles without perceptible escape; while our factory wires, with the ordinary insulators, only 10 miles is length, were used with difficulty.

Yours respectively,

HARRISON BROS. & CO.