Reports OF Judges. 115 



currents, and the resistance of electro magnets. The galvanometer 

 is different from any heretofore constructed, being composed, of a 

 series of needles placed side by side. 



It is claimed that the deflection of the needle in this instrument 

 when under the influence of electro currents is directly proportional 

 to the angles themselves, and not to the tangent of the angle, as is 

 the case with a single needle. For ordinary use this form is pre- 

 ferable, but for delicate observations in weak currents, we would 

 prefer a single needle. 



The invention, hoAvever, is worthy of honorable mention in the 

 report of the board of managers. 



No. 966. The Telegraph Register. (L. G. Tillotson & Co.) 

 This register we regard the best on exhibition. The method of 

 shifting the fillet of paper, although not new, is convenientj the 

 general construction of the instrument is good. We recommend a 

 second premium. 



No. 42. Sub-Marine Cables. (The Bishop Gutta Percha Com- 

 pany.) In this case there was a large number of specimens of 

 sub-marine cables. Of the relative or absolute value of these 

 specimens, the judges had no positive knowledge, but as an encour- 

 agement to American manufacture, we would recommend a third 

 premium. 



No. 1157. Parafine Telegraph Insulator. ("William E. Allison.) 

 Tests have been made by competent persons, showing that in damp 

 or rainy weather there is less escape of electricity over these insu- 

 lators than any other in use. It may be objected, however, that 

 their cost is much greater than for the glass and bracket in othtr 

 forms. As the problem of telegraph insulation is a very important 

 one, any indention tending towards its solution should receive all 

 needful encouragement. We accordingly recommend a third pre- 

 mium. 



No. 467. Magnetic Railway Switch Alarm Signal. (Thomas S. 

 Hall.) This method if properly carried out, we regard as of great 

 value, in preventing a certain class of railroad accidents; it is new. 

 We recommend a first premium. 



No. 1038. Electro Medical Apparatus. (Jerome Kidder.) With- 

 out admitting the value of direct or indirect currents of electricity 

 for the cure of disease, yet we regard this apparatus as the most 

 complete of the kind in use. 



No. 831. Dion's Fire Detector and Alaim Bell Apparatus. 

 (American Fire Detector Company.) This device is simple and 



