. Electric railway review . a-tion, advantages claimed for it and giving tin cost. Automatic Oil Cup Company, 155 Huron St., Milwaukee. Wis.—This company has published ■., bulletin describing tic Bangs auto-matic oil cup which is the invention of Mr. E. D. Bangs of .Mil-waukee. The oil cup ned to feed oil to journals in erathe quantity needed. It is simple and compact in mechanical con-tion, being made entirely of aluminum, brass or iron. Allis-Chalmers Company, Milwaukee, Wis.—Bulletin No. 1044deals with the subject of the II Ward Leonard System of Mul-tiple Voltage Control for Variable Speed
. Electric railway review . a-tion, advantages claimed for it and giving tin cost. Automatic Oil Cup Company, 155 Huron St., Milwaukee. Wis.—This company has published ■., bulletin describing tic Bangs auto-matic oil cup which is the invention of Mr. E. D. Bangs of .Mil-waukee. The oil cup ned to feed oil to journals in erathe quantity needed. It is simple and compact in mechanical con-tion, being made entirely of aluminum, brass or iron. Allis-Chalmers Company, Milwaukee, Wis.—Bulletin No. 1044deals with the subject of the II Ward Leonard System of Mul-tiple Voltage Control for Variable Speed Motoi . Oomplelscrlptive matter, together with diagrams and a number of half-tone engravings showing machines driven by Allis-Chalmers mo-tors, operated on the H. Warn . system,are presented. I in No. 115 Is an Insti iok entitledDirections for Erecting Elevator! This is a companionpublication to Bulletin No. 1115 which describes the Gates rock andore br-aker. Bulletin No. 1038 describes Allis-Chalmers alternat-. Small Condenser for Improving Telephone Service. .one in series with tJ secondary 0 oil This condenser, known as No. 10, is made of tin-foiland rice paper, like ordinary telephone condensers, and is quite iches (including Is) by 1. by •■■ inches. The manufacturer furnishes this condenser as apart of Its telephone sets, or separately. For the latter purposethe Kellogg company furnishes a small brass strap to hold thecomi phone cabin. ondei ■ as follows: The fri i telephone ringing current as generated by ;■ ti ordinary hand generator atlie usual rate of turning the crank is about 1,000 cycles per mln- 242 ELECTRIC RAILWAY REVIEW Vol XVII, No. 7. To current of this frequency the condenser offers an impe-dance of about 10,000 ohms so that when tin- receiver Is down theringing current is not shunted. On the other hand, the frequencyof voice currents is so high that these currents pass through thecondenser very readily and the efficiency of the re
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