. Electric railway journal . isk centertype, having the brake shoes acting on both sides ofthe wheels. All pin joints in the brake gear are bushedwith renewable bushings and case-hardened pins. Thetruck frames are of solid construction and consist ofplate frames well stiffened with cast steel corner cast-ings. Advantage has been taken of the latter forsupporting the brake beams and levers. Side louvresare provided in addition to roof ventilators. New Belt-Driven Air Compressors THE Ingersoll-Rand Company, New York, has an-nounced a new line of belt-driven air compressors,known as the Imperial
. Electric railway journal . isk centertype, having the brake shoes acting on both sides ofthe wheels. All pin joints in the brake gear are bushedwith renewable bushings and case-hardened pins. Thetruck frames are of solid construction and consist ofplate frames well stiffened with cast steel corner cast-ings. Advantage has been taken of the latter forsupporting the brake beams and levers. Side louvresare provided in addition to roof ventilators. New Belt-Driven Air Compressors THE Ingersoll-Rand Company, New York, has an-nounced a new line of belt-driven air compressors,known as the Imperial Type XCB. Features ofconstruction include plate valves, for both the air intakeand discharge, and five-step clearance control for regu-lating the compressors output. The plate valves used in this type of compressor arethe result of a complete analysis of the light-weightplate type of valve. They include features which havebeen found necessary to the functioning of this typeof valve, the most important of these being that the. Belt-Driven Air Compressor valve is supported throughout its entire operation inperfect alignment without any form of wearing guide. With the clearance control the compressor is auto-matically loaded or unloaded in five successive steps,these steps being obtained by the reduction or additionof clearance space to the air cylinders. The compressorwill operate at full, three-quarter, one-half, one-fourthand no loads. In the four cities clustered together on the east sideof San Francisco Bay 3,353 residential building permitswere issued during the eighteen months ended June 30,1921, notes the Engineering News-Record, and of these85 per cent were within three blocks of street car estimated cost of this 85 per cent was $15,030,412,as against $1,433,355 for the remainder. October 15, 1921 Electric Railway Journal 695 Accountants Association Proceedings Three-Day Session Covers Wide Range—Discussion Centered Around Electric Railway Cost Accountingfor B
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