Plant growth unchanged by ultra-violet glass
✍ Scribed by T.K.C.
- Publisher
- Elsevier Science
- Year
- 1932
- Tongue
- English
- Weight
- 58 KB
- Volume
- 213
- Category
- Article
- ISSN
- 0016-0032
No coin nor oath required. For personal study only.
✦ Synopsis
CURRENT TOPICS. 349
cent. of the power required to propel them at speeds above 6o miles per hour. The weight per horse power of the 6oo-volt motors has been reduced from the usual value of 30 to 35 lb. per hp. to 26.8 lb. per hp. Self-ventilation of the motors has been improved by a fan mounted on the commutator end of the shaft. An improved motor control system automatically holds the starting currents at the highest permissible values, thus giving maximum acceleration at all times. There are four IOO hp. motors in each of these 52-passenger cars and the running time of express cars from Norristown to the 69th street station will be cut from 24 to 16 minutes.
T. K. C.