Science . many Industrial Concerns are using our rtl 3640 - 42 N. Second St. Rheostats with entire satis- r^ PHILADELPHIA, PA. taction. t^S^^A Again Available Microscopic Slide Trays Durably made of double weight faced cardboard. Inserts forslides are numbered, have white background and are depressed oneither side to facilitate removal. Covers have printed record indexand are securely fastened with two clamps. No. 14427 Shde Trays—Map Form. To hold fourteen slides. Per dozen $/^.ooNo. 14429 Slide Trays—Map Form. To hold twenty slides. Per dozen ^ Will Corporation Products for Every Laborat
Science . many Industrial Concerns are using our rtl 3640 - 42 N. Second St. Rheostats with entire satis- r^ PHILADELPHIA, PA. taction. t^S^^A Again Available Microscopic Slide Trays Durably made of double weight faced cardboard. Inserts forslides are numbered, have white background and are depressed oneither side to facilitate removal. Covers have printed record indexand are securely fastened with two clamps. No. 14427 Shde Trays—Map Form. To hold fourteen slides. Per dozen $/^.ooNo. 14429 Slide Trays—Map Form. To hold twenty slides. Per dozen ^ Will Corporation Products for Every LaboratoryGuaranteed Vvlthout Reservation R OCHESTER, ;n-y SCIENCE—ADVERTISEMENTS Complete Dynamo Electric Machinery Apparatus For Demonstrating Direct Current Motors and GeneratorsAlternating Current Rotating Field and Induc-tion MotorThe Rotary Converter The Synchronous MotorThe Alternating Current GeneratorThe Transformer and Its PrinciplesTwo or Three Phase Alternating Current Phe-nomena (•S ?s=> ^. This apparatus consists essentially of two fields which may be fitted with poles on which are wound coils andthese fields may have 2, 4, or 6 poles for direct current work or 3 or 6 poles for three phase alternating current work A simple direct current armature is supplied for mounting in this field and with this armature may be demon-strated a series or shunt wound motor or dynamo and all characteristics of direct current dynamo electric machineryof either 2, 4, or 6 poles. This furnishes much valuable information regarding the connections of the different poles,the direction of rotation, etc. The aluminum cup for use in this magnetic field illustrates the principles of the closed circuit rotor for inductionmotors. The reversal of one of the field coils shows reversal of direction of rotation and other similar importantprinciples may be shown. The converter may be demonstrated by placing the armature which has slip rings on one side in the field shownon the right and arrang
Size: 2693px × 928px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjects, booksubjectscience
