Recorded in several spellings including Langston and Langstone, this is an English surname. It is of locational origin from any of various places so called but specifically Langston in the counties of Devonshire and Hampshire.
Use Speed dial to call a phone number with a single tap. 1  Open the Phone app. 2  Tap. 3  You can also press and hold an unassigned key on the dialpad, and then tap Yes. 4  Select a contact from the list. 5  On the Speed dial screen, choose the phone number of the contact to use, and a speed dial key to assign. 6  Tap Save.
Induction Motor Calculator. Calculate the synchronous speed, slip and rated torque for an induction motor. A value is required!Integer number between 300 and 3600 is required! A value is required!Integer number between 0 and 6000000 is required! Tip: registered users can save calculations.