WHY DO WAGON WHEELS SOME­TIMES SEEM TO MOVE SLOWLY IN OLD FILMS?

BBC Earth (Asia) - - Science -

Films are shot as a se­ries of in­di­vid­ual frames taken at around 24 per sec­ond. If the wagon wheel is ro­tat­ing at pre­cisely the right rate, then a spoke in one frame will have been taken up by an­other spoke in the next frame, cre­at­ing the im­pres­sion the wheel is sta­tion­ary. If they’re slightly out of sync, how­ever, the wheels will ap­pear to move in slow mo­tion. RM

Newspapers in English

Newspapers from Singapore

© PressReader. All rights reserved.