B-type

A way of denoting the emulsion position in 16mm film.

To identify a B-type on a winding bench the following formula is used:

Head to the right, perforations towards you and if the emulsion is upward then it is B-type.

Please note that this formula does not work for double perforation 16mm.

https://www.nfsa.gov.au/sites/default/files/uploads/2010/08/23/atype.jpg