Font used in 1920s mathematics textbook

[pietro]

Hello, does anyone recognise the font used in this old textbook?  Being in the library a lot, I see this font very often, so the image attached is just one specific example, but I believe it is (was) a popular font. Thanks!

[Riccardo Sartori]

Century Expanded, available from many foundries:

download at MyFonts

 

30 minutes ago, pietro said:

I believe it is (was) a popular font.

You are indeed correct.

[pietro]

1 hour ago, Riccardo Sartori said:

Century Expanded, available from many foundries:

download at MyFonts

 

You are indeed correct.

Grazie!