416th BG Op Report - Form 34A - Bombs and ammo quuestion

[Leendert]

A 416th BG Operations Report (as an example the one of 28 May 1944 to Bruges/St. Michiels) says under Letter F.:

(i) A-20G's 144 x 500 lb GP 1/10 N, 1/40 T
A-20J's 24 x 500 lb GP 1/10 N, 1/40 T
(ii) A-20G's 141 x 500 lb GP
A-20J's 24 x 500 lb GP
(iii) A-20G 1 x 500 lb GP
(iv) None.
A-20G 1 x 500 lb GP delayed release - cause undetermined
A-20G 1 x 500 lb GP returned to base - arming wire held release
breaker open.

Item i is bombs carried. What is 1/10 N and 1/40 T? Detonation settings?

Item ii bombs released on target

Item iii = ?

Item iv: "None" here means? With the two bombs not on target (one delayed and one returned), then the third "missing" bomb (144 - 141 for the A-20G) must be item iii?

Thanks for all info!

Regards,

Leendert