The calculator permits estimation of a nuclear yield when the

illumination time is known. Yield can also be estimated when flash-to-

bang time (or distance to ground zero) and any one of the following cloud

parameters are known.

Nuclear burst angular cloud width at H + 5 minutes

Stabilized cloud-bottom angle at H + 10 minutes

Stabilized cloud-top angle at H + 10 minutes.

Instructions for use of the calculator are printed on the calculator.

Included as a component of the M28A1 Calculator Set is a plastic

separator card with practice problems and solutions using the M4A1

Calculator on one side (Figure 2-5).