Part 1. Air-Density Nomogram
Align (B) and (T) to get point on support (D).
Align (D) with (R) to get error in yards due to change in density of air.
EXAMPLE:
Given:
Barometer...........................29.1 inches.
Temperature.......................80 F.
Range................................8,000 yards.
Result:
Error..................................+210 yards.
Note.----The best estimate of ballistic density to different altitudes is in very close, but not in exact agreement with standard density when surface conditions are
standard. When surface density is not standard the disagreement is usually greater and is a function of surface density and maximum ordinate. Use of this nomogram
will not give agreement with results obtained from Column 12 and surface observations only, but should be a more accurate figure, in that it takes into account the
ratio between mean measured and standard density for the actual maximum ordinate obtained.
PAGE 465
Align (B) and (T) to get point on support (D).
Align (D) with (R) to get error in yards due to change in density of air.
EXAMPLE:
Given:
Barometer...........................29.1 inches.
Temperature.......................80 F.
Range................................8,000 yards.
Result:
Error..................................+210 yards.
Note.----The best estimate of ballistic density to different altitudes is in very close, but not in exact agreement with standard density when surface conditions are
standard. When surface density is not standard the disagreement is usually greater and is a function of surface density and maximum ordinate. Use of this nomogram
will not give agreement with results obtained from Column 12 and surface observations only, but should be a more accurate figure, in that it takes into account the
ratio between mean measured and standard density for the actual maximum ordinate obtained.
PAGE 465
| GENE SLOVER'S US NAVY PAGES Appendix C, Part 1 EXTRACTS FROM 5”/38 RANGE TABLE (AND ASSOCIATED MATERIAL) |
