Table IV.—Table for Reducing Observations of the Barometer toSea Level, Correction Additive.
Height, in feet.Temperature of external air—degrees Fahrenheit.-20°-10°0°10°20°30°40°50°60°70°80°90°100°10.013.013.012.012.012.012.011.011.011.011.010.010.01020.026.025.025.024.023.023.023.022.022.021.021.020.02030.039.038.037.036.035.034.034.033.032.032.031.030.03040.052.050.049.048.047.046.045.044.043.042.041.040.04050.065.063.061.060.059.058.056.055.054.053.052.051.05060.077.076.074.072.070.069.068.066.065.063.062.061.05970.090.088.086.084.082.081.078.077.076.074.072.071.06980.103.101.098.096.094.092.090.088.086.084.082.081.07990.116.113.111.108.105.104.101.099.097.095.093.091.089100.129.126.123.120.117.115.112.110.108.105.103.101.099110.142.139.135.132.129.126.123.121.119.116.113.111.109120.155.151.148.144.140.138.134.132.129.126.124.121.119130.168.164.160.156.152.149.146.143.140.137.134.131.129140.181.176.172.168.164.161.157.154.151.147.144.141.139150.194.189.185.180.176.172.168.165.162.158.155.152.149160.206.201.197.192.187.183.179.176.172.168.165.162.158170.219.214.209.204.199.195.190.187.183.179.175.172.168180.232.227.222.216.211.206.202.198.194.189.185.182.178190.245.239.234.228.222.218.213.209.204.200.196.192.188200.258.252.246.240.234.229.224.220.215.210.206.202.198210.271.264.258.252.246.240.235.231.226.221.216.212.208220.284.277.270.264.257.252.246.242.236.231.227.222.218230.296.289.283.276.269.263.257.253.247.242.237.232.228240.309.302.295.288.281.275.269.264.258.252.248.242.238250.322.314.307.300.293.286.280.275.269.263.258.253.248260.335.327.319.311.304.297.291.285.279.273.268.263.257270.348.339.331.323.316.309.302.296.290.284.278.273.267280.360.352.344.335.328.320.314.307.301.294.288.283.277290.373.364.356.347.339.332.325.318.311.305.299.293.287300.386.377.368.359.351.343.336.329.322.315.309.303.297310.399.389.380.371.363.354.347.340.333.326.319.313.307320.412.402.392.383.374.366.358.351.343.336.329.323.317330.424.414.404.395.386.377.369.362.354.347.340.333.326340.437.427.416.407.397.389.380.373.365.357.350.343.336350.450.439.429.419.409.400.392.384.376.368.360.353.346360.463.451.441.430.421.411.403.394.386.378.370.363.356370.476.464.453.442.432.423.414.405.397.389.380.373.366380.488.476.465.454.444.434.425.416.408.399.391.383.375390.501.489.477.466.455.446.436.427.418.410.401.393.385400.514.501.489.478.467.457.447.438.429.420.411.403.395410.527.513.501.490.479.468.458.449.440.430.421.413.405420.539.526.513.502.490.480.469.460.450.441.431.423.415430.552.538.525.513.502.491.480.470.461.451.442.433.425440.565.551.537.525.513.502.491.481.471.462.452.443.434450.578.563.550.537.525.513.503.492.482.472.462.453.444460.590.575.562.549.537.525.514.503.493.482.472.463.454470.603.588.574.561.548.536.525.514.503.493.482.473.464480.616.600.586.572.560.547.536.524.514.503.493.483.474490.628.613.598.584.571.559.547.535.524.514.503.493.483500.641.625.610.596.583.570.558.546.535.524.513.503.493510.654.637.622.608.594.581.569.557.545.534.523.513.503520.666.650.634.620.606.593.580.568.556.545.533.523.513530.679.662.646.631.617.604.591.578.566.555.544.533.522540.691.675.658.643.629.615.602.589.577.565.554.543.532
Table IV.—For Reducing Observations of the Barometer to SeaLevel.—Continued.
Height, in feet.Temperature of external air—degrees Fahrenheit.-20°-10°0°10°20°30°40°50°60°70°80°90°100°550.704.687.670.655.640.626.613.600.587.575.564.553.542560.717.699.683.667.652.638.624.611.598.586.574.563.552570.729.712.695.679.663.649.635.622.608.596.584.573.562580.742.724.707.690.675.660.646.632.619.606.595.583.571590.754.737.719.702.686.672.657.643.629.617.605.593.581600.767.749.731.714.698.683.668.654.640.627.615.603.591610.780.761.743.726.709.694.679.665.650.637.625.613.601620.792.774.755.738.721.705.690.675.661.648.635.623.611630.805.786.767.749.732.717.701.686.671.658.645.633.620640.817.798.779.761.744.728.712.697.682.668.655.643.630650.830.811.791.773.755.739.723.708.692.679.666.653.640660.843.823.803.785.767.750.734.718.703.689.676.662.650670.855.835.815.797.778.761.745.729.713.699.686.672.660680.868.847.827.808.790.773.756.740.724.709.696.682.669690.880.860.839.820.801.784.767.750.734.720.706.692.679700.893.872.851.832.813.795.778.761.745.730.716.702.689710.905.884.863.844.824.806.789.772.755.740.726.712.698720.918.896.875.855.836.817.800.782.766.751.736.722.708730.930.909.887.867.847.829.811.793.776.761.746.732.718740.943.921.899.879.859.840.822.804.787.771.756.742.728750.955.933.911.891.870.851.833.815.797.782.767.752.738760.968.945.922.902.881.862.843.825.808.792.777.761.747770.980.957.934.914.893.873.854.836.818.802.787.771.757780.993.970.946.926.904.885.865.847.829.812.797.781.7677901.005.982.958.937.916.896.876.857.839.823.807.791.7768001.018.994.970.949.927.907.887.868.850.833.817.801.7868101.0301.006.982.961.938.918.898.878.860.843.827.811.7968201.0431.018.994.972.950.929.909.889.871.854.937.821.8058301.0551.0311.006.984.961.940.920.900.881.864.847.831.8158401.0681.0431.018.995.973.951.931.911.892.874.857.841.8258501.0801.0551.0301.007.984.962.942.922.902.885.867.851.8358601.0931.0671.0411.019.995.974.952.932.913.895.877.860.8448701.1051.0791.0531.0301.007.985.963.943.923.905.887.870.8548801.1181.0921.0651.0421.018.996.974.954.934.915.897.880.8648901.1301.1041.0771.0531.0301.007.985.904.944.926.907.890.8739001.1431.1161.0891.0651.0411.018.996.975.955.936.917.900.8839101.1551.1281.1011.0771.0521.0291.007.986.965.946.927.910.8939201.1681.1401.1131.0881.0641.0401.018.996.976.956.937.920.9029301.1801.1521.1251.1001.0751.0511.0291.007.986.967.947.929.9129401.1931.1641.1371.1111.0861.0621.0401.017.997.977.957.939.9219501.2051.1771.1491.1231.0981.0741.0511.0281.007.987.967.949.9319601.2171.1891.1601.1351.1091.0851.0611.0391.017.997.977.959.9419701.2301.2011.1721.1461.1201.0961.0721.0491.0281.007.987.969.9509801.2421.2131.1841.1581.1311.1071.0831.0601.0381.018.997.978.9609901.2551.2251.1961.1691.1431.1181.0941.0701.0491.0281.007.988.96910001.2671.2371.2081.1811.1541.1291.1051.0811.0591.0381.017.998.97910101.2791.2491.2201.1921.1651.1401.1161.0921.0691.0481.0271.008.98910201.2921.2611.2321.2041.1771.1511.1271.1021.0801.0581.0371.018.99810301.3041.2731.2431.2151.1881.1621.1371.1131.0901.0691.0471.0271.00810401.3171.2851.2551.2271.1991.1731.1481.1231.1011.0791.0571.0371.01710501.3291.2981.2671.2381.2111.1841.1591.1341.1111.0891.0671.0471.02710601.3411.3101.2791.2501.2221.1951.1701.1451.1211.0991.0771.0571.03710701.3541.3221.2911.2611.2331.2061.1811.1551.1321.1091.0871.0671.04610801.3661.3341.3021.2731.2441.2171.1911.1661.1421.1201.0971.0761.05610901.3791.3461.3141.2841.2561.2281.2021.1761.1531.1301.1071.0861.065
Table IV.—For Reducing Observations of the Barometer to SeaLevel.—Continued.
Height, in feet.Temperature of external air—degrees Fahrenheit.-20°-10°0°10°20°30°40°50°60°70°80°90°100°11001.3911.3581.3261.2961.2671.2391.2131.1871.1631.1401.1171.0961.07511101.4031.3701.3381.3071.2781.2501.2241.1981.1731.1501.1271.1061.08511201.4161.3821.3501.3191.2891.2611.2351.2081.1841.1601.1371.1151.09411301.4281.3941.3611.3301.3011.2721.2451.2191.1941.1701.1471.1251.10411401.4401.4061.3731.3421.3121.2831.2561.2291.2041.1801.1571.1351.11311501.4531.4181.3851.3531.3231.2941.2671.2401.2151.1911.1671.1451.12311601.4651.4301.3971.3651.3341.3051.2781.2511.2251.2011.1771.1541.13311701.4771.4421.4091.3761.3451.3151.2891.2611.2351.2111.1871.1641.14211801.4891.4541.4201.3881.3571.3271.2991.2721.2451.2211.1971.1741.15211901.5021.4661.4321.3991.3681.3381.3101.2821.2561.2311.2071.1831.16112001.5141.4781.4441.4111.3791.3491.3211.2931.2661.2411.2171.1931.17112101.5261.4901.4561.4221.3901.3601.3321.3031.2761.2511.2271.2031.18012201.5391.5021.4671.4341.4011.3711.3421.3141.2881.2611.2371.2121.19012301.5511.5141.4791.4451.4131.3821.3531.3241.2971.2711.2471.2221.19912401.5631.5261.4911.4571.4241.3931.3641.3351.3071.2811.2571.2321.20912501.5761.5381.5021.4681.4351.4041.3741.3451.3171.2911.2661.2421.21812601.5881.5501.5141.4791.4461.4151.3851.3561.3281.3021.2761.2511.22812701.6001.5621.5261.4911.4571.4261.3961.3661.3381.3121.2861.2611.23712801.6121.5741.5381.5021.4691.4371.4071.3771.3481.3221.2961.2711.24712901.6251.5861.5491.5141.4801.4481.4171.3871.3591.3321.3061.2801.25613001.6371.5981.5611.5251.4911.4591.4281.3981.3691.3421.3161.2901.26613101.6491.6101.5731.5361.5021.4701.4391.4081.3791.3521.3261.3001.27513201.6611.6221.5841.5481.5131.4811.4491.4191.3901.3621.3361.3091.28513301.6741.6341.5961.5591.5251.4921.4601.4291.4001.3721.3461.3191.29413401.6861.6401.6081.5711.5361.5031.4711.4401.4101.3821.3561.3291.30413501.6981.6581.6201.5821.5471.5141.4821.4501.4201.3931.3661.3391.31313601.7101.6691.6311.5931.5581.5241.4921.4611.4311.4031.3751.3481.32318701.7221.6811.6431.6051.5691.5351.5031.4711.4411.4131.3851.3581.33213801.7351.6931.6551.6161.5811.5461.5141.4821.4511.4231.3951.3681.34213901.7471.7051.6661.6281.5921.5571.5241.4921.4621.4331.4051.3771.35114001.7591.7171.6781.6391.6031.5681.5351.5031.4721.4431.4151.3871.36114101.7711.7291.6901.6501.6141.5791.5461.5131.4821.4531.4251.3971.37014201.7831.7411.7011.6621.6251.5901.5561.5241.4921.4631.4351.4061.38014301.7961.7531.7131.6731.6361.6011.5671.5341.5031.4731.4441.4161.38914401.8081.7651.7241.6851.0471.6121.5771.5451.5131.4831.4541.4261.39914501.8201.7771.7361.6961.6581.6231.5881.5551.5231.4931.4641.4361.40814601.8321.7881.7481.7071.6701.6331.5991.5651.5331.5031.4741.4451.41814701.8441.8001.7591.7191.0811.6441.6091.5761.5431.5131.4841.4551.42714801.8571.8121.7711.7301.6921.6551.6201.5861.5541.5231.4931.4651.43714901.8691.8241.7821.7421.7031.6661.6301.5971.5641.5331.5031.4741.44615001.8811.8361.7941.7531.7141.6771.6411.6071.5741.5431.5131.4841.456