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HEAT UNITS
POSTAL RATES AND INFORMATION
1,000 watt-hr.
1.34 h.p.-hr.
Effective July 1, 1928
2,654,200 ft.-lb.
3,600,000 joules.
First Class includes all letters and sealed parcels,
3.415 B.t.u.
860 calories.
except parcels sealed under special permission (with
1 Kw.-hr.
367,076 kg.-m.
approved label). It also includes any open letter or
.235 lb. carbon oxidized with perfect
parcel which contains writing (except that DEALERS
efficiency.
or MANUFACTURERS may include a single invoice
3.51 lb. water evap. from and at
and still retain 4th class rates). Typewritten work and
212° F.
carbon copies are first class matter.
22.75 lb. of water raised from 62
First class mail may be registered but cannot be
to 212° F.
insured or sent C. O.
.746 kw.-hr.
Letters and other first-class matter as described above
1,980,000 ft.-lb.
2c for each ounce or fraction thereof.
2,545 heat-units.
273,834 kg.-m.
Registry fee 15c, indemnity to $50.00.
1 h. p.-hr.
.175 carbon oxidized with perfect
Registry fee 20c, indemnity to $100.00.
efficiency.
Return receipt, if desired, 3c additional.
2.618 lb. water evap. from and at
212° F.
Postal Cards. Regular government issue, 1c each.
17.0 lb. water raised from 62° F.
Private Mailing or Post Cards within government
to 212° F.
size limits, written or printed. (Get ruling on over and
14.544 heat-units.
under sizes.) 1c.
1.11 lb. anthracite coal oxidized.
Second Class (transient). Complete copies of news-
2.5 1b. dry wood oxidized.
21 cu. ft. illuminating gas.
papers or periodicals, entered at P. O. as second class
1 1b. carbon OX-
idized with per-=
4.26 kw.-hr.
matter. When mailed by publisher consult the post-
fect efficiency.
5.71 h. p.-hr.
master. When mailed by public 1c for each 2 ounces or
11,315,000 ft.-lb.
fraction thereof regardless of weight or distance.
15 lb. of water evap. from and at
Second class matter may be registered but cannot be
212° F.
insured or sent C. O.
.285 kw.-hr.
.382 h. p.-hr.
Registry fee 15c, no indemnity.
971.7 heat-units.
Return receipt, if desired, 3c additional.
1 water
104,580 kg.-m.
Third Class includes circulars, and other matter
evaporated from =
1,026,000 joules.
and at 212° F.
wholly in print (except second class publications), proof
756,182 ft.-lb.
sheets, corrected proof sheets and manuscript accom-
.06695 of carbon oxidized with per-
fect efficiency.
panying same, merchandise (including farm and factory
Heat
products) and all other mailable matter not included in
the first, second, or fourth classes. Weight limit of this
Centigrade (degrees) = 5/9 (fahrenheit degrees minus 32.)
class: 8 ounces, 11/2c for each 2 oz. or fraction thereof.
Fahrenheit (degrees) = 9/5 (centigrade degrees) plus 32.
Calorie = 3.968 B. t. u.
Over 8 ounces the fourth class (Parcel Post) rates apply.
B. t. u. = .252 calorie.
Exception. Books, catalogues, seeds, bulbs, roots,
Calories per kilogram = 1.8 B. t. u. per pound.
cuttings, scions, and plants (up to 8 oz.), 1 C for 2 oz.
B. t. u. per pound = .5556 calories per kilogram.
or fraction thereof.
Calories per litre = 112.366 B. t. u. per cubic foot.
B. t. u. per cubic =.00898 calories per litre.
Third class matter when mailed in bulk shall be 12c
Calories per cubic meter = 1125 B. t. u. per cubic foot.
for each pound or fraction thereof with the exception
B. t. u. per cubic foot = 8.89 calories per cubic meter.
noted above upon which the rates shall be 8c per pound.
36
37
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"ocrText": "HEAT UNITS\nPOSTAL RATES AND INFORMATION\n1,000 watt-hr.\n1.34 h.p.-hr.\nEffective July 1, 1928\n2,654,200 ft.-lb.\n3,600,000 joules.\nFirst Class includes all letters and sealed parcels,\n3.415 B.t.u.\n860 calories.\nexcept parcels sealed under special permission (with\n1 Kw.-hr.\n367,076 kg.-m.\napproved label). It also includes any open letter or\n.235 lb. carbon oxidized with perfect\nparcel which contains writing (except that DEALERS\nefficiency.\nor MANUFACTURERS may include a single invoice\n3.51 lb. water evap. from and at\nand still retain 4th class rates). Typewritten work and\n212° F.\ncarbon copies are first class matter.\n22.75 lb. of water raised from 62\nFirst class mail may be registered but cannot be\nto 212° F.\ninsured or sent C. O.\n.746 kw.-hr.\nLetters and other first-class matter as described above\n1,980,000 ft.-lb.\n2c for each ounce or fraction thereof.\n2,545 heat-units.\n273,834 kg.-m.\nRegistry fee 15c, indemnity to $50.00.\n1 h. p.-hr.\n.175 carbon oxidized with perfect\nRegistry fee 20c, indemnity to $100.00.\nefficiency.\nReturn receipt, if desired, 3c additional.\n2.618 lb. water evap. from and at\n212° F.\nPostal Cards. Regular government issue, 1c each.\n17.0 lb. water raised from 62° F.\nPrivate Mailing or Post Cards within government\nto 212° F.\nsize limits, written or printed. (Get ruling on over and\n14.544 heat-units.\nunder sizes.) 1c.\n1.11 lb. anthracite coal oxidized.\nSecond Class (transient). Complete copies of news-\n2.5 1b. dry wood oxidized.\n21 cu. ft. illuminating gas.\npapers or periodicals, entered at P. O. as second class\n1 1b. carbon OX-\nidized with per-=\n4.26 kw.-hr.\nmatter. When mailed by publisher consult the post-\nfect efficiency.\n5.71 h. p.-hr.\nmaster. When mailed by public 1c for each 2 ounces or\n11,315,000 ft.-lb.\nfraction thereof regardless of weight or distance.\n15 lb. of water evap. from and at\nSecond class matter may be registered but cannot be\n212° F.\ninsured or sent C. O.\n.285 kw.-hr.\n.382 h. p.-hr.\nRegistry fee 15c, no indemnity.\n971.7 heat-units.\nReturn receipt, if desired, 3c additional.\n1 water\n104,580 kg.-m.\nThird Class includes circulars, and other matter\nevaporated from =\n1,026,000 joules.\nand at 212° F.\nwholly in print (except second class publications), proof\n756,182 ft.-lb.\nsheets, corrected proof sheets and manuscript accom-\n.06695 of carbon oxidized with per-\nfect efficiency.\npanying same, merchandise (including farm and factory\nHeat\nproducts) and all other mailable matter not included in\nthe first, second, or fourth classes. Weight limit of this\nCentigrade (degrees) = 5/9 (fahrenheit degrees minus 32.)\nclass: 8 ounces, 11/2c for each 2 oz. or fraction thereof.\nFahrenheit (degrees) = 9/5 (centigrade degrees) plus 32.\nCalorie = 3.968 B. t. u.\nOver 8 ounces the fourth class (Parcel Post) rates apply.\nB. t. u. = .252 calorie.\nException. Books, catalogues, seeds, bulbs, roots,\nCalories per kilogram = 1.8 B. t. u. per pound.\ncuttings, scions, and plants (up to 8 oz.), 1 C for 2 oz.\nB. t. u. per pound = .5556 calories per kilogram.\nor fraction thereof.\nCalories per litre = 112.366 B. t. u. per cubic foot.\nB. t. u. per cubic =.00898 calories per litre.\nThird class matter when mailed in bulk shall be 12c\nCalories per cubic meter = 1125 B. t. u. per cubic foot.\nfor each pound or fraction thereof with the exception\nB. t. u. per cubic foot = 8.89 calories per cubic meter.\nnoted above upon which the rates shall be 8c per pound.\n36\n37"
}