202.405d 202.405e Invar 50-m base-line tape high-precision calibration of a group of Invar 50-m base-line tape-determination on the geodetic comparator (*) (*) 202.405g (*) 202.405h Spring balance-testing in horizontal position....... (*) 202.405i Invar base-line tape-additional charge for each tape sent without a (*) 202.405k Invar base-line tape-computed values other than as provided in 202.4051 202.405m 202.405z Invar base-line tape not more than 50 m in nominal length-determi- For special tests not covered by the above schedule, fees will be (*) (*) (*) *For current fees, see Appendix C. 202.406 Surveyors' measuring instruments (other than tapes). For special tests not covered by the above schedule, fee will be *For current fees, see Appendix C. NOTE: The precision seal of the National Bureau of Standards on any sieve indicates that the sieve has been tested at the Bureau and found to conform to specification. Except by special arrangements, the testing of sieves at the Bureau is limited to No. 31⁄2 to No. 400 inclusive. Item Description Fee 202.407a Sieve-test of a sieve No. 31⁄2 to No. 400 inclusive to determine con- (*) 202.407z For special tests not covered by the above schedule, fees will be *For current fees, see Appendix C. 202.408 Haemacytometers. Each haemacytometer chamber and each cover glass which passes the specification is marked with a National Bureau of Standards precision seal. In general, work will be discontinued when a substantial number of items in a lot fail to comply with the specifications, and the fee will be computed on the basis of the number of items tested plus a special handling charge. Items 202.408 a to e inclusive will be applicable if a minimum of 12 chambers are submitted at one time; otherwise item 202.408z will be applicable. Only one letter reporting results of test will be supplied for any one test at the prices of item 202.408 a to e inclusive. Item Description Fee 202.408a Single Neubauer haemacytometer chamber-testing single cell cham- (*) 202.408b Single Fuchs-Rosenthal haemacytometer chamber-testing single cell (*) 202.408c Double Neubauer haemacytometer chamber-testing double cell (*) 202.408d Double Fuchs-Rosenthal haemacytometer chamber-testing double (*) 202.408e Quadruple haemacytometer chamber-testing quadruple cell chamber (*) 202.408z For special tests not covered by the above schedule, fees will be *For current fees, see Appendix C. 202.410z Special tests only are conducted in this category and fees will be Fee Fee 202.411z Special tests only are conducted in this category and fees for accepted 202.412 Gage blocks. (a) Test fee schedules in 202.412 include a statement of the accuracy to which measurements are ordinarily made; however, if the character of the defining surfaces of a gage block is not such as to warrant this accuracy, the report will show the accuracy actually obtained. All gage blocks submitted for test should be in substantially new block condition and each block should be marked with an identification number. (b) In the shipment of gage blocks extreme precaution should be taken against both corrosion and damage by contact with other gage blocks during transit. All defining steel surfaces should be greased and the blocks padded with waxed paper or volatile rust inhibitor treated paper. A greased steel surface coming in contact with newspaper, wrapping paper (unwaxed), or excelsior is very likely to corrode. Sets of gage blocks should have packing inside the case, and the case should be bound shut as the clasps frequently open or break during shipment. (c) Shipments and purchase orders should be sent to the National Bureau of Standards, Washington, D.C., 20234, marked to the attention of the Length Section. Item Description Fee 202.412a Gage blocks-determination of length to +0.000004 in. and excessive (*) 202.412b Actual cost of calibration will be charged for smaller lots. Actual cost of calibration will be charged for smaller lots. See footnote at end of table. 202.412ab 202.412c Measurements as described under items (a) and (b) for usual 81- Extra blocks will be charged for under items (a) or (e). Gage blocks-determination of length to ±0.000002 in. and excessive € (*) Actual cost of calibration will be charged for smaller lots. 202.412d Gage blocks-determination of length to +0.000002, 0.000003, 0.000004 in. respectively, for blocks from 1 to 2 in., 2 to 3 in., and 3 to 4 in. in length, and excessive errors in flatness and parallelism, in lots of three or more, each. (*) Actual cost of calibration will be charged for smaller lots. 202.412cd Measurements as described under items (c) and (d) for usual 81- (*) Extra blocks will be charged for under items (c) or (e). 202.412e Gage blocks-determination of length to +0.000003 in. and excessive (*) 202.412f 202.412z Blocks in this size range are usually warped and do not warrant calibration to a higher accuracy. In special cases blocks 0.040 in. and thicker will be calibrated under item (c) if the errors in flatness of the blocks are not excessive. Gage blocks determination of length to 0.000001 in. per inch of Actual cost of calibration will be charged for smaller lots. For special tests not covered by the above schedule, fees will be (*) (a) Test fee schedules 202.501 to 202.509 include a statement of the relative accuracy to which measurements are ordinarily made. However, if the character of the defining surface of a gage or other article is not such as to warrant the measurement to this accuracy, the report will show the accuracy actually obtained. If a greater accuracy is requested and the defining surfaces are such as to permit measurements to the accuracy requested, the necessary measurements will be made and a special fee will be charged. (b) In addition to the items covered by schedules 202.501 to 202.509 other items such as gage block accessories, taper plug and ring gages, and gill net gages are occasionally calibrated. Sizes other than those listed in the fee schedules are also calibrated on special request. These tests and calibrations are made so infrequently that it is not practical to list a definite fee, and such work will be done on the basis of the cost of the work. (c) In the shipment of gages, extreme precautions should be taken against both corrosion and damage by contact with other gages during transit. All defining steal surfaces should be greased and protected with waxed paper or a suitable plastic coating. A greased steel surface coming in contact with newspaper, wrapping paper (unwaxed), or excelsior is very likely to corrode. Small gages suitably wrapped may be fastened in place in a strong rigid container so that no movement is possible. Plug and ring gages should ordinarily not be shipped mated. In the case of large-size threaded plugs and rings, however, mating is permissible as a means of protecting the plug threads. In such cases a grease must be used that will prevent electrolytic corrosion between the mating gages. (d) Minimum test fee for calibration work is $20.00. 202.501 Item End standards of length. Description Fee End standards with spherical or pointed ends, or flat ends with area 202.501a Determination of length to ±0.00005 in. for lengths up to and in- (*) 202.501b Determination of length to ±0.000005 in. per inch of length for (*) 202.501c Determination of length to +0.000005 in. per inch of length for (*) 202.501d Determination of length to ±0.000005 in. per inch of length for (*) 202.501e Determination of length to ±0.00002 in. for lengths up to and in- (*) 202.501f Determination of length to ±0.000003 in. per inch of length for (*) 202.501g Determination of length to ±0.000003 in. per inch of length for (*) 202.501h Determination of length to ±0.000003 in. per inch of length for (*) 202.501z For special tests not covered by the above schedule, fees will be *For current fees, see Appendix C. |