C—lα

Table No. 2. —Comparison of Imperial Standard Steel Tape No. 4 (New Plymouth) with the Head Office, Wellington, Imperial Standard Steel Tape No. 1. Comparator laid down with the Imperial Standard Tape No. 1, using its Balance No. 2. Balance No. 2 also used at the comparisons of Tape No. 4.—2nd July, 1910.

Twenty determinations of the comparator were made, involving 120 readings of the thermometer. Ten of these determinations were made before tin; Imperial standard tape No. 4 was tested, and ten after the test was completed. At the twenty separate tests of the Imperial tape No. 4 scheduled, 120 readings of thermometers were also taken, and when working out the means in both cases double values were given to the certificated thermometers. The standard reference tape for all measurements of the Eltham-Okaiawa base is the Imperial standard steel tape No. 4 deposited in the District Survey Office, New Plymouth, with its certificated balance No. 4. This tape and balance were tested by the Standards Branch of the Board of Trade, London, the tape being certified to as being 0-001 in. longer than Imperial standard at 62° (see page 23, Survey Report for the year 1909-10), or Imperial standard at 61-798° Fahr. Note. —The whole of the work in connection with the above results was carried out under practically perfect conditions of weather, the day being densely cloudy and free from wind, drizzling rain falling at intervals. Comparator was laid down in shelter-tent. Six thermometers in all were used, four being certificated thermometers of the Department, Nos. 263, 264, "265, and 266, the two others being in accord with these, all being distributed along the length of the tape, hanging vertical, and with their bulbs touching same. The certificated thermometers were out of their copper tubes. Observers : R. T. Goulding at the rear end, J. Langmuir reading scale.

APPENDIX IV.

REPORT OF THE SURVEYORS BOARD. The Board, acting in conjunction with the six Australian Surveyors Boards, conducted examinations of candidates for surveyors' licenses in September, 1910, and March, 1911. At the September examination twenty-one candidates sat, and of these Mr. Geoffrey St". Vincent Keddell, Lands and Survey Department, Wellington, passed the examination ; while Mr. Richard Samuel Thompson, Dunedin, Mr. William Moody Gray, Lands and Survey Department, Christchurch, and Mr. Robert Thomson Goulding, Auckland, who had previously passed in some of the subjects, completed their examinations. At the March examination there were eighteen candidates, of whom the following completed their examinations : Mr. Hugh Montgomery Thompson, Lands and Survey Department, Hokitika ; Mr. William Prentice Black, Dunedin ; Mr. John Patrick Larkin, Te Kuiti ; Mr. Robert Mitchell Mclver,

26

No. of Test. Observed Difference from Comparator. True Value of Comparator. Value of Tape at each Test from Columns t(2) and (3). Differences of Tape at each Test, from Imperial Standard 100 links. Differences in Column (5) given in Degrees Fahr. Mean Temperatures at Tests. Degrees Fahr. Temperature at which Tape is Imperial Standard. Sums of (6) and (7). Temperature at which No. 4 New Plymouth Standard Tape is Imperial Standard by the Standards Branch of Board of Tradt. (9.) (1.) (2.) (3.) (4J (5.) (6.) (7.) (8.) 1 2 :s 4 5 6 7 8 9 lo II 12 13 14 If, Iβ IV IS 1(1 2(1 Links. + -0003 + 0003 + -0004 + -0004 + -0004 + -0006 + -00065 + -0006 + -0007 + -0006 + -0007 + -0008 + -0008 + -0007 + -0005 + -0004 + 00035 + -0004 + -00025 + -0003 Links. Links. Links. 99-99438 99-99468 - -00532 99-99438 99-99468 I - 00532 99-99438 99-99478 - -00522 99-99438 99-99478 - -00522 99-99438 99-90478 - -00522 99-99438 99-99498 - -00502 99-99438 99-99503 - -00497 99-99438 99-99498 - -00502 99-99438 99-99508 - -00492 99-99438 99-99498 - 00502 99-99438 '.I9-90508 — -00492 99-99438 99-99518 - -00482 99-99438 99-99518 - -00482 99-99438 99-99508 - -00492 99-99438 99-99488 - -00512 99-99438 99-99478 - -00522 99-99438 99-99473 - -00527 99-99438 99-99478 - 00522 99-99438 99-99463 - -00537 99-99438 99-99468 - -00532 Deg. 8-512 8-512 8-352 8-352 8-352 8032 7-!l.->2 8-032 7-872 8032 7-872 7-712 7-712 7-872 8-192 8-352 8-432 8-352 8-592 8-512 Deg. 5312 53-10 5318 53-31 53-39 53-58 53-60 53-76 53-80 53-82 53-84 53-88 53-85 53-80 53-78 53-74 53-67 53-64 53-58 53-30 Deg. 6J-632 61-612 61-532 61-662 61-742 61-612 61-552 61-792 61-672 61-852 61-712 61-592 61-562 61-672 61-972 62092 62-102 61-992 62-172 61-812 Deg. 61-798 61-798 61-767 20 1235-340 Mean temperature at which No. 4 t> ipe is Imperil al standard .. 61-767 Difference between present test and test by Boar •d of Trade = 0031