Willgodt T. Odhner invented his very successful “pinwheel” four-function calculator mechanism in Russia in 1874, and his invention was cloned by numerous companies, resulting in dozens of similar models that remained in wide use for almost a century. Numbers are dialed into the sliding levers on the top part of the machine, and are added to the register visible in the carriage at the bottom when the large crank is turned. Shifting the carriage sideways allows multiplication through a sequence of addition operations; the two small cranks zero the registers. The design includes ingenious error-preventing interlocks between all the controls: should the operator fail to return a crank to its resting position, the other controls are frozen until this is corrected. A bell indicates calculations in the negative. Used in Ballarat Institute of Advanced Education (B.I.A.E) Physics department.Black, mechanical calculating machine. Metal. Hand-operated, with three hand-cranks. 10x10 rotor with 13 digit result. Ser. No. 29-286781.5 Black symotape on base front: "PHYSICS". Maker's identification on top surface. Supplier's label (metal, silver & blue) on back: "STOTT & HOARE Pty. Ltd. 171 William St. Melbourne C1 M1991". Stamped on rear panel: "MADE IN SWEDEN". Cast lettering on underside: "M-602 07".calculating machine, pinwheel, calculator, scientific instruments, stott & hoare pty ltd, physics, odhner, ballarat institute of advanced education

Plaque: ‘Hans W Egli/Ingenieur / Fabrikation von flechenmashinen [sic; ?] / Pat. O, Steiger / Zurich II / No 2566. Sole Agents for Australia / Peacock Bros./ Business Systems Company / 558 , 560, 562 Collins St., Melbourne / and at / Sydney, Adelaide, Perth’ Plaque: ‘Presented to . / Department of Information Science / Melbourne University / by the / Gas & Fuel Corporation of Victoria / This calculating machine was used by Engineers of the Metropolitan Gas Co and Gas & Fuel Corporation / from 1917 to 1970’

Liaison Letters details happenings within the various Sections of the Australian Survey Corps to inform all members of current information and practices. 9137.1 Liaison Letter No 1. 21 July 1937. Para 1. Object of Letter. See context section. Para 3. Progress of work. Incomplete, rest of Letter missing only 1 page. 9137.2 Liaison Letter No 2 Letter missing. 9137.3 Liaison Letter No 3. Jan 1937. Para 1. Our thanks are due to the following for articles contributed. .... W/O H. Rossiter. -- "Aerial Surveying". -- Article missing. .... W/O W. M. Sarll. -- "A day in the Draughting Office". -- Report on No 1 Field Sheet, Sale. -- Article missing. .... W/O H. A. Johnson. -- "Semigraphic methods of resection and intersection". -- Article missing. .... Capt. J.J. Raisbeck "Rapid production and reproduction of Military maps". Article missing. .... Lt. L. Fitzgerald. report "Survey Exercise at Sale". Article missing. .... W/O W. M. Sarll. report on No1. Field Sheet, Sale. Article missing. Para 3. Progress of work. .... "No1 Draughting Section". .... Printing. .... No1 Survey Section. .... No2 Survey Section. .... Pages 3 - 6 Missing. .... Article by W/O W. M. Sarll. "A day in the Draughting Office". Pages 7 - 10. 9137.4 Liaison Letter No 4. April 1937. Para 1. Our thanks are due to the following for articles contributed. .... Lieut. H. W. G. Clews. -- Notes on the non-ascertained Base problem. -- Article missing. .... W/O W. M. Sarll. -- Helpful hints on air photos. -- Article missing. .... Capt. T. H. B. Foott. .... & Capt. J.J. Raisbeck. -- A short history of the Military Survey of Australia. -- Article missing. .... W/O H. Rossiter. -- Notes on Aerial Surveying. -- Article missing. .... W/O H. A. Johnson. -- A type of Beacon. -- Article missing. Para 2. Progress of work. ..... No1 Draughting Section. ..... No1 Survey Section. ..... Pages missing. 9137.5 Liaison Letter No 5, July 1937. Para 1. Our thanks are due to the following for articles contributed .... Lt L. Fitzgerald -- A new section and its job. -- Article missing. .... WO G.R.L. Remington. .... & H. E. Eggeling. Azimuth of the Plane table. -- Article missing. .... W.O. B. M. Sarll. -- The Second Annual Smoke Night of the Members of the Aust.Survey Corps stationed in Victoria. .... Also included is a very interesting article on the United States Geological Survey by J. F. Staask, extracted from the Canadian Surveyor. February 1936. -- Article missing. Para 2. Progress of work. .... No1. Draughting Section. .... No 1 Topographical Section. No further articles till page 7. .... The Second Annual Smoke Night of the members of the Aust. Survey Corps. Stationed in Victoria. Pages 7 - 9. 9137.6 Liaison Letter No 6, September 1937. Para 1. Our thanks are due to the following for articles contributed .... Lt L. Fitzgerald. -- Geodetic Triangulation reconnaissance. Article missing. -- Article missing. .... Lt. R.F. Rule, M.M. -- A suggested Form for Field Book 3rd Order Traverses. -- Article missing. .... W/O. H. A. Johnson. -- A suggested Form for Quadrilateral Adjustments. -- Article missing. Para 2. Progress of work. .... No1. Draughting Section. .... No 1 Topographical Section. No further pages to letter 6. 9137.7 Liaison Letter No 7. January 1938. Para 1. Our thanks are due to the following for articles contributed. .... Major T. A. Vance. -- Report on the Survey of a Training Area in Tasmania. -- Article missing. .... W/O D. Macdonald. -- The naming of Trigonometrical Stations. -- Article missing. Para 2. Progress of work. .... No1 Draughting Section A.H.Q. .... No1 Topographical Section, 4 M.D. .... No2 Topographical Section 3 M.D. .... No3 Topographical Section 2 M.D. .... No4 Topographical Section A.H.Q. No further pages to letter 7. 9137.8 Liaison Letter No 8. April 1938. Para 1. Our thanks are due to the following for articles contributed .... Capt. H.P.G.Clews. -- A possible method of estimating Stereoscopic ability. -- Article missing. .... W/O. A.L.Smith. -- Hints to Topographers from a Draughtsman's point of view. .... W/O. W.W. Sarll. -- Seeing that which a Surveyor sees. Para 1.a. -- Relative to article on naming of trig stations which appeared in No7. This contribution has examples of naming. Para 1.d. Enlistment. -- George Gladstone Bolwell was enlisted as W/O.II. Draughtsman in the No. 1 Draughting Section A.H.Q. on the 26th April 1938. Mr. Bolwell was of the Victorian Lands Department. Para 1.e. Embarkation. -- Major T.A. Vance. O.C. Aust Survey Corps, embarked S.S. "Monterey". 28 Mar 1938 to undergo six months training in USA and Canada. Para 1.f. Promotions. -- To be Capt. (prov.) Lieut. H.P.G. Clews 9.11.1937. Para 1.g. Medals -- Award of Aust. Meritorious Service Medal -- W/O.H. Rossiter. .... Award of Aust. Medal for Long Service and Good Conduct -- W/O, A.L. Smith. Para 2. Progress of work. .... No.1 Draughting Section A.H.Q. .... No.1 Topographical Section, 4 M.D. .... No.2 Topographical Section 3 M.D. .... No.3 Topographical Section 2 M.D. .... No.4 Topographical Section A.H.Q. Article missing by Capt. H.P.G.Clews. -- A possible method of estimating Stereoscopic ability. Article by W/O. A.L.Smith. -- Hints to Topographers from a Draughtsman's point of view. Contains 3 pages. Article by W/O. W.W. Sarll. -- Seeing that which a Surveyor sees. Contains 3 pages. 9137.9 Liaison Letter No 9. July 1938. Para 1. Our thanks are due to the following for articles contributed .... Captain H.P.G.Clews -- Computation of log p and log v; also Abbreviated interpolation. .... W/O. G.R.L. Rimington. -- Light Weight Camping Gear. .... W/O. H.A. Johnson. -- The use of the Calculating Machine on Resections, etc,; also comments by O.C.No.4 Topographical Section on this article. Para 1.a. A.A.O. 104. Examination for Appointment to the Rank of Lieutenant. February - March,1938. .... W.O.I. A.L. Smith. .... W.O.I. W.M. Sarll. .... W/O. II. G.R.L. Rimington. .... W/O. II. A.F. Kurrle. .... W/O. II. H.A. Johnson. .... W/O. II. D. MacDonald. .... W/O. II. H.F.Eggeling. .... For Captain. .... Capt. (p) H.P.G. Clews. .... Lieut. L. FitzGerald. .... Lieut. R.K. Rule M.M. Para.1. b. A.A.O. 109. Allotment W/O. II. W.B. Relf to No.3 Topo Section 2 M.D., 5.4.38. Para.1. c. Gaz. No. 37 -- Promotions. -- To be Captain, Lieut. L FitzGerald. 5th July 1938. -- The provisional promotion of Captain H.P.G. Clews is confirmed. Para. 2. Progress of Work. .... No.1 Draughting Section A.H.Q. .... No.1 Topographical Section, 4 M.D. .... No.2 Topographical Section 3 M.D. .... No.3 Topographical Section 2 M.D. .... No.4 Topographical Section 2 M.D. 9137.10 Liaison Letter No 10. October 1938. Para 1. Our thanks are due to the following for articles contributed. .... Lieut. R.K. Rule M.M. -- Barometric levelling in Forest Areas. .... W/O. H.A. Roseblade -- Adjustment of principal points on master grid. .... W/O. II. A.F. Kurrle. -- The Hunter short base applied to photo control. .... W/O. W.B. Relf -- Reunion at Newcastle. .... The articles are all missing Para. 1. a. A.A.O. 184. Discharge -- W/O. II. G.G. Bolwell. 15th July 1938. Para. 1. b. A.A.O. 174-195, 31.8.38. Vacancy for Draughtsman. Para. 1. c. Obituary. -- Major John Lynch. 29th July 1938. Para. 2. Progress of Work. .... No.1 Draughting Section A.H.Q. .... No.1 Topographical Section, 4 M.D. .... No.2 Topographical Section 3 M.D. .... No.3 Topographical Section 2 M.D. .... No.4 Topographical Section A.H.Q. 9137.11 Liaison Letter No 11. January 1939. Para 1. Our thanks are due to the following for articles contributed. .... Major T.A. Vance. -- Training Abroad, Canada and U.S.A. .... Captain L. Fitzgerald -- Air Reconnaissance for 1st Order Triangulation. .... W/O C.E. Stewart. -- Reunion at Traralgon. Para 2. A.A.O. 301/38. .... a. Appointments. -- Royal Ormond Worcester, on enlistment in the Aust Permanent Military Forces is appointed W/O II. 30th November 1938. -- Thomas Micheal Connolly, on enlistment in the Aust Permanent Military Forces is appointed W/O II. 30th November 1938. .... b. Discharge. -- No. 3614 W/O II. G.R.L. Rimington. 30th November 1938. .... c. Awards of the Australian Military Medal for Long Service and Good Conduct (Military). -- No.1175, W/O I, E.T. Johnson. .... d. Return of Officers to Australia. -- Major T.A. Vance, having completed training in the United States of America, Canada and New Zealand, returned to Aust. on the S.S. "Awatea", disembarked Sydney on 3rd December 1938. .... e. Allotment. -- No.3689, W/O. II A.F. Kurrle, allotted to No. 4 Topographical Section, A.H.Q., 1 January 1939. Para. 2. Progress of Work. .... Cartographic Section, A.H.Q. .... Geodetic Section, A.H.Q. .... No.1 Survey Section, 4 M.D. .... No. 2 Survey Section, 3 M.D. .... No. 3 Survey Section, 2 M.D. 9137.12 Liaison Letter No 12. March 1939. Para 1. Our thanks are due to the following for articles contributed. .... W/O H.F. Eggeling -- Topographical Survey and Barometric Levelling. .... W/O G.T.P. Carter Methods of plotting from air photographs. .... Editor, Canadian Surveyor -- The Australian Survey Corps Para 2. A.A.O. 57 -- .... a. Promotion. -- No. 3577 S/Sgt G.T.P. Carter. appointed Topographer promoted to W/O II. 15th January 1939. .... b. Allotment -- The following are allotted to No. 3 Topographical Section 2 M.D. 1st February 1939. .... No, 171 W/O I B. Rossiter. .... No. 178 W/O. I V.W. Aldred. .... No. 150 W/O. I A.T. Smith. .... c. Transfer. -- No. 369 W.O. A.F.Kurrle. to No. 4 Topo Section A.H.Q. 1st January 1939. .... d. Promotions -- To be Major J.J. Raisbeck. and Lieut. W.M. Sarll as of 1st January 1939. Para. 3. Progress of Work. .... Cartographic Section, A.H.Q. .... No.4 Topographical Section, A.H.Q. .... No.2 Topographical Section, 3 M.D. .... No.3 Topographical Section, 2 M.D. .... Articles Missing -- W/O H.F. Eggeling -- Topographical Survey and Barometric Levelling. -- W/O G.T.P. Carter Methods of plotting from air photographs .... Article -- Editor, Extract from "The Canadian Surveyor" -- The Australian Survey Corps. 9137.13 Liaison Letter No 13. June 1939. Para 1. Our thanks are due to the following for articles contributed. .... Lieut. W.M. Sarll -- Meeting a crisis with maps and equipment; also comments by O.C. Cartographic Section. .... W/O H.F. Eggeling -- Design and description of an Epidiascope. -- Article missing. .... Editor, Melbourne Herald -- "They do a Vital Task". 6th July, 1939. .... Also enclosed is a Corps Seniority Roll. -- Article missing. Para 2. a. A.A.O. 118/39. -- Appointment to Lieutenant, February, March, 1939. .... 3572 W/O. I. H.C. Raisbeck. .... 3684 W/O. I.I. T.R. Westgarth. .... 3686 W/O. I.I. C.E.B. Stewart. .... 3702 W/O. I.I. C. S. Tyler. .... 4479 W/O. I.I. W.B. Relf. Para. 2. b. A.A.O. 127/39 -- Appointment to W/O. I.I. .... G. V. Brooke. 5.4.39. .... L. J. Lockwood. 5.4.39. .... J. P. Hanley. 17.4.39. .... W. J. Harrison. 24.4.39. .... J. K. C. Herridge. 1.5.39. Para 2. c Gaz. 26/39. Awards of the Aust. Medal for Long Service and Good Conduct Military. .... No. 1439 W/O. I. H. A. Roseblade. .... No. 1176 W/O. I. J. Cullen. Para. 3. Progress of Work. .... Cartographic Section, A.H.Q. .... Geodetic Section A.H.Q. .... No. 2 Survey Section, 3 M.D. .... No. 3 Survey Section, 2 M.D. .... Editor, Melbourne Herald -- "They do a Vital Task". 6th July, 1939. .... Lieut. W.M. Sarll -- Meeting a crisis with maps and equipment; also comments by O.C. Cartographic Section. 9137.1 Liaison Letter No 1. 21 July 1937. Para 1. Object of Letter. The object of these letters, which it is to be proposed quarterly, is to enable members of the Australian Survey Corps to stimulate interest in the progress of the work as a whole. It is also intended as a means to invite helpful criticism and suggestions for improvements in methods in any branch of the work. All members of the Corps are invited to contribute. Their suggestion should be forwarded to the O.C. section for transmission to O, C. Survey Corps and, if considered of sufficient merit, will be included in the next letter. It may often happen that a method, that may appear obvious and of little consequence to a member or Section using it, may not be followed by the others. In any case a discussion of detail in methods should be helpful to all.54 x A4 Photocopied pages of typed text. 9137.1 Liaison Letter No 1. 21 July 1937. 9137.2 Liaison Letter No 2 Letter missing. 9137.3 Liaison Letter No 3. Jan 1937. 9137.4 Liaison Letter No 4. April 1937. 9137.5 Liaison Letter No 5, July 1937. 9137.6 Liaison Letter No 6, September 1937. 9137.7 Liaison Letter No 7. January 1938. 9137.8 Liaison Letter No 8. April 1938. 9137.9 Liaison Letter No 9. July 1938. 9137.10 Liaison Letter No 10. October 1938. 9137.11 Liaison Letter No 11. January 1939. 9137.12 Liaison Letter No 12. March 1939. 9137.13 Liaison Letter No 13. June 1939. royal australian survey corps, army survey regiment, fortuna, rasvy, army svy regt, asr