Circular of the Bureau of Standards, Issues 426-451U.S. Government Printing Office, 1940 |
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Page 16 - The neck shall be cylindrical for at least 5 mm. below the lowest and above the highest graduation mark. The top of the neck shall be flared to a diameter of not less than 10 mm.
Page 16 - The shape of the bulb may be either cylindrical or conical with the smallest diameter at the bottom. If cylindrical, the outside diameter shall be between 34 and 36...
Page 22 - It will be noted that the number of seconds sounded immediately following the single second omission and preceding the long omission at the end of each minute indicates the number of minutes of the signal yet to be sent. For instance, the signal for 56 minutes and 52 seconds is omitted and then 3 seconds are sounded, indicating that 3 minutes of the signal remain to be transmitted.
Page 11 - The distance between the extreme graduations must not exceed 65 cm on burettes nor 35 cm on measuring pipettes. The rate of outflow of burettes and measuring pipettes must be restricted by the size of the tip and for any graduated interval the time of free outflow must not be more than three minutes nor less than the following for the respective lengths: The upper end of any measuring pipette must be not less than 10 cm from the uppermost mark and the lower end not less than 4 cm from the lowest...
Page 16 - The charge of the bottle shall be 9 grams. All bottles shall bear on top of the neck above the graduations in plainly legible characters, a mark defining the weight of the charge to be used (9 grams).
Page 15 - The internal neck diameter shall be not less than 11.5 mm and not more than 12.5 mm. The upper end of the neck shall be flared and the graduation mark shall be not less than 30 mm from the upper end and 15 mm from the lower end of the neck.
Page 1 - ... secure the desired capacities in convenient lengths. The graduations should be of uniform width, continuous, and finely but distinctly etched, and must be perpendicular to the axis and parallel to the base of the apparatus. All graduations must extend at least halfway around ; and on subdivided apparatus at least every tenth mark, and on undivided apparatus all marks, must extend completely around the circumference.
Page 1 - Design and workmanship. — The cross section must be circular and the shape must permit of complete emptying and drainage. Instruments having a base or foot must stand solidly on a level surface, and the base must be of such size that the instruments will stand on a plane inclined at 15°. Stoppers and stopcocks must be so ground as to work easily and prevent leakage. The parts on which graduations are placed must be cylindrical for at least 1 cm on each side of ever)' mark, but elsewhere may be...
Page 15 - Graduation — The total per cent graduation shall be 50. The graduated portion of the neck shall have a length of not less than 63 mm.