Suggestions for Glassware Requests

Demountable Joint Identification. Joints should be drawn and identified as being either an inner (male) or outer (female) section. Size should be identified as well (see Sec. A.2 and Sec. 3.1.1). Ball-and-socket joints should be equally identified (see Fig. A.2 and Sec. 3.1.2). Because O-ring joints do not have inner and outer sections, only their sizes are required (see Fig. A.2 and Sec. 3.1.3). 

Provide the Right Measurements. Give measurements from specified areas that cannot vary. For example, see Fig. A.4(a), where the length of the cold trap s internal tube is ambiguous by the A measurement because C can vary extensively. 

On the other hand, the measurement from the ground area of the joint to the end of the inside tube is specific. The B (or B ) measurement is preferred. 

Provide measurements when a change occurs, such as the seal of one size tubing to another [see Fig. A.4(b)]. The length of the internal tube of the cold trap is ambiguous with the A measurement because the location of B and C can vary extensively. Two preferred measurements would be either B and C, or and D. 

Do Not Make Your Primary Drawing in 3-D. Most of these types of drawings are incomprehensible or confusing, and it is difficult to place measurements on them. An extra sketch in 3-D can sometimes be helpful. 

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