VOLUME
19, N O .
2, F E B R U A R Y
1947
15 A
U. S. Patent 2,206,816
LARGE HIGH VACUUM STOPCOCKS M a d e of "PYREX" brand glass Stopcocks need no longer limit the size, speed, or efficiency of your high vacuum pumping systems. Martin extra large, precision stopcocks incorporate improved features in stopcock design, and will meet your most exacting high vacuum requirements. • Exceptionally large and long barrels reduce possibility of leakage. The smallest stopcock listed below is 13^ times the size of illustration. • Plugs are hollow to reduce their mass and facilitate handling. • Heavy wall side arms are tooled heavier where they join the barrel. If unduly strained, arms will break far enough from barrel to permit repair. • Alignment rings tooled on the barrel insure exact register of bore, an exclusive feature covered by Martin patent #2,206,816. • Each stopcock is carefully finished and must pass the most rigid tests for precision. M-30095
Extra Large Hollow P l u g Stopcock, Straight Bore Bore mm. Side arms O.D. mm. Price each
10 18 $15.00
15 26 $25.00
20 32 $35.00
25 38 $45.00
30 46 $65.00
25 38 $50.00
30 46 $72.00
M-30195 Extra Large Hollow Plug Stopcock, Oblique Bore Bore mm. Side arms O.D. mm. Price each
10 18 $16.50
15 26 $27.50
20 32 $38.50
Stopcocks, with one arm connected to a vacuum chamber below plug, may be had in parallel flow or right angle form. Prices same as M-30095.
We also make a most complete line of standard taper stopcocks, laboratory grade or precision stopcocks in conventional or unusual design.
H. S. MARTIN & COMPANY 1916-20 GREENLEAF STREET, EVANSTON, ILLINOIS
