niagara falls n y the sessile drop apparatus is essentially a horizontal induction heating furnace consisting of a fused silica tube 38 mm in diameter and 300 mm long in which a vacuum of 5 u00d7 10 5 mm hg and temperatures to 1750 u00b0 c can be obtained after each run was made the sample was removed from the tube examined with a shadowgraph to measure the degree of wetting contact angle and then either sectioned for ceramographic examination or used for determination of the apparent shear strength of the bond between the drop and the ceramic substrate the shear tests were conducted by a generally accepted method the sutton push off technique in this test a projection on a special test fixture shears the solidified sessile drop off the ceramic substrate the bond strength was calculated from the load at failure divided by the interfacial area flexural strength measurements were also conducted on ceramic ceramic brazements made with these experimental brazing filler metals typically three or four bar shaped specimens containing a braze joint across the middle are tested in a four point bend fixture the filler metals studied have been made by either arc melting and drop casting into a water cooled copper mold or by melt spinning onto a rapidly rotating stainless steel wheel the drop cast material was either cut into small pieces or rolled into foil for brazing although brazing was done in vacuum ranging from 2.