Abstract: A stop lever fixing lever supported at a bed body of a sewing machine has one end to be contacted by a projection of a pattern wheel. A connecting member has one end connected to the other end of the stop lever fixing lever. A first presser bar lifter has one end connected to the other end of the connecting member. A second presser bar lifter has one end defining an operation arm positioned at a lifting position and has a folded projection provided with a hole. A stepped screw having a knurled thumb at the peripheral surface thereof is rotatably inserted in the hole of the folded projection edge with a small diameter screw portion at the tip end thereof. A lever shifting member is screwed into the small diameter screw portion at the folded projection edge. A presser bar lifter cam is disposed along a cutting axis and has a projection.

Abstract: A process is disclosed for the thermal cracking of heavy oil containing nonvaporizable, high-molecular weight hydrocarbone in the presence of steam in one or more thermal cracking tubes or ducts, which process is characterized in that a fluid comprising steam and heavy oil is flowed through a thermal cracking tube such that thermal cracking is carried out under the following conditions:(a) temperature of the fluid in the thermal cracking tube: 800.degree. to 1100.degree. C.(b) pressure of the fluid in the thermal cracking tube: 0 to 50 kg/cm.sup.2 G(c) flow rate or velocity of fluid through the thermal cracking tube: 10 to 100 m/sec, and(d) residence time of the fluid in the thermal cracking tube: at least 0.2 seconds.

Abstract: A hydrogen manufacturing process is carried out by catalytic steam reforming of normally gaseous or liquid hydrocarbons using a catalyst comprising substantially silica-free aluminum oxide at temperatures above 850.degree. C., the catalyst optionally also comprising more than 10 weight percent, preferably more than 20 weight percent, of at least one of the group consisting of beryllium oxide, calcium oxide and strontium oxide.

Abstract: A hydrogen manufacturing process is carried out by catalytic steam reforming of normally gaseous or liquid hydrocarbons using a catalyst comprising substantially silica-free aluminum oxide at temperatures above 850.degree.C., the catalyst optionally also comprising more than 10 weight percent, preferably more than 20 weight percent, of at least one of the group consisting of beryllium oxide, calcium oxide and strontium oxide.