Abstract: Temperature in the vicinity of a heated point on a work (1) surface on a moving locus of flame poured from a torch (3) is measured, the measured value is inputted into a controlling unit (8). It is converted into a physical quantity which appeals to the perception of a worker, such as light, sound, or vibration, and outputted to warning means (5, 9, and 10). The measured value is compared with a predetermined standard temperature range, and as the measured value approaches the upper limit or the lower limit of the standard temperature range, the physical quantity produced as warning signal is stepwise changed. This permits the worker to perceive the change in the measured value, and to easily change the position of the torch or the moving speed thereof so that the temperature at the heated point is maintained within the standard temperature range.

Abstract: A spindle structure for a machine tool such as a boring machine, for example, includes a rotatable tubular shaft to be coupled to a rotative drive source, and a spindle axially slidably disposed in the tubular shaft and rotatable in unison with the tubular shaft. Bushings with powder on WC-base cemented carbide thermally sprayed on inner peripheral surfaces thereof are disposed between the tubular shaft and the spindle to prevent fretting corrosion. The WC-base cemented carbide comprises 12.about.18 wt % of Co, 4.about.6 wt % of C, 0.1.about.1.2 wt % of Fe, and 75.about.84 wt % of W.

Abstract: An electrical contact is provided for receiving a pin contact therein. It includes a receptacle having an elongate spring member positioned therein. A pair of resilient tabs having downwardly projecting contact points define the upper portion of the receptacle. The elongate spring member includes a pair of upwardly extending contact points. A pin contact is inserted between the tabs and the spring member. A projection extending from a side wall of the receptacle limits the deflection of the spring member upon insertion of the pin contact. A plurality of electrical contacts as described above may be incorporated within an insulator to provide a connector.